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CHAPTER 36: Ecosystem

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Question 1 of 15

1. Question
The mass of living material at a trophic level at a particular time is called
- Net primary productivity
- Standing crop
- Gross primary productivity
- Standing state
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Question 2 of 15

2. Question
- 4
- 3
- 1
- 2
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Question 3 of 15

3. Question
- 4
- 3
- 2
- 1
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Question 4 of 15

4. Question
Which one of the following processes during decomposition is correctly described?
- Catabolism – Last step in the decomposition under fully anaerobic condition
- Leaching – Water soluble inorganic nutrients rise to the top layers of soil
- Fragmentation – Carried out by organisms such as earthworm
- Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate.
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Question 5 of 15

5. Question
Vertical distribution of different species occupying different levels in a biotic community is known as
- Zonation
- Pyramid
- Divergence
- Stratification
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Question 6 of 15

6. Question
Arrