NCERT Exemplar MCQ
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Question 1 of 11
1. Question
Decomposers like fungi and bacteria are
i. Autotrophs ii. Heterotrophs
iii. Saprotrophs iv. Chemo-autptrophsChoose the correct answer:
CorrectIncorrectHint
(c) Decomposers like fungi and bacteria are heterotrophs and saprotrophs.
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Question 2 of 11
2. Question
The process of mineralisation by micro organisms helps in the release of
CorrectIncorrectHint
(a)
– The process of mineralisation by microorganisms helps in the release of inorganic nutrients from humus.
– The humus is further degraded by some microbes and release of inorganic nutrients occur by the process called mineralisation. -
Question 3 of 11
3. Question
Productivity is the rate of production of biomass expressed in terms of:
i. \(\left(\mathrm{kcal} \mathrm{~m}^{-3}\right) \mathrm{yr}^{-1}\)
ii. \(\mathrm{g}^{-2} \mathrm{yr}^{-1}\)
iii. \(\quad g^{-1} \mathrm{yr}^{-1}\)
iv. \(\quad\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)CorrectIncorrectHint
(c) The rate of synthesis of energy containing organic matter or biomass by any trophic level per unit area in unit time is described as its productivity. It is measured as weight (e.g., \(\mathrm{g} / \mathrm{m}^2 / \mathrm{yr}\) ) or energy (e.g., \(\mathrm{Kcal} / \mathrm{m}^2 / \mathrm{yr}\) ).
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Question 4 of 11
4. Question
An inverted pyramid of biomass can be found in which ecosystem?
CorrectIncorrectHint
(b) In terrestrial ecosystem pyramid of biomass is generally upright. The pyramid of biomass in sea or lake is generally inverted because the biomass of fishes for exceeds that of phytoplankton.
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Question 5 of 11
5. Question
Which of the following is not a producer?
CorrectIncorrectHint
(b) Spirogyra, Volvox and Nostoc are producers. Agaricus is a fungus.
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Question 6 of 11
6. Question
Which of the following ecosystems is most productive in terms of net primary production?
CorrectIncorrectHint
(b) Tropical rain forests ecosystems is most productive in terms of net primary production.
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Question 7 of 11
7. Question
Pyramid of numbers is
CorrectIncorrectHint
(c) Pyramid of number in grassland or forest or pond ecosystem is upright. In parasitic food chain, the pyramid of number is inverted. In an ecosystem dominated by trees, the pyramid of number is spindle shaped/inverted.
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Question 8 of 11
8. Question
Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
CorrectIncorrectHint
(b) Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis 2-10 %.
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Question 9 of 11
9. Question
Among the following, where do you think the process of decomposition would be the fastest?
CorrectIncorrectHint
(a)
– Warm and moist environment favour decomposition. Decomposition is largely an oxygen requiring process. Low temperature and anaerobiosis inhibit decomposition resulting in build up of organic materials.
– The process of decomposition would be the fastest is tropical rain forest. -
Question 10 of 11
10. Question
How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
CorrectIncorrectHint
(b) 10 % of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores.
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Question 11 of 11
11. Question
If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be.
CorrectIncorrectHint
(c)
