{"id":4918,"date":"2025-12-23T08:10:25","date_gmt":"2025-12-23T08:10:25","guid":{"rendered":"https:\/\/murreeroad.org\/?p=4918"},"modified":"2025-12-23T08:18:20","modified_gmt":"2025-12-23T08:18:20","slug":"ecology-mcqs-with-answers-100-multiple-choice-questions","status":"publish","type":"post","link":"https:\/\/learn-nest.murreeroad.org\/blog\/ecology-mcqs-with-answers-100-multiple-choice-questions\/","title":{"rendered":"Ecology MCQs with Answers \u2013 100 Multiple Choice Questions"},"content":{"rendered":"<p>Practice 100 Ecology MCQs with answers covering ecosystems, food chains, biodiversity, ecological succession, and environmental conservation. Ideal for students and competitive exams.<\/p>\n<p>Ecology is a vital branch of biology that studies the relationships between living organisms and their environment, highlighting how ecosystems function and remain balanced. Understanding ecological concepts such as ecosystems, food chains, food webs, energy flow, biodiversity, ecological succession, and environmental conservation is essential for biology students and competitive exam aspirants. This article offers <strong data-start=\"512\" data-end=\"561\">100 well-structured Ecology <a href=\"https:\/\/murreeroad.org\/category\/mcqs\/\">MCQs<\/a> with answers<\/strong>, designed to strengthen core concepts, support quick revision, and enhance exam performance. These <strong data-start=\"661\" data-end=\"698\">ecology <a href=\"https:\/\/studentnotes.murreeroad.org\/\" target=\"_blank\" rel=\"noopener\">multiple choice questions<\/a><\/strong> are ideal for school exams, entrance tests, and general science preparation.<\/p>\n<p data-start=\"0\" data-end=\"150\">Below are <strong data-start=\"16\" data-end=\"39\">100 <a href=\"https:\/\/murreeroad.org\/category\/mcqs\/\">MCQs<\/a> on Ecology<\/strong>, written in clear and correct <a href=\"https:\/\/studentnotes.murreeroad.org\/english\/?_gl=1*1ex3ko*_ga*MjEzMzkxMjMwOC4xNzY2NDI3MTMw*_ga_L8BW7PJ29P*czE3NjY0NzY5MDgkbzIkZzEkdDE3NjY0NzY5ODYkajYwJGwwJGgw\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"70\" data-end=\"81\">English<\/strong><\/a>, suitable for school exams, competitive exams, and <a href=\"https:\/\/studentnotes.murreeroad.org\/biology10-mcqs\/\" target=\"_blank\" rel=\"noopener\">biology<\/a> practice.<\/p>\n<hr data-start=\"152\" data-end=\"155\" \/>\n<h2 data-start=\"157\" data-end=\"222\">\ud83c\udf0d Ecology \u2013 100 Multiple Choice Questions (MCQs) with Answers<\/h2>\n<h3 data-start=\"224\" data-end=\"255\">1. Ecology is the study of:<\/h3>\n<p data-start=\"256\" data-end=\"371\">A. Plants only<br data-start=\"270\" data-end=\"273\" \/>B. Animals only<br data-start=\"288\" data-end=\"291\" \/>C. Living organisms and their environment<br data-start=\"332\" data-end=\"335\" \/>D. Non-living things<br data-start=\"355\" data-end=\"358\" \/><strong data-start=\"358\" data-end=\"371\">Answer: C<\/strong><\/p>\n<h3 data-start=\"373\" data-end=\"413\">2. The term \u201cEcology\u201d was coined by:<\/h3>\n<p data-start=\"414\" data-end=\"478\">A. Darwin<br data-start=\"423\" data-end=\"426\" \/>B. Mendel<br data-start=\"435\" data-end=\"438\" \/>C. Haeckel<br data-start=\"448\" data-end=\"451\" \/>D. Linnaeus<br data-start=\"462\" data-end=\"465\" \/><strong data-start=\"465\" data-end=\"478\">Answer: C<\/strong><\/p>\n<h3 data-start=\"480\" data-end=\"531\">3. The place where an organism lives is called:<\/h3>\n<p data-start=\"532\" data-end=\"600\">A. Niche<br data-start=\"540\" data-end=\"543\" \/>B. Habitat<br data-start=\"553\" data-end=\"556\" \/>C. Community<br data-start=\"568\" data-end=\"571\" \/>D. Population<br data-start=\"584\" data-end=\"587\" \/><strong data-start=\"587\" data-end=\"600\">Answer: B<\/strong><\/p>\n<h3 data-start=\"602\" data-end=\"662\">4. A group of individuals of the same species is called:<\/h3>\n<p data-start=\"663\" data-end=\"733\">A. Ecosystem<br data-start=\"675\" data-end=\"678\" \/>B. Community<br data-start=\"690\" data-end=\"693\" \/>C. Population<br data-start=\"706\" data-end=\"709\" \/>D. Biome<br data-start=\"717\" data-end=\"720\" \/><strong data-start=\"720\" data-end=\"733\">Answer: C<\/strong><\/p>\n<h3 data-start=\"735\" data-end=\"763\">5. A community includes:<\/h3>\n<p data-start=\"764\" data-end=\"856\">A. Only plants<br data-start=\"778\" data-end=\"781\" \/>B. Only animals<br data-start=\"796\" data-end=\"799\" \/>C. One species<br data-start=\"813\" data-end=\"816\" \/>D. Different populations<br data-start=\"840\" data-end=\"843\" \/><strong data-start=\"843\" data-end=\"856\">Answer: D<\/strong><\/p>\n<hr data-start=\"858\" data-end=\"861\" \/>\n<h3 data-start=\"863\" data-end=\"892\">6. An ecosystem includes:<\/h3>\n<p data-start=\"893\" data-end=\"1023\">A. Only living organisms<br data-start=\"917\" data-end=\"920\" \/>B. Only non-living components<br data-start=\"949\" data-end=\"952\" \/>C. Living and non-living components<br data-start=\"987\" data-end=\"990\" \/>D. Only producers<br data-start=\"1007\" data-end=\"1010\" \/><strong data-start=\"1010\" data-end=\"1023\">Answer: C<\/strong><\/p>\n<h3 data-start=\"1025\" data-end=\"1074\">7. Which of the following is a biotic factor?<\/h3>\n<p data-start=\"1075\" data-end=\"1141\">A. Light<br data-start=\"1083\" data-end=\"1086\" \/>B. Water<br data-start=\"1094\" data-end=\"1097\" \/>C. Temperature<br data-start=\"1111\" data-end=\"1114\" \/>D. Bacteria<br data-start=\"1125\" data-end=\"1128\" \/><strong data-start=\"1128\" data-end=\"1141\">Answer: D<\/strong><\/p>\n<h3 data-start=\"1143\" data-end=\"1194\">8. Which of the following is an abiotic factor?<\/h3>\n<p data-start=\"1195\" data-end=\"1261\">A. Fungi<br data-start=\"1203\" data-end=\"1206\" \/>B. Animals<br data-start=\"1216\" data-end=\"1219\" \/>C. Temperature<br data-start=\"1233\" data-end=\"1236\" \/>D. Plants<br data-start=\"1245\" data-end=\"1248\" \/><strong data-start=\"1248\" data-end=\"1261\">Answer: C<\/strong><\/p>\n<h3 data-start=\"1263\" data-end=\"1296\">9. Producers are also called:<\/h3>\n<p data-start=\"1297\" data-end=\"1376\">A. Consumers<br data-start=\"1309\" data-end=\"1312\" \/>B. Decomposers<br data-start=\"1326\" data-end=\"1329\" \/>C. Autotrophs<br data-start=\"1342\" data-end=\"1345\" \/>D. Heterotrophs<br data-start=\"1360\" data-end=\"1363\" \/><strong data-start=\"1363\" data-end=\"1376\">Answer: C<\/strong><\/p>\n<h3 data-start=\"1378\" data-end=\"1425\">10. Which organisms prepare their own food?<\/h3>\n<p data-start=\"1426\" data-end=\"1502\">A. Consumers<br data-start=\"1438\" data-end=\"1441\" \/>B. Decomposers<br data-start=\"1455\" data-end=\"1458\" \/>C. Autotrophs<br data-start=\"1471\" data-end=\"1474\" \/>D. Parasites<br data-start=\"1486\" data-end=\"1489\" \/><strong data-start=\"1489\" data-end=\"1502\">Answer: C<\/strong><\/p>\n<hr data-start=\"1504\" data-end=\"1507\" \/>\n<h3 data-start=\"1509\" data-end=\"1532\">11. Herbivores are:<\/h3>\n<p data-start=\"1533\" data-end=\"1646\">A. Plant-eating animals<br data-start=\"1556\" data-end=\"1559\" \/>B. Meat-eating animals<br data-start=\"1581\" data-end=\"1584\" \/>C. Both plant and meat eaters<br data-start=\"1613\" data-end=\"1616\" \/>D. Decomposers<br data-start=\"1630\" data-end=\"1633\" \/><strong data-start=\"1633\" data-end=\"1646\">Answer: A<\/strong><\/p>\n<h3 data-start=\"1648\" data-end=\"1671\">12. Carnivores are:<\/h3>\n<p data-start=\"1672\" data-end=\"1750\">A. Plant eaters<br data-start=\"1687\" data-end=\"1690\" \/>B. Meat eaters<br data-start=\"1704\" data-end=\"1707\" \/>C. Omnivores<br data-start=\"1719\" data-end=\"1722\" \/>D. Producers<br data-start=\"1734\" data-end=\"1737\" \/><strong data-start=\"1737\" data-end=\"1750\">Answer: B<\/strong><\/p>\n<h3 data-start=\"1752\" data-end=\"1774\">13. Omnivores eat:<\/h3>\n<p data-start=\"1775\" data-end=\"1877\">A. Plants only<br data-start=\"1789\" data-end=\"1792\" \/>B. Animals only<br data-start=\"1807\" data-end=\"1810\" \/>C. Both plants and animals<br data-start=\"1836\" data-end=\"1839\" \/>D. Dead organisms only<br data-start=\"1861\" data-end=\"1864\" \/><strong data-start=\"1864\" data-end=\"1877\">Answer: C<\/strong><\/p>\n<h3 data-start=\"1879\" data-end=\"1914\">14. Decomposers mainly include:<\/h3>\n<p data-start=\"1915\" data-end=\"1990\">A. Plants<br data-start=\"1924\" data-end=\"1927\" \/>B. Animals<br data-start=\"1937\" data-end=\"1940\" \/>C. Bacteria and fungi<br data-start=\"1961\" data-end=\"1964\" \/>D. Insects<br data-start=\"1974\" data-end=\"1977\" \/><strong data-start=\"1977\" data-end=\"1990\">Answer: C<\/strong><\/p>\n<h3 data-start=\"1992\" data-end=\"2020\">15. Decomposers help in:<\/h3>\n<p data-start=\"2021\" data-end=\"2125\">A. Energy production<br data-start=\"2041\" data-end=\"2044\" \/>B. Recycling nutrients<br data-start=\"2066\" data-end=\"2069\" \/>C. Photosynthesis<br data-start=\"2086\" data-end=\"2089\" \/>D. Population growth<br data-start=\"2109\" data-end=\"2112\" \/><strong data-start=\"2112\" data-end=\"2125\">Answer: B<\/strong><\/p>\n<hr data-start=\"2127\" data-end=\"2130\" \/>\n<h3 data-start=\"2132\" data-end=\"2159\">16. A food chain shows:<\/h3>\n<p data-start=\"2160\" data-end=\"2245\">A. Energy flow<br data-start=\"2174\" data-end=\"2177\" \/>B. Water cycle<br data-start=\"2191\" data-end=\"2194\" \/>C. Nitrogen cycle<br data-start=\"2211\" data-end=\"2214\" \/>D. Oxygen cycle<br data-start=\"2229\" data-end=\"2232\" \/><strong data-start=\"2232\" data-end=\"2245\">Answer: A<\/strong><\/p>\n<h3 data-start=\"2247\" data-end=\"2294\">17. The first trophic level is occupied by:<\/h3>\n<p data-start=\"2295\" data-end=\"2372\">A. Herbivores<br data-start=\"2308\" data-end=\"2311\" \/>B. Carnivores<br data-start=\"2324\" data-end=\"2327\" \/>C. Producers<br data-start=\"2339\" data-end=\"2342\" \/>D. Decomposers<br data-start=\"2356\" data-end=\"2359\" \/><strong data-start=\"2359\" data-end=\"2372\">Answer: C<\/strong><\/p>\n<h3 data-start=\"2374\" data-end=\"2419\">18. The second trophic level consists of:<\/h3>\n<p data-start=\"2420\" data-end=\"2513\">A. Producers<br data-start=\"2432\" data-end=\"2435\" \/>B. Primary consumers<br data-start=\"2455\" data-end=\"2458\" \/>C. Secondary consumers<br data-start=\"2480\" data-end=\"2483\" \/>D. Decomposers<br data-start=\"2497\" data-end=\"2500\" \/><strong data-start=\"2500\" data-end=\"2513\">Answer: B<\/strong><\/p>\n<h3 data-start=\"2515\" data-end=\"2537\">19. Food webs are:<\/h3>\n<p data-start=\"2538\" data-end=\"2633\">A. Single food chains<br data-start=\"2559\" data-end=\"2562\" \/>B. Interconnected food chains<br data-start=\"2591\" data-end=\"2594\" \/>C. Cycles<br data-start=\"2603\" data-end=\"2606\" \/>D. Pyramids<br data-start=\"2617\" data-end=\"2620\" \/><strong data-start=\"2620\" data-end=\"2633\">Answer: B<\/strong><\/p>\n<h3 data-start=\"2635\" data-end=\"2685\">20. Energy transfer between trophic levels is:<\/h3>\n<p data-start=\"2686\" data-end=\"2736\">A. 100%<br data-start=\"2693\" data-end=\"2696\" \/>B. 50%<br data-start=\"2702\" data-end=\"2705\" \/>C. 10%<br data-start=\"2711\" data-end=\"2714\" \/>D. 90%<br data-start=\"2720\" data-end=\"2723\" \/><strong data-start=\"2723\" data-end=\"2736\">Answer: C<\/strong><\/p>\n<hr data-start=\"2738\" data-end=\"2741\" \/>\n<h3 data-start=\"2743\" data-end=\"2779\">21. The 10% law was proposed by:<\/h3>\n<p data-start=\"2780\" data-end=\"2844\">A. Darwin<br data-start=\"2789\" data-end=\"2792\" \/>B. Lindeman<br data-start=\"2803\" data-end=\"2806\" \/>C. Mendel<br data-start=\"2815\" data-end=\"2818\" \/>D. Haeckel<br data-start=\"2828\" data-end=\"2831\" \/><strong data-start=\"2831\" data-end=\"2844\">Answer: B<\/strong><\/p>\n<h3 data-start=\"2846\" data-end=\"2884\">22. Ecological pyramids represent:<\/h3>\n<p data-start=\"2885\" data-end=\"2981\">A. Number, biomass, or energy<br data-start=\"2914\" data-end=\"2917\" \/>B. Population only<br data-start=\"2935\" data-end=\"2938\" \/>C. Habitat only<br data-start=\"2953\" data-end=\"2956\" \/>D. Biomes<br data-start=\"2965\" data-end=\"2968\" \/><strong data-start=\"2968\" data-end=\"2981\">Answer: A<\/strong><\/p>\n<h3 data-start=\"2983\" data-end=\"3019\">23. Pyramid of energy is always:<\/h3>\n<p data-start=\"3020\" data-end=\"3095\">A. Inverted<br data-start=\"3031\" data-end=\"3034\" \/>B. Upright<br data-start=\"3044\" data-end=\"3047\" \/>C. Spindle-shaped<br data-start=\"3064\" data-end=\"3067\" \/>D. Irregular<br data-start=\"3079\" data-end=\"3082\" \/><strong data-start=\"3082\" data-end=\"3095\">Answer: B<\/strong><\/p>\n<h3 data-start=\"3097\" data-end=\"3143\">24. Pyramid of biomass may be inverted in:<\/h3>\n<p data-start=\"3144\" data-end=\"3249\">A. Forest ecosystem<br data-start=\"3163\" data-end=\"3166\" \/>B. Grassland ecosystem<br data-start=\"3188\" data-end=\"3191\" \/>C. Aquatic ecosystem<br data-start=\"3211\" data-end=\"3214\" \/>D. Desert ecosystem<br data-start=\"3233\" data-end=\"3236\" \/><strong data-start=\"3236\" data-end=\"3249\">Answer: C<\/strong><\/p>\n<h3 data-start=\"3251\" data-end=\"3284\">25. Pyramid of numbers shows:<\/h3>\n<p data-start=\"3285\" data-end=\"3373\">A. Energy flow<br data-start=\"3299\" data-end=\"3302\" \/>B. Biomass<br data-start=\"3312\" data-end=\"3315\" \/>C. Number of organisms<br data-start=\"3337\" data-end=\"3340\" \/>D. Nutrient cycle<br data-start=\"3357\" data-end=\"3360\" \/><strong data-start=\"3360\" data-end=\"3373\">Answer: C<\/strong><\/p>\n<hr data-start=\"3375\" data-end=\"3378\" \/>\n<h3 data-start=\"3380\" data-end=\"3419\">26. Primary productivity refers to:<\/h3>\n<p data-start=\"3420\" data-end=\"3555\">A. Energy used by consumers<br data-start=\"3447\" data-end=\"3450\" \/>B. Rate of biomass production by producers<br data-start=\"3492\" data-end=\"3495\" \/>C. Decomposition rate<br data-start=\"3516\" data-end=\"3519\" \/>D. Population growth<br data-start=\"3539\" data-end=\"3542\" \/><strong data-start=\"3542\" data-end=\"3555\">Answer: B<\/strong><\/p>\n<h3 data-start=\"3557\" data-end=\"3601\">27. Gross Primary Productivity (GPP) is:<\/h3>\n<p data-start=\"3602\" data-end=\"3713\">A. Total energy captured<br data-start=\"3626\" data-end=\"3629\" \/>B. Energy used in respiration<br data-start=\"3658\" data-end=\"3661\" \/>C. Net productivity<br data-start=\"3680\" data-end=\"3683\" \/>D. Energy lost<br data-start=\"3697\" data-end=\"3700\" \/><strong data-start=\"3700\" data-end=\"3713\">Answer: A<\/strong><\/p>\n<h3 data-start=\"3715\" data-end=\"3757\">28. Net Primary Productivity (NPP) is:<\/h3>\n<p data-start=\"3758\" data-end=\"3857\">A. GPP + respiration<br data-start=\"3778\" data-end=\"3781\" \/>B. GPP \u2013 respiration<br data-start=\"3801\" data-end=\"3804\" \/>C. Respiration \u2013 GPP<br data-start=\"3824\" data-end=\"3827\" \/>D. Energy lost<br data-start=\"3841\" data-end=\"3844\" \/><strong data-start=\"3844\" data-end=\"3857\">Answer: B<\/strong><\/p>\n<h3 data-start=\"3859\" data-end=\"3912\">29. Which ecosystem has the highest productivity?<\/h3>\n<p data-start=\"3913\" data-end=\"3990\">A. Desert<br data-start=\"3922\" data-end=\"3925\" \/>B. Grassland<br data-start=\"3937\" data-end=\"3940\" \/>C. Tropical rainforest<br data-start=\"3962\" data-end=\"3965\" \/>D. Tundra<br data-start=\"3974\" data-end=\"3977\" \/><strong data-start=\"3977\" data-end=\"3990\">Answer: C<\/strong><\/p>\n<h3 data-start=\"3992\" data-end=\"4034\">30. The largest ecosystem on Earth is:<\/h3>\n<p data-start=\"4035\" data-end=\"4098\">A. Forest<br data-start=\"4044\" data-end=\"4047\" \/>B. Grassland<br data-start=\"4059\" data-end=\"4062\" \/>C. Ocean<br data-start=\"4070\" data-end=\"4073\" \/>D. Desert<br data-start=\"4082\" data-end=\"4085\" \/><strong data-start=\"4085\" data-end=\"4098\">Answer: C<\/strong><\/p>\n<hr data-start=\"4100\" data-end=\"4103\" \/>\n<h3 data-start=\"4105\" data-end=\"4155\">31. Biomes are large regions characterized by:<\/h3>\n<p data-start=\"4156\" data-end=\"4246\">A. Climate and vegetation<br data-start=\"4181\" data-end=\"4184\" \/>B. Animals only<br data-start=\"4199\" data-end=\"4202\" \/>C. Soil only<br data-start=\"4214\" data-end=\"4217\" \/>D. Water only<br data-start=\"4230\" data-end=\"4233\" \/><strong data-start=\"4233\" data-end=\"4246\">Answer: A<\/strong><\/p>\n<h3 data-start=\"4248\" data-end=\"4290\">32. Which biome has very low rainfall?<\/h3>\n<p data-start=\"4291\" data-end=\"4355\">A. Forest<br data-start=\"4300\" data-end=\"4303\" \/>B. Desert<br data-start=\"4312\" data-end=\"4315\" \/>C. Grassland<br data-start=\"4327\" data-end=\"4330\" \/>D. Tundra<br data-start=\"4339\" data-end=\"4342\" \/><strong data-start=\"4342\" data-end=\"4355\">Answer: B<\/strong><\/p>\n<h3 data-start=\"4357\" data-end=\"4398\">33. Tundra biome is characterized by:<\/h3>\n<p data-start=\"4399\" data-end=\"4488\">A. High temperature<br data-start=\"4418\" data-end=\"4421\" \/>B. Permafrost<br data-start=\"4434\" data-end=\"4437\" \/>C. Heavy rainfall<br data-start=\"4454\" data-end=\"4457\" \/>D. Dense forest<br data-start=\"4472\" data-end=\"4475\" \/><strong data-start=\"4475\" data-end=\"4488\">Answer: B<\/strong><\/p>\n<h3 data-start=\"4490\" data-end=\"4533\">34. Grasslands are mainly dominated by:<\/h3>\n<p data-start=\"4534\" data-end=\"4594\">A. Trees<br data-start=\"4542\" data-end=\"4545\" \/>B. Shrubs<br data-start=\"4554\" data-end=\"4557\" \/>C. Grasses<br data-start=\"4567\" data-end=\"4570\" \/>D. Algae<br data-start=\"4578\" data-end=\"4581\" \/><strong data-start=\"4581\" data-end=\"4594\">Answer: C<\/strong><\/p>\n<h3 data-start=\"4596\" data-end=\"4627\">35. Mangroves are found in:<\/h3>\n<p data-start=\"4628\" data-end=\"4719\">A. Desert areas<br data-start=\"4643\" data-end=\"4646\" \/>B. Mountain regions<br data-start=\"4665\" data-end=\"4668\" \/>C. Coastal areas<br data-start=\"4684\" data-end=\"4687\" \/>D. Polar regions<br data-start=\"4703\" data-end=\"4706\" \/><strong data-start=\"4706\" data-end=\"4719\">Answer: C<\/strong><\/p>\n<hr data-start=\"4721\" data-end=\"4724\" \/>\n<h3 data-start=\"4726\" data-end=\"4774\">36. Ecological succession is the process of:<\/h3>\n<p data-start=\"4775\" data-end=\"4873\">A. Evolution<br data-start=\"4787\" data-end=\"4790\" \/>B. Community change over time<br data-start=\"4819\" data-end=\"4822\" \/>C. Population growth<br data-start=\"4842\" data-end=\"4845\" \/>D. Migration<br data-start=\"4857\" data-end=\"4860\" \/><strong data-start=\"4860\" data-end=\"4873\">Answer: B<\/strong><\/p>\n<h3 data-start=\"4875\" data-end=\"4912\">37. Primary succession occurs on:<\/h3>\n<p data-start=\"4913\" data-end=\"4991\">A. Bare rock<br data-start=\"4925\" data-end=\"4928\" \/>B. Grassland<br data-start=\"4940\" data-end=\"4943\" \/>C. Forest<br data-start=\"4952\" data-end=\"4955\" \/>D. Agricultural land<br data-start=\"4975\" data-end=\"4978\" \/><strong data-start=\"4978\" data-end=\"4991\">Answer: A<\/strong><\/p>\n<h3 data-start=\"4993\" data-end=\"5035\">38. Secondary succession occurs after:<\/h3>\n<p data-start=\"5036\" data-end=\"5125\">A. Volcanic eruption<br data-start=\"5056\" data-end=\"5059\" \/>B. Glacier retreat<br data-start=\"5077\" data-end=\"5080\" \/>C. Forest fire<br data-start=\"5094\" data-end=\"5097\" \/>D. Lava flow<br data-start=\"5109\" data-end=\"5112\" \/><strong data-start=\"5112\" data-end=\"5125\">Answer: C<\/strong><\/p>\n<h3 data-start=\"5127\" data-end=\"5177\">39. Pioneer species in primary succession are:<\/h3>\n<p data-start=\"5178\" data-end=\"5239\">A. Mosses<br data-start=\"5187\" data-end=\"5190\" \/>B. Lichens<br data-start=\"5200\" data-end=\"5203\" \/>C. Trees<br data-start=\"5211\" data-end=\"5214\" \/>D. Shrubs<br data-start=\"5223\" data-end=\"5226\" \/><strong data-start=\"5226\" data-end=\"5239\">Answer: B<\/strong><\/p>\n<h3 data-start=\"5241\" data-end=\"5286\">40. The final stable community is called:<\/h3>\n<p data-start=\"5287\" data-end=\"5394\">A. Pioneer community<br data-start=\"5307\" data-end=\"5310\" \/>B. Intermediate stage<br