MCQOPTIONS
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MCQOPTIONS
This section includes 52 Mcqs, each offering curated multiple-choice questions to sharpen your Biology Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Study of relationship of organisms to their environment is |
| A. | Ecology |
| B. | Palaentology |
| C. | Geology |
| D. | None of these |
| Answer» B. Palaentology | |
| 2. |
All populations within an ecosystem interconnected to one another are known as |
| A. | Species |
| B. | Family |
| C. | Community |
| D. | Biomes |
| Answer» D. Biomes | |
| 3. |
Major regional ecological community of plants and animals forms |
| A. | Biosphere |
| B. | Biomass |
| C. | Biomes |
| D. | Bioecosystem |
| Answer» D. Bioecosystem | |
| 4. |
The actual location or place where an organism lives is |
| A. | Environment |
| B. | Biosphere |
| C. | Biomass |
| D. | Habitat |
| Answer» E. | |
| 5. |
The role a species plays in a community including behavior and influence is |
| A. | Nichon |
| B. | Niche |
| C. | Autecology |
| D. | Profession |
| Answer» C. Autecology | |
| 6. |
The biosphere covers about |
| A. | 8-10 km |
| B. | 5-10 km |
| C. | 15-30 km |
| D. | 16-20 km |
| Answer» E. | |
| 7. |
Ecosystem of Shogran is |
| A. | Coniferous alpine |
| B. | Boreal |
| C. | Temperate deciduous |
| D. | Grassland |
| Answer» D. Grassland | |
| 8. |
Mountains of Koh Hindukush come under |
| A. | Tundra |
| B. | Grass land |
| C. | Tropical forests |
| D. | Temperate deciduous |
| Answer» B. Grass land | |
| 9. |
Annual rainfall in grass land is |
| A. | 1500-2500 mm |
| B. | 750-1500 mm |
| C. | 250-750 mm |
| D. | 250-500 mm |
| Answer» D. 250-500 mm | |
| 10. |
One of the most important cause of desertification is |
| A. | Floods |
| B. | Wind blowing |
| C. | Raining |
| D. | Deforestation |
| Answer» E. | |
| 11. |
Desert ecosystem of Mianwali is |
| A. | Thar |
| B. | Thal |
| C. | Cholistan |
| D. | None of these |
| Answer» C. Cholistan | |
| 12. |
In sub-humid tropical grassland productivity is more than |
| A. | 700-1500g/m2 |
| B. | 4000g/m2 |
| C. | 5000g/m2 |
| D. | 6050g/m2 |
| Answer» C. 5000g/m2 | |
| 13. |
Annual rainfall in deserts is less than |
| A. | 150-200 mm |
| B. | 500-700 mm |
| C. | 250-500 mm |
| D. | 700-800mm |
| Answer» D. 700-800mm | |
| 14. |
Treeless tundra of high latitude between taiga and polar ice caps is called |
| A. | Northern tundra |
| B. | Antarctic tundra |
| C. | Arctic tundra |
| D. | Polar tundra |
| Answer» D. Polar tundra | |
| 15. |
The most fragile of all biomes is |
| A. | Grassland |
| B. | Coniferous alpine |
| C. | Desert |
| D. | Tundra |
| Answer» E. | |
| 16. |
Which of the following step of nitrogen cycle is not useful for plants |
| A. | Ammonification |
| B. | Nitrification |
| C. | Denitrification |
| D. | Both a and c |
| Answer» D. Both a and c | |
| 17. |
Weather refers to |
| A. | Short-term fluctuations in temperature, cloud cover, wind and precipitation |
| B. | It prevails over periods of hrs or days |
| C. | Overall patterns of weather that prevail from year to year |
| D. | Both a and b |
| Answer» E. | |
| 18. |
Which statement about hydrospheric ecosystem is incorrect? |
| A. | Salt water ocean and sea are the largest ecosystems on earth |
| B. | Salt water ecosystem covers about 75% earth surface |
| C. | Fresh water ecosystem covers less than 1% of earth surface |
| D. | It temperature is more moderate to support life |
| Answer» C. Fresh water ecosystem covers less than 1% of earth surface | |
| 19. |
Productivity of an ecosystem is indicated by |
| A. | Number of plants in that ecosystem |
| B. | The density of that ecosystem |
| C. | Consumption of carbon dioxide and evolve of oxygen |
| D. | Both a and b |
| Answer» E. | |
| 20. |
In which zone plant community is most diverse |
| A. | Limnetic zone |
| B. | Littoral zone |
| C. | Profundal zone |
| D. | All of these |
| Answer» C. Profundal zone | |
| 21. |
Which statement about profundal zone is correct? |
| A. | Plants are unable to anchor but enough light penetrates to support photosynthesis |
| B. | Phytoplanktons in this region are cyanobacteria |
| C. | Decomposers and detritus feeders inhabit it |
| D. | Water lilies are abundant |
| Answer» D. Water lilies are abundant | |
| 22. |
Eutrophication is |
| A. | Process of decreasing nutrients by human activities |
| B. | Adequate nutrition accelerated by human activities |
| C. | Changing the trophic levels of an ecosystem by human activities |
| D. | Addition of more predators in an ecosystem |
| Answer» C. Changing the trophic levels of an ecosystem by human activities | |
| 23. |
In polluted lake which organisms dominate the community |
| A. | Fish |
| B. | Crustaceans |
| C. | Phytoplanktons |
| D. | Blue green algae |
| Answer» E. | |
| 24. |
