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