data-start=\"5331\" data-end=\"5334\" \/>C. Climax community<br data-start=\"5353\" data-end=\"5356\" \/>D. Temporary community<br data-start=\"5378\" data-end=\"5381\" \/><strong data-start=\"5381\" data-end=\"5394\">Answer: C<\/strong><\/p>\n<hr data-start=\"5396\" data-end=\"5399\" \/>\n<h3 data-start=\"5401\" data-end=\"5431\">41. Population density is:<\/h3>\n<p data-start=\"5432\" data-end=\"5530\">A. Total population<br data-start=\"5451\" data-end=\"5454\" \/>B. Individuals per unit area<br data-start=\"5482\" data-end=\"5485\" \/>C. Birth rate<br data-start=\"5498\" data-end=\"5501\" \/>D. Death rate<br data-start=\"5514\" data-end=\"5517\" \/><strong data-start=\"5517\" data-end=\"5530\">Answer: B<\/strong><\/p>\n<h3 data-start=\"5532\" data-end=\"5559\">42. Natality refers to:<\/h3>\n<p data-start=\"5560\" data-end=\"5636\">A. Death rate<br data-start=\"5573\" data-end=\"5576\" \/>B. Birth rate<br data-start=\"5589\" data-end=\"5592\" \/>C. Migration<br data-start=\"5604\" data-end=\"5607\" \/>D. Emigration<br data-start=\"5620\" data-end=\"5623\" \/><strong data-start=\"5623\" data-end=\"5636\">Answer: B<\/strong><\/p>\n<h3 data-start=\"5638\" data-end=\"5666\">43. Mortality refers to:<\/h3>\n<p data-start=\"5667\" data-end=\"5746\">A. Birth rate<br data-start=\"5680\" data-end=\"5683\" \/>B. Immigration<br data-start=\"5697\" data-end=\"5700\" \/>C. Death rate<br data-start=\"5713\" data-end=\"5716\" \/>D. Growth rate<br data-start=\"5730\" data-end=\"5733\" \/><strong data-start=\"5733\" data-end=\"5746\">Answer: C<\/strong><\/p>\n<h3 data-start=\"5748\" data-end=\"5774\">44. Immigration means:<\/h3>\n<p data-start=\"5775\" data-end=\"5863\">A. Leaving a population<br data-start=\"5798\" data-end=\"5801\" \/>B. Entering a population<br data-start=\"5825\" data-end=\"5828\" \/>C. Death<br data-start=\"5836\" data-end=\"5839\" \/>D. Birth<br data-start=\"5847\" data-end=\"5850\" \/><strong data-start=\"5850\" data-end=\"5863\">Answer: B<\/strong><\/p>\n<h3 data-start=\"5865\" data-end=\"5890\">45. Emigration means:<\/h3>\n<p data-start=\"5891\" data-end=\"5980\">A. Entering a population<br data-start=\"5915\" data-end=\"5918\" \/>B. Birth<br data-start=\"5926\" data-end=\"5929\" \/>C. Leaving a population<br data-start=\"5952\" data-end=\"5955\" \/>D. Growth<br data-start=\"5964\" data-end=\"5967\" \/><strong data-start=\"5967\" data-end=\"5980\">Answer: C<\/strong><\/p>\n<hr data-start=\"5982\" data-end=\"5985\" \/>\n<h3 data-start=\"5987\" data-end=\"6045\">46. Population growth curve in unlimited resources is:<\/h3>\n<p data-start=\"6046\" data-end=\"6116\">A. S-shaped<br data-start=\"6057\" data-end=\"6060\" \/>B. J-shaped<br data-start=\"6071\" data-end=\"6074\" \/>C. Straight<br data-start=\"6085\" data-end=\"6088\" \/>D. Irregular<br data-start=\"6100\" data-end=\"6103\" \/><strong data-start=\"6103\" data-end=\"6116\">Answer: B<\/strong><\/p>\n<h3 data-start=\"6118\" data-end=\"6151\">47. Logistic growth curve is:<\/h3>\n<p data-start=\"6152\" data-end=\"6222\">A. J-shaped<br data-start=\"6163\" data-end=\"6166\" \/>B. Exponential<br data-start=\"6180\" data-end=\"6183\" \/>C. S-shaped<br data-start=\"6194\" data-end=\"6197\" \/>D. Zigzag<br data-start=\"6206\" data-end=\"6209\" \/><strong data-start=\"6209\" data-end=\"6222\">Answer: C<\/strong><\/p>\n<h3 data-start=\"6224\" data-end=\"6257\">48. Carrying capacity is the:<\/h3>\n<p data-start=\"6258\" data-end=\"6357\">A. Maximum population supported<br data-start=\"6289\" data-end=\"6292\" \/>B. Birth rate<br data-start=\"6305\" data-end=\"6308\" \/>C. Death rate<br data-start=\"6321\" data-end=\"6324\" \/>D. Migration rate<br data-start=\"6341\" data-end=\"6344\" \/><strong data-start=\"6344\" data-end=\"6357\">Answer: A<\/strong><\/p>\n<h3 data-start=\"6359\" data-end=\"6401\">49. Mutualism is a relationship where:<\/h3>\n<p data-start=\"6402\" data-end=\"6518\">A. One benefits, other harmed<br data-start=\"6431\" data-end=\"6434\" \/>B. Both benefit<br data-start=\"6449\" data-end=\"6452\" \/>C. One benefits, other unaffected<br data-start=\"6485\" data-end=\"6488\" \/>D. Both harmed<br data-start=\"6502\" data-end=\"6505\" \/><strong data-start=\"6505\" data-end=\"6518\">Answer: B<\/strong><\/p>\n<h3 data-start=\"6520\" data-end=\"6563\">50. Parasitism is a relationship where:<\/h3>\n<p data-start=\"6564\" data-end=\"6665\">A. Both benefit<br data-start=\"6579\" data-end=\"6582\" \/>B. One benefits, other harmed<br data-start=\"6611\" data-end=\"6614\" \/>C. Both harmed<br data-start=\"6628\" data-end=\"6631\" \/>D. Both unaffected<br data-start=\"6649\" data-end=\"6652\" \/><strong data-start=\"6652\" data-end=\"6665\">Answer: B<\/strong><\/p>\n<hr data-start=\"6667\" data-end=\"6670\" \/>\n<p><a href=\"https:\/\/murreeroad.org\/human-physiology-mcqs-with-answers-100-multiple-choice-questions\/\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4913\" src=\"https:\/\/murreeroad.org\/wp-content\/uploads\/2025\/12\/Human-Physiology-MCQs-with-Answers-\u2013-100-Multiple-Choice-Questions.png\" alt=\"Human Physiology MCQs with Answers \u2013 100 Multiple Choice Questions\" width=\"1000\" height=\"666\" srcset=\"https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Human-Physiology-MCQs-with-Answers-\u2013-100-Multiple-Choice-Questions.png 1000w, https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Human-Physiology-MCQs-with-Answers-\u2013-100-Multiple-Choice-Questions-300x200.png 300w, https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Human-Physiology-MCQs-with-Answers-\u2013-100-Multiple-Choice-Questions-768x511.png 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/p>\n<hr data-start=\"6667\" data-end=\"6670\" \/>\n<h3 data-start=\"6672\" data-end=\"6699\">51. Commensalism means:<\/h3>\n<p data-start=\"6700\" data-end=\"6818\">A. Both benefit<br data-start=\"6715\" data-end=\"6718\" \/>B. One benefits, other unaffected<br data-start=\"6751\" data-end=\"6754\" \/>C. One harmed, other unaffected<br data-start=\"6785\" data-end=\"6788\" \/>D. Both harmed<br data-start=\"6802\" data-end=\"6805\" \/><strong data-start=\"6805\" data-end=\"6818\">Answer: B<\/strong><\/p>\n<h3 data-start=\"6820\" data-end=\"6847\">52. Predation involves:<\/h3>\n<p data-start=\"6848\" data-end=\"6947\">A. Cooperation<br data-start=\"6862\" data-end=\"6865\" \/>B. One organism killing another<br data-start=\"6896\" data-end=\"6899\" \/>C. Symbiosis<br data-start=\"6911\" data-end=\"6914\" \/>D. Mutual benefit<br data-start=\"6931\" data-end=\"6934\" \/><strong data-start=\"6934\" data-end=\"6947\">Answer: B<\/strong><\/p>\n<h3 data-start=\"6949\" data-end=\"6991\">53. Competition occurs when organisms:<\/h3>\n<p