Evolution of vascular bundles in plants and skeleton in animals is an adaptation for |
| A. | Hdrospheric ecosystem |
| B. | Aquatic ecosystem |
| C. | Terrestrial ecosystem |
| D. | All of these |
| Answer» D. All of these | |
| 25. |
Development of bark in plants and skin in animals is a method for |
| A. | Providing support |
| B. | Protection from enemies |
| C. | Reducing water loss |
| D. | Helping in food production |
| Answer» D. Helping in food production | |
| 26. |
Temperature of temperate deciduous forests is |
| A. | 4-30 degree C |
| B. | 45-50 degree C |
| C. | 20-25 degree C |
| D. | 5-10 degree C |
| Answer» B. 45-50 degree C | |
| 27. |
Coniferous forests located at high altitude are called |
| A. | Taiga |
| B. | Alpine |
| C. | Boreal |
| D. | Arctic |
| Answer» C. Boreal | |
| 28. |
Grass land in tropic climates with woody trees is called |
| A. | Prairies |
| B. | Savanna |
| C. | Boreal |
| D. | Alpines |
| Answer» C. Boreal | |
| 29. |
Zone of lake water which is of open water near the surface is |
| A. | Littoral |
| B. | Limnetic |
| C. | Profundal |
| D. | Benthic |
| Answer» C. Profundal | |
| 30. |
Wood forests form the |
| A. | Pioneers community |
| B. | Climax community |
| C. | Top community |
| D. | Transient community |
| Answer» C. Top community | |
| 31. |
Disease in living organisms caused by parasites is called |
| A. | Parasitism |
| B. | Infestation |
| C. | Predation |
| D. | Infection |
| Answer» C. Predation | |
| 32. |
Legume plants are the hosts to |
| A. | Rhizobium |
| B. | Mycorrhiza |
| C. | Lichen |
| D. | Algae |
| Answer» B. Mycorrhiza | |
| 33. |
A dual organism composed of symbiotic association of an alga living within a fungus myceliium is |
| A. | Mycorrhiza |
| B. | Rhizobium |
| C. | Lichen |
| D. | Legume |
| Answer» D. Legume | |
| 34. |
Symbiosis relationship in which only one organism is benefited is |
| A. | Symbiosis |
| B. | Commensalism |
| C. | Mutualism |
| D. | Unism |
| Answer» C. Mutualism | |
| 35. |
Sharks may have small fish attached to them called |
| A. | Rumors |
| B. | Romas |
| C. | Romosis |
| D. | Remoras |
| Answer» E. | |
| 36. |
Over grazing leads to |
| A. | Good pastured lands |
| B. | Rocky areas |
| C. | Totally barren lands |
| D. | Salinity |
| Answer» D. Salinity | |
| 37. |
Nitrogen constitutes about ______ % of atmosphere |
| A. | 58% |
| B. | 25% |
| C. | 10% |
| D. | 78% |
| Answer» E. | |
| 38. |
Oxidation of ammonia or ammonium ions by bacteria in soil is called |
| A. | Nitrification |
| B. | Ammonification |
| C. | Assimilation |
| D. | Denitrification |
| Answer» B. Ammonification | |
| 39. |
Gross primary production is |
| A. | Amount of energy fixed by small plants |
| B. | Amount of energy fixed by large plants |
| C. | Total amount of energy fixed by all plants |
| D. | Primary production minus respiratory loss |
| Answer» D. Primary production minus respiratory loss | |
| 40. |
Plant biomass is |
| A. | Gross primary production |
| B. | Net primary production |
| C. | Gross primary production minus respiratory loss |
| D. | Both b and c |
| Answer» E. | |
| 41. |
Total solar energy trapped by the producers in an ecosystem is |
| A. | 95% |
| B. | 20% |
| C. | 78% |
| D. | 1% |
| Answer» E. | |
| 42. |
The major unit of ecology is |
| A. | Population |
| B. | Community |
| C. | Ecosystem |
| D. | Biome |
| Answer» D. Biome | |
| 43. |
Which of the following is not true for food web? |
| A. | Formed from food chain |
| B. | Complex than food chain |
| C. | Stable than food chain |
| D. | Starts with primary consumers |
| Answer» E. | |
| 44. |
Which one of the following is more tolerant to herbivore |
| A. | Grasses |
| B. | Trees |
| C. | Herbs |
| D. | None of these |
| Answer» B. Trees | |
| 45. |
Abiotic components include |
| A. | Atmosphere |
| B. | Hydrosphere |
| C. | Lithosphere |
| D. | All of these |
| Answer» E. | |
| 46. |
Sequence of changes in community and its non-living environment over a period of time is |
| A. | Niche |
| B. | Succession |
| C. | Alterations |
| D. | Neo-ecology |
| Answer» C. Alterations | |
| 47. |
Plants growing in xeric conditions are called |
| A. | Spherophytes |
| B. | Mesophytes |
| C. | Xerophytes |
| D. | Teridophytes |
| Answer» D. Teridophytes | |
| 48. |
Lichen and algae form |
| A. | Climax community |
| B. | Pioneers community |
| C. | Initiator community |
| D. | Seral community |
| Answer» C. Initiator community | |
| 49. |
Diverse and stable community at the end of succession is |
| A. | Climax community |
| B. | Pioneers community |
| C. | Top community |
| D. | Stable community |
| Answer» B. Pioneers community | |
| 50. |
Secondary succession starts from |
| A. | A bar rock sand |
| B. | Clear glacial pool |
| C. | From remains of previous ecosystem |
| D. | Fire |
| Answer» D. Fire | |