Welcome to your Ecosystem MCQs Mock Test of Class 12th Biology
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Q1. Which of the following ecosystems is most productive in terms of net primary production?
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Q2. The reservoir for the gaseous type of biogeochemical cycle exists in
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Q3. About 71 % of total global carbon is found in
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Q4. The second stage of hydrosere is occupied by plants like
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Q5. River water deposits
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Q6. Which of the following is not a producer?
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Q7. Which of the following statements is correct for secondary succession?
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Q8. The common nitrogen-fixer in paddy fields is
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Q9. The process of mineralisation by micro organisms helps in the release of:
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Q10. In a pond ecosystem, the food chain starts with
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Q11. In lithosere, foliose lichens make the conditions favourable for the growth of
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Q12. Flow of energy in our ecosystem takes place
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Q13. An inverted pyramid of biomass can be found in which ecosystem?
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Q14. Which of the following is a pioneer species in xerarch succession?
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Q15. The rate of conversion of light energy into chemical energy of organic molecules in an ecosystem is
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Q16. The rate of formation of new organic matter by rabbit in a g rassland, is called
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Q17. Breakdown of detritus by microbial enzymes into simple forms is called?
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Q18. In a biotic community, the most important factor for survival of an animal is
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Q19. The reservoir for the gaseous type of bio-geochemical cycle exists in
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Q20. Edaphic factor refers to
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Q21. Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?
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Q22. Which of the following types of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100 mm.
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Q23. Term ‘ecosystem’ was coined by
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Q24. Which of the following is the most stable ecosystem?
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Q25. Pyramid of numbers is:
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Q26. Which of the following ecosystems is most productive in terms of net primary production?
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Q27. What percentage of total global carbon is atmospheric carbon ?
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Q28. Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
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Q29. Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
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Q30. Climax community is in a state of
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Q31. The pyramid which cannot be inverted in a stable ecosystem is that of
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Q32. How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
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Q33. Vertical distribution of different species occupying different levels in dense vegetation is called
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Q34. Which one of the following ecosystem types has the highest annual net primary productivity?
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Q.35. Pioneer community established on a bare rock is:
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Q.36. In gaseous cycle:
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Q.37. Carbon constitutes of dry weight of organism and _ percentage is present in oceans out of total global carbon
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Q.38. Choose incorrect option for the cost distribution of ecosystem services:
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Q.39. Succession proceeds from:
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Q.40. Hydrosphere is composed of abiotic and biotic components present in:
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Q.41. Which of the following represents largest man made ecosystem?
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Q.42. Vertical distribution of different species occupying different levels represents:
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Q.43. Rate of production of organic matter by producers per unit time and area is:
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Q.44. Natural scavengers are:
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Q.45. For which of the following ecosystem pyramid of number can be both spindle shape and inverted?
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Q.46. Buildup of organic material in soil is under which of the following conditions?
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Q.47. Humification results in the formation of ___________ substance
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Q.48. What percentages of PAR can be captured by plants?
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Q.49. Trees → Birds → Lice → Bacteria. The above food chain is:
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Q.50. Choose odd one out w.r.t. trophic level.