data-start=\"6992\" data-end=\"7094\">A. Cooperate<br data-start=\"7004\" data-end=\"7007\" \/>B. Share resources<br data-start=\"7025\" data-end=\"7028\" \/>C. Compete for same resources<br data-start=\"7057\" data-end=\"7060\" \/>D. Live separately<br data-start=\"7078\" data-end=\"7081\" \/><strong data-start=\"7081\" data-end=\"7094\">Answer: C<\/strong><\/p>\n<h3 data-start=\"7096\" data-end=\"7115\">54. Ecotone is:<\/h3>\n<p data-start=\"7116\" data-end=\"7212\">A. Boundary between two ecosystems<br data-start=\"7150\" data-end=\"7153\" \/>B. A population<br data-start=\"7168\" data-end=\"7171\" \/>C. A species<br data-start=\"7183\" data-end=\"7186\" \/>D. A biome<br data-start=\"7196\" data-end=\"7199\" \/><strong data-start=\"7199\" data-end=\"7212\">Answer: A<\/strong><\/p>\n<h3 data-start=\"7214\" data-end=\"7244\">55. Edge effect refers to:<\/h3>\n<p data-start=\"7245\" data-end=\"7359\">A. Reduced diversity<br data-start=\"7265\" data-end=\"7268\" \/>B. Increased diversity at ecotone<br data-start=\"7301\" data-end=\"7304\" \/>C. Population decline<br data-start=\"7325\" data-end=\"7328\" \/>D. Habitat loss<br data-start=\"7343\" data-end=\"7346\" \/><strong data-start=\"7346\" data-end=\"7359\">Answer: B<\/strong><\/p>\n<hr data-start=\"7361\" data-end=\"7364\" \/>\n<h3 data-start=\"7366\" data-end=\"7397\">56. Biodiversity refers to:<\/h3>\n<p data-start=\"7398\" data-end=\"7498\">A. Number of animals<br data-start=\"7418\" data-end=\"7421\" \/>B. Variety of life forms<br data-start=\"7445\" data-end=\"7448\" \/>C. Forest area<br data-start=\"7462\" data-end=\"7465\" \/>D. Climate change<br data-start=\"7482\" data-end=\"7485\" \/><strong data-start=\"7485\" data-end=\"7498\">Answer: B<\/strong><\/p>\n<h3 data-start=\"7500\" data-end=\"7546\">57. Which region has highest biodiversity?<\/h3>\n<p data-start=\"7547\" data-end=\"7617\">A. Polar regions<br data-start=\"7563\" data-end=\"7566\" \/>B. Deserts<br data-start=\"7576\" data-end=\"7579\" \/>C. Tropics<br data-start=\"7589\" data-end=\"7592\" \/>D. Tundra<br data-start=\"7601\" data-end=\"7604\" \/><strong data-start=\"7604\" data-end=\"7617\">Answer: C<\/strong><\/p>\n<h3 data-start=\"7619\" data-end=\"7647\">58. Endemic species are:<\/h3>\n<p data-start=\"7648\" data-end=\"7741\">A. Found everywhere<br data-start=\"7667\" data-end=\"7670\" \/>B. Found in one region only<br data-start=\"7697\" data-end=\"7700\" \/>C. Migratory<br data-start=\"7712\" data-end=\"7715\" \/>D. Extinct<br data-start=\"7725\" data-end=\"7728\" \/><strong data-start=\"7728\" data-end=\"7741\">Answer: B<\/strong><\/p>\n<h3 data-start=\"7743\" data-end=\"7778\">59. Species richness refers to:<\/h3>\n<p data-start=\"7779\" data-end=\"7872\">A. Population size<br data-start=\"7797\" data-end=\"7800\" \/>B. Number of species<br data-start=\"7820\" data-end=\"7823\" \/>C. Genetic diversity<br data-start=\"7843\" data-end=\"7846\" \/>D. Biomass<br data-start=\"7856\" data-end=\"7859\" \/><strong data-start=\"7859\" data-end=\"7872\">Answer: B<\/strong><\/p>\n<h3 data-start=\"7874\" data-end=\"7904\">60. Keystone species have:<\/h3>\n<p data-start=\"7905\" data-end=\"8005\">A. Minor role<br data-start=\"7918\" data-end=\"7921\" \/>B. No role<br data-start=\"7931\" data-end=\"7934\" \/>C. Disproportionately large impact<br data-start=\"7968\" data-end=\"7971\" \/>D. Negative impact<br data-start=\"7989\" data-end=\"7992\" \/><strong data-start=\"7992\" data-end=\"8005\">Answer: C<\/strong><\/p>\n<hr data-start=\"8007\" data-end=\"8010\" \/>\n<h3 data-start=\"8012\" data-end=\"8059\">61. The main cause of biodiversity loss is:<\/h3>\n<p data-start=\"8060\" data-end=\"8153\">A. Natural disasters<br data-start=\"8080\" data-end=\"8083\" \/>B. Habitat destruction<br data-start=\"8105\" data-end=\"8108\" \/>C. Migration<br data-start=\"8120\" data-end=\"8123\" \/>D. Competition<br data-start=\"8137\" data-end=\"8140\" \/><strong data-start=\"8140\" data-end=\"8153\">Answer: B<\/strong><\/p>\n<h3 data-start=\"8155\" data-end=\"8186\">62. Deforestation leads to:<\/h3>\n<p data-start=\"8187\" data-end=\"8288\">A. Increased biodiversity<br data-start=\"8212\" data-end=\"8215\" \/>B. Soil erosion<br data-start=\"8230\" data-end=\"8233\" \/>C. Climate stability<br data-start=\"8253\" data-end=\"8256\" \/>D. More rainfall<br data-start=\"8272\" data-end=\"8275\" \/><strong data-start=\"8275\" data-end=\"8288\">Answer: B<\/strong><\/p>\n<h3 data-start=\"8290\" data-end=\"8323\">63. Greenhouse gases include:<\/h3>\n<p data-start=\"8324\" data-end=\"8397\">A. Oxygen<br data-start=\"8333\" data-end=\"8336\" \/>B. Nitrogen<br data-start=\"8347\" data-end=\"8350\" \/>C. Carbon dioxide<br data-start=\"8367\" data-end=\"8370\" \/>D. Hydrogen<br data-start=\"8381\" data-end=\"8384\" \/><strong data-start=\"8384\" data-end=\"8397\">Answer: C<\/strong><\/p>\n<h3 data-start=\"8399\" data-end=\"8435\">64. Global warming is caused by:<\/h3>\n<p data-start=\"8436\" data-end=\"8532\">A. Ozone depletion<br data-start=\"8454\" data-end=\"8457\" \/>B. Greenhouse effect<br data-start=\"8477\" data-end=\"8480\" \/>C. Acid rain<br data-start=\"8492\" data-end=\"8495\" \/>D. Deforestation only<br data-start=\"8516\" data-end=\"8519\" \/><strong data-start=\"8519\" data-end=\"8532\">Answer: B<\/strong><\/p>\n<h3 data-start=\"8534\" data-end=\"8574\">65. Ozone layer protects Earth from:<\/h3>\n<p data-start=\"8575\" data-end=\"8655\">A. Infrared rays<br data-start=\"8591\" data-end=\"8594\" \/>B. UV rays<br data-start=\"8604\" data-end=\"8607\" \/>C. Visible light<br data-start=\"8623\" data-end=\"8626\" \/>D. Gamma rays<br data-start=\"8639\" data-end=\"8642\" \/><strong data-start=\"8642\" data-end=\"8655\">Answer: B<\/strong><\/p>\n<hr data-start=\"8657\" data-end=\"8660\" \/>\n<h3 data-start=\"8662\" data-end=\"8700\">66. Acid rain is mainly caused by:<\/h3>\n<p data-start=\"8701\" data-end=\"8757\">A. CO\u2082<br data-start=\"8707\" data-end=\"8710\" \/>B. SO\u2082 and NO\u2082<br data-start=\"8724\" data-end=\"8727\" \/>C. O\u2082<br data-start=\"8732\" data-end=\"8735\" \/>D. CH\u2084<br data-start=\"8741\" data-end=\"8744\" \/><strong data-start=\"8744\" data-end=\"8757\">Answer: B<\/strong><\/p>\n<h3 data-start=\"8759\" data-end=\"8794\">67. Biomagnification refers to:<\/h3>\n<p data-start=\"8795\" data-end=\"8933\">A. Decrease of pollutants<br data-start=\"8820\" data-end=\"8823\" \/>B. Increase of pollutants at higher trophic levels<br data-start=\"8873\" data-end=\"8876\" \/>C. Energy transfer<br data-start=\"8894\" data-end=\"8897\" \/>D. Population growth<br data-start=\"8917\" data-end=\"8920\" \/><strong data-start=\"8920\" data-end=\"8933\">Answer: B<\/strong><\/p>\n<h3 data-start=\"8935\" data-end=\"8964\">68. DDT is an example of:<\/h3>\n<p data-start=\"8965\" data-end=\"9074\">A. Biodegradable pollutant<br data-start=\"8991\" data-end=\"8994\" \/>B. Non-biodegradable pollutant<br data-start=\"9024\" data-end=\"9027\" \/>C. Greenhouse gas<br data-start=\"9044\" data-end=\"9047\" \/>D. Nutrient<br data-start=\"9058\" data-end=\"9061\" \/><strong data-start=\"9061\" data-end=\"9074\">Answer: B<\/strong><\/p>\n<h3 data-start=\"9076\" data-end=\"9119\">69. Conservation of biodiversity means:<\/h3>\n<p data-start=\"9120\" data-end=\"9233\">A. Destroying habitats<br data-start=\"9142\" data-end=\"9145\" \/>B. Protecting life forms<br data-start=\"9169\" data-end=\"9172\" \/>C. Exploiting resources<br data-start=\"9195\" data-end=\"9198\" \/>D. Ignoring species<br data-start=\"9217\" data-end=\"9220\" \/><strong data-start=\"9220\" data-end=\"9233\">Answer: B<\/strong><\/p>\n<h3 data-start=\"9235\" data-end=\"9270\">70. In-situ conservation means:<\/h3>\n<p data-start=\"9271\" data-end=\"9386\">A. Conservation in zoos<br data-start=\"9294\" data-end=\"9297\" \/>B. Conservation in natural habitat<br data-start=\"9331\" data-end=\"9334\" \/>C. Seed banks<br data-start=\"9347\" data-end=\"9350\" \/>D. Botanical gardens<br data-start=\"9370\" data-end=\"9373\" \/><strong data-start=\"9373\" data-end=\"9386\">Answer: B<\/strong><\/p>\n<hr data-start=\"9388\" data-end=\"9391\" \/>\n<h3 data-start=\"9393\" data-end=\"9431\">71. Ex-situ conservation includes:<\/h3>\n<p data-start=\"9432\" data-end=\"9547\">A. National parks<br data-start=\"9449\" data-end=\"9452\" \/>B. Wildlife sanctuaries<br data-start=\"9475\" data-end=\"9478\" \/>C. Zoos and botanical gardens<br data-start=\"9507\" data-end=\"9510\" \/>D. Biosphere reserves<br data-start=\"9531\" data-end=\"9534\" \/><strong data-start=\"9534\" data-end=\"9547\">Answer: C<\/strong><\/p>\n<h3 data-start=\"9549\" data-end=\"9590\">72. Biosphere reserves are meant for:<\/h3>\n<p data-start=\"9591\" data-end=\"9702\">A. Only conservation<br data-start=\"9611\" data-end=\"9614\" \/>B. Only research<br data-start=\"9630\" data-end=\"9633\" \/>C. Conservation and sustainable use<br data-start=\"9668\" data-end=\"9671\" \/>D. Tourism only<br data-start=\"9686\" data-end=\"9689\" \/><strong data-start=\"9689\" data-end=\"9702\">Answer: C<\/strong><\/p>\n<h3 data-start=\"9704\" data-end=\"9739\">73. The Red Data Book contains:<\/h3>\n<p data-start=\"9740\" data-end=\"9845\">A. Endangered species list<br data-start=\"9766\" data-end=\"9769\" \/>B. Common species<br data-start=\"9786\" data-end=\"9789\" \/>C. Extinct species only<br data-start=\"9812\" data-end=\"9815\" \/>D. Plants only<br data-start=\"9829\" data-end=\"9832\" \/><strong data-start=\"9832\" data-end=\"9845\">Answer: A<\/strong><\/p>\n<h3 data-start=\"9847\" data-end=\"9871\">74. IUCN stands for:<\/h3>\n<p data-start=\"9872\" data-end=\"10045\">A. International Union for Conservation of Nature<br data-start=\"9921\" data-end=\"9924\" \/>B. Indian Union for Climate Network<br data-start=\"9959\" data-end=\"9962\" \/>C. International United Climate Network<br data-start=\"10001\" data-end=\"10004\" \/>D. Indian Union of Nature<br data-start=\"10029\" data-end=\"10032\" \/><strong data-start=\"10032\" data-end=\"10045\">Answer: A<\/strong><\/p>\n<h3 data-start=\"10047\" data-end=\"10085\">75. Sustainable development means:<\/h3>\n<p data-start=\"10086\" data-end=\"10221\">A. Development without harming environment<br data-start=\"10128\" data-end=\"10131\" \/>B. Fast development<br data-start=\"10150\" data-end=\"10153\" \/>C. Industrial growth only<br data-start=\"10178\" data-end=\"10181\" \/>D. Resource exploitation<br data-start=\"10205\" data-end=\"10208\" \/><strong data-start=\"10208\" data-end=\"10221\">Answer: A<\/strong><\/p>\n<hr data-start=\"10223\" data-end=\"10226\" \/>\n<h3 data-start=\"10228\" data-end=\"10260\">76. Renewable resources are:<\/h3>\n<p data-start=\"10261\" data-end=\"10339\">A. Limited<br data-start=\"10271\" data-end=\"10274\" \/>B. Exhaustible<br data-start=\"10288\" data-end=\"10291\" \/>C. Replenishable<br data-start=\"10307\" data-end=\"10310\" \/>D. Non-living<br data-start=\"10323\" data-end=\"10326\" \/><strong data-start=\"10326\" data-end=\"10339\">Answer: C<\/strong><\/p>\n<h3 data-start=\"10341\" data-end=\"10381\">77. Non-renewable resources include:<\/h3>\n<p data-start=\"10382\" data-end=\"10444\">A. Wind<br data-start=\"10389\" data-end=\"10392\" \/>B. Solar energy<br data-start=\"10407\" data-end=\"10410\" \/>C. Coal<br data-start=\"10417\" data-end=\"10420\" \/>D. Water<br data-start=\"10428\" data-end=\"10431\" \/><strong data-start=\"10431\" data-end=\"10444\">Answer: C<\/strong><\/p>\n<h3 data-start=\"10446\" data-end=\"10485\">78. Ecosystem stability depends on:<\/h3>\n<p data-start=\"10486\" data-end=\"10571\">A. Species diversity<br data-start=\"10506\" data-end=\"10509\" \/>B. Climate only<br data-start=\"10524\" data-end=\"10527\" \/>C. Soil only<br data-start=\"10539\" data-end=\"10542\" \/>D. Water only<br data-start=\"10555\" data-end=\"10558\" \/><strong data-start=\"10558\" data-end=\"10571\">Answer: A<\/strong><\/p>\n<h3 data-start=\"10573\" data-end=\"10609\">79. The nitrogen cycle involves:<\/h3>\n<p data-start=\"10610\" data-end=\"10711\">A. Only plants<br data-start=\"10624\" data-end=\"10627\" \/>B. Only animals<br data-start=\"10642\" data-end=\"10645\" \/>C. Atmosphere, soil, and organisms<br data-start=\"10679\" data-end=\"10682\" \/>D. Water only<br data-start=\"10695\" data-end=\"10698\" \/><strong data-start=\"10698\" data-end=\"10711\">Answer: C<\/strong><\/p>\n<h3 data-start=\"10713\" data-end=\"10748\">80. Nitrogen fixation converts:<\/h3>\n<p data-start=\"10749\" data-end=\"10854\">A. N\u2082 to ammonia<br data-start=\"10765\" data-end=\"10768\" \/>B. Ammonia to nitrate<br data-start=\"10789\" data-end=\"10792\" \/>C. Nitrate to nitrogen<br data-start=\"10814\" data-end=\"10817\" \/>D. Oxygen to nitrogen<br data-start=\"10838\" data-end=\"10841\" \/><strong data-start=\"10841\" data-end=\"10854\">Answer: A<\/strong><\/p>\n<hr data-start=\"10856\" data-end=\"10859\" \/>\n<h3 data-start=\"10861\" data-end=\"10897\">81. Which bacteria fix nitrogen?