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NCERT Solutions for Class 12 Biology Chapter 14
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NCERT Solutions for Class 12 Biology Chapter 14
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98 BIOLOGY, EXEMPLAR PROBLEMSCHAPTER 14
ECOSYSTEM
MULTIPLE-CHOICE QUESTIONS
1. Decomposers like fungi and bacteria are:
i. autotrophs
ii. heterotrophs
iii. saprotrophs
iv. chemo-autotrophs.
Choose the correct answer:
(a) i and iii, (b) i and iv (c) ii and iii, (d) i and ii
2. The process of mineralisation by micro organisms helps in the release of:
a. inorganic nutrients from humus
b. both organic and inorganic nutrients from detritus
c. organic nutrients from humus
d. inorganic nutrients from detritus and formation of humus.
3. Productivity is the rate of production of biomass expressed in terms of:
i. (kcal m–3) yr–1
ii. g–2 yr–1
iii. g–1 yr–1
iv. (kcal m–2) yr–1
(a) ii, (b) iii, (c) ii and iv, (d) i andiii
4. An inverted pyramid of biomass can be found in which ecosystem?
a. Forest
b. Marine
c. Grass land
d. Tundra
, ECOSYSTEM 99
5. Which of the following is not a producer?
a. Spirogyra
b. Agaricus
c. Volvox
d. Nostoc
6. Which of the following ecosystems is most productive in terms of net
primary production?
a. Deserts
b. Tropical rain forests
c. Oceans
d. Estuaries
7. Pyramid of numbers is:
a. Always upright
b. Always inverted
c. Ether upright or inverted
d. Neither upright nor inverted.
8. Approximately how much of the solar energy that falls on the leaves of a
plant is converted to chemical energy by photosynthesis?
a. Less than 1%
b. 2-10%
c. 30%
d. 50%
9. Among the following, where do you think the process of decomposition
would be the fastest?
a. Tropical rain forest
b. Antarctic
c. Dry arid region
d. Alpine region
10. How much of the net primary productivity of a terrestrial ecosystem is
eaten and digested by herbivores?
a. 1%
b. 10%
c. 40%
d. 90%
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