<\/h3>\n<p data-start=\"10898\" data-end=\"10977\">A. Rhizobium<br data-start=\"10910\" data-end=\"10913\" \/>B. Lactobacillus<br data-start=\"10929\" data-end=\"10932\" \/>C. E. coli<br data-start=\"10942\" data-end=\"10945\" \/>D. Streptococcus<br data-start=\"10961\" data-end=\"10964\" \/><strong data-start=\"10964\" data-end=\"10977\">Answer: A<\/strong><\/p>\n<h3 data-start=\"10979\" data-end=\"11021\">82. Carbon cycle maintains balance of:<\/h3>\n<p data-start=\"11022\" data-end=\"11095\">A. Oxygen<br data-start=\"11031\" data-end=\"11034\" \/>B. Nitrogen<br data-start=\"11045\" data-end=\"11048\" \/>C. Carbon dioxide<br data-start=\"11065\" data-end=\"11068\" \/>D. Hydrogen<br data-start=\"11079\" data-end=\"11082\" \/><strong data-start=\"11082\" data-end=\"11095\">Answer: C<\/strong><\/p>\n<h3 data-start=\"11097\" data-end=\"11126\">83. Water cycle includes:<\/h3>\n<p data-start=\"11127\" data-end=\"11212\">A. Evaporation<br data-start=\"11141\" data-end=\"11144\" \/>B. Condensation<br data-start=\"11159\" data-end=\"11162\" \/>C. Precipitation<br data-start=\"11178\" data-end=\"11181\" \/>D. All of these<br data-start=\"11196\" data-end=\"11199\" \/><strong data-start=\"11199\" data-end=\"11212\">Answer: D<\/strong><\/p>\n<h3 data-start=\"11214\" data-end=\"11248\">84. Primary consumers feed on:<\/h3>\n<p data-start=\"11249\" data-end=\"11335\">A. Carnivores<br data-start=\"11262\" data-end=\"11265\" \/>B. Producers<br data-start=\"11277\" data-end=\"11280\" \/>C. Decomposers<br data-start=\"11294\" data-end=\"11297\" \/>D. Secondary consumers<br data-start=\"11319\" data-end=\"11322\" \/><strong data-start=\"11322\" data-end=\"11335\">Answer: B<\/strong><\/p>\n<h3 data-start=\"11337\" data-end=\"11373\">85. Secondary consumers feed on:<\/h3>\n<p data-start=\"11374\" data-end=\"11447\">A. Producers<br data-start=\"11386\" data-end=\"11389\" \/>B. Herbivores<br data-start=\"11402\" data-end=\"11405\" \/>C. Plants<br data-start=\"11414\" data-end=\"11417\" \/>D. Decomposers<br data-start=\"11431\" data-end=\"11434\" \/><strong data-start=\"11434\" data-end=\"11447\">Answer: B<\/strong><\/p>\n<hr data-start=\"11449\" data-end=\"11452\" \/>\n<h3 data-start=\"11454\" data-end=\"11493\">86. Tertiary consumers are usually:<\/h3>\n<p data-start=\"11494\" data-end=\"11583\">A. Herbivores<br data-start=\"11507\" data-end=\"11510\" \/>B. Primary consumers<br data-start=\"11530\" data-end=\"11533\" \/>C. Top carnivores<br data-start=\"11550\" data-end=\"11553\" \/>D. Decomposers<br data-start=\"11567\" data-end=\"11570\" \/><strong data-start=\"11570\" data-end=\"11583\">Answer: C<\/strong><\/p>\n<h3 data-start=\"11585\" data-end=\"11621\">87. Energy flow in ecosystem is:<\/h3>\n<p data-start=\"11622\" data-end=\"11698\">A. Cyclic<br data-start=\"11631\" data-end=\"11634\" \/>B. Unidirectional<br data-start=\"11651\" data-end=\"11654\" \/>C. Bidirectional<br data-start=\"11670\" data-end=\"11673\" \/>D. Random<br data-start=\"11682\" data-end=\"11685\" \/><strong data-start=\"11685\" data-end=\"11698\">Answer: B<\/strong><\/p>\n<h3 data-start=\"11700\" data-end=\"11728\">88. Nutrient cycles are:<\/h3>\n<p data-start=\"11729\" data-end=\"11800\">A. Linear<br data-start=\"11738\" data-end=\"11741\" \/>B. Unidirectional<br data-start=\"11758\" data-end=\"11761\" \/>C. Cyclic<br data-start=\"11770\" data-end=\"11773\" \/>D. One-time<br data-start=\"11784\" data-end=\"11787\" \/><strong data-start=\"11787\" data-end=\"11800\">Answer: C<\/strong><\/p>\n<h3 data-start=\"11802\" data-end=\"11842\">89. Detritus food chain starts with:<\/h3>\n<p data-start=\"11843\" data-end=\"11928\">A. Producers<br data-start=\"11855\" data-end=\"11858\" \/>B. Herbivores<br data-start=\"11871\" data-end=\"11874\" \/>C. Dead organic matter<br data-start=\"11896\" data-end=\"11899\" \/>D. Carnivores<br data-start=\"11912\" data-end=\"11915\" \/><strong data-start=\"11915\" data-end=\"11928\">Answer: C<\/strong><\/p>\n<h3 data-start=\"11930\" data-end=\"11969\">90. Grazing food chain starts with:<\/h3>\n<p data-start=\"11970\" data-end=\"12046\">A. Producers<br data-start=\"11982\" data-end=\"11985\" \/>B. Decomposers<br data-start=\"11999\" data-end=\"12002\" \/>C. Carnivores<br data-start=\"12015\" data-end=\"12018\" \/>D. Parasites<br data-start=\"12030\" data-end=\"12033\" \/><strong data-start=\"12033\" data-end=\"12046\">Answer: A<\/strong><\/p>\n<hr data-start=\"12048\" data-end=\"12051\" \/>\n<h3 data-start=\"12053\" data-end=\"12086\">91. Ecological balance means:<\/h3>\n<p data-start=\"12087\" data-end=\"12200\">A. Equal population<br data-start=\"12106\" data-end=\"12109\" \/>B. Stable interaction among organisms<br data-start=\"12146\" data-end=\"12149\" \/>C. No predators<br data-start=\"12164\" data-end=\"12167\" \/>D. No competition<br data-start=\"12184\" data-end=\"12187\" \/><strong data-start=\"12187\" data-end=\"12200\">Answer: B<\/strong><\/p>\n<h3 data-start=\"12202\" data-end=\"12241\">92. Habitat fragmentation leads to:<\/h3>\n<p data-start=\"12242\" data-end=\"12353\">A. Increased biodiversity<br data-start=\"12267\" data-end=\"12270\" \/>B. Species extinction<br data-start=\"12291\" data-end=\"12294\" \/>C. Stable ecosystems<br data-start=\"12314\" data-end=\"12317\" \/>D. Population growth<br data-start=\"12337\" data-end=\"12340\" \/><strong data-start=\"12340\" data-end=\"12353\">Answer: B<\/strong><\/p>\n<h3 data-start=\"12355\" data-end=\"12385\">93. Overpopulation causes:<\/h3>\n<p data-start=\"12386\" data-end=\"12496\">A. Resource depletion<br data-start=\"12407\" data-end=\"12410\" \/>B. Ecosystem balance<br data-start=\"12430\" data-end=\"12433\" \/>C. Biodiversity increase<br data-start=\"12457\" data-end=\"12460\" \/>D. Climate stability<br data-start=\"12480\" data-end=\"12483\" \/><strong data-start=\"12483\" data-end=\"12496\">Answer: A<\/strong><\/p>\n<h3 data-start=\"12498\" data-end=\"12519\">94. Pollution is:<\/h3>\n<p data-start=\"12520\" data-end=\"12623\">A. Beneficial<br data-start=\"12533\" data-end=\"12536\" \/>B. Harmless<br data-start=\"12547\" data-end=\"12550\" \/>C. Undesirable change in environment<br data-start=\"12586\" data-end=\"12589\" \/>D. Natural balance<br data-start=\"12607\" data-end=\"12610\" \/><strong data-start=\"12610\" data-end=\"12623\">Answer: C<\/strong><\/p>\n<h3 data-start=\"12625\" data-end=\"12657\">95. Noise pollution affects:<\/h3>\n<p data-start=\"12658\" data-end=\"12718\">A. Hearing<br data-start=\"12668\" data-end=\"12671\" \/>B. Vision<br data-start=\"12680\" data-end=\"12683\" \/>C. Taste<br data-start=\"12691\" data-end=\"12694\" \/>D. Smell<br data-start=\"12702\" data-end=\"12705\" \/><strong data-start=\"12705\" data-end=\"12718\">Answer: A<\/strong><\/p>\n<hr data-start=\"12720\" data-end=\"12723\" \/>\n<h3 data-start=\"12725\" data-end=\"12757\">96. Water pollution affects:<\/h3>\n<p data-start=\"12758\" data-end=\"12835\">A. Aquatic life<br data-start=\"12773\" data-end=\"12776\" \/>B. Soil only<br data-start=\"12788\" data-end=\"12791\" \/>C. Air only<br data-start=\"12802\" data-end=\"12805\" \/>D. Forest only<br data-start=\"12819\" data-end=\"12822\" \/><strong data-start=\"12822\" data-end=\"12835\">Answer: A<\/strong><\/p>\n<h3 data-start=\"12837\" data-end=\"12878\">97. Soil erosion is mainly caused by:<\/h3>\n<p data-start=\"12879\" data-end=\"12949\">A. Wind and water<br data-start=\"12896\" data-end=\"12899\" \/>B. Fire<br data-start=\"12906\" data-end=\"12909\" \/>C. Animals<br data-start=\"12919\" data-end=\"12922\" \/>D. Microbes<br data-start=\"12933\" data-end=\"12936\" \/><strong data-start=\"12936\" data-end=\"12949\">Answer: A<\/strong><\/p>\n<h3 data-start=\"12951\" data-end=\"12979\">98. Afforestation means:<\/h3>\n<p data-start=\"12980\" data-end=\"13073\">A. Cutting trees<br data-start=\"12996\" data-end=\"12999\" \/>B. Planting trees<br data-start=\"13016\" data-end=\"13019\" \/>C. Removing forest<br data-start=\"13037\" data-end=\"13040\" \/>D. Burning forest<br data-start=\"13057\" data-end=\"13060\" \/><strong data-start=\"13060\" data-end=\"13073\">Answer: B<\/strong><\/p>\n<h3 data-start=\"13075\" data-end=\"13105\">99. Conservation helps in:<\/h3>\n<p data-start=\"13106\" data-end=\"13213\">A. Extinction<br data-start=\"13119\" data-end=\"13122\" \/>B. Environmental protection<br data-start=\"13149\" data-end=\"13152\" \/>C. Pollution increase<br data-start=\"13173\" data-end=\"13176\" \/>D. Resource depletion<br data-start=\"13197\" data-end=\"13200\" \/><strong data-start=\"13200\" data-end=\"13213\">Answer: B<\/strong><\/p>\n<h3 data-start=\"13215\" data-end=\"13252\">100. Ecology helps us understand:<\/h3>\n<p data-start=\"13253\" data-end=\"13344\">A. Nature balance<br data-start=\"13270\" data-end=\"13273\" \/>B. Human evolution<br data-start=\"13291\" data-end=\"13294\" \/>C. Cell biology<br data-start=\"13309\" data-end=\"13312\" \/>D. Genetics only<br data-start=\"13328\" data-end=\"13331\" \/><strong data-start=\"13331\" data-end=\"13344\">Answer: A<\/strong><\/p>\n<p data-start=\"13253\" data-end=\"13344\"><a href=\"https:\/\/rgsoftwares.com\/school-management-software\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4896\" src=\"https:\/\/murreeroad.org\/wp-content\/uploads\/2025\/12\/School-Management-software-1.png\" alt=\"\" width=\"1500\" height=\"98\" srcset=\"https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/School-Management-software-1.png 1500w, https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/School-Management-software-1-300x20.png 300w, https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/School-Management-software-1-1024x67.png 1024w, https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/School-Management-software-1-768x50.png 768w\" sizes=\"auto, (max-width: 1500px) 100vw, 1500px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Practice 100 Ecology MCQs with answers covering ecosystems, food chains, biodiversity, ecological succession, and environmental conservation. Ideal for students and competitive exams. Ecology is a vital branch of biology that studies the relationships between living organisms and their environment, highlighting how ecosystems function and remain balanced. Understanding ecological concepts such as ecosystems, food chains, food &#8230; <a title=\"Ecology MCQs with Answers \u2013 100 Multiple Choice Questions\" class=\"read-more\" href=\"https:\/\/learn-nest.murreeroad.org\/blog\/ecology-mcqs-with-answers-100-multiple-choice-questions\/\" aria-label=\"Read more about Ecology MCQs with Answers \u2013 100 Multiple Choice Questions\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":4921,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"googlesitekit_rrm_CAowprK_DA:productID":"","om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2106],"tags":[2121,2781,2778,2715,2782,2786,2776,2784,2777,2779,2783,2780,2787,2702,2788,2785,2789],"class_list":["post-4918","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mcqs","tag-100-multiple-choice-questions","tag-biodiversity-mcqs","tag-biology-mcqs-ecology","tag-competitive-exam-biology","tag-ecological-succession-mcqs","tag-ecology-is-the-study-of","tag-ecology-mcqs","tag-ecology-mcqs-with-answers","tag-ecology-questions-with-answers","tag-ecosystem-mcqs","tag-environment-and-ecology-questions","tag-food-chain-and-food-web-questions","tag-food-webs","tag-general-science-mcqs","tag-gross-primary-productivity","tag-mcqs-on-ecology","tag-primary-succession-occurs"],"aioseo_notices":[],"uagb_featured_image_src":{"full":["https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Ecology-MCQs-with-Answers.png",1536,1024,false],"thumbnail":["https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Ecology-MCQs-with-Answers-150x150.png",150,150,true],"medium":["https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Ecology-MCQs-with-Answers-300x200.png",300,200,true],"medium_large":["https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Ecology-MCQs-with-Answers-768x512.png",768,512,true],"large":["https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Ecology-MCQs-with-Answers-1024x683.png",1024,683,true],"1536x1536":["https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Ecology-MCQs-with-Answers.png",1536,1024,false],"2048x2048":["https:\/\/learn-nest.murreeroad.org\/blog\/wp-content\/uploads\/2025\/12\/Ecology-MCQs-with-Answers.png",1536,1024,false]},"uagb_author_info":{"display_name":"admin","author_link":"https:\/\/learn-nest.murreeroad.org\/blog\/author\/admin\/"},"uagb_comment_info":0,"uagb_excerpt":"Practice 100 Ecology MCQs with answers covering ecosystems, food chains, biodiversity, ecological succession, and environmental conservation. Ideal for students and competitive exams. Ecology is a vital branch of biology that studies the relationships between living organisms and their environment, highlighting how ecosystems function and remain balanced. Understanding ecological concepts such as ecosystems, food chains, food&hellip;","_links":{"self":[{"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/posts\/4918","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/comments?post=4918"}],"version-history":[{"count":1,"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/posts\/4918\/revisions"}],"predecessor-version":[{"id":4920,"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/posts\/4918\/revisions\/4920"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/media\/4921"}],"wp:attachment":[{"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/media?parent=4918"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/categories?post=4918"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/learn-nest.murreeroad.org\/blog\/wp-json\/wp\/v2\/tags?post=4918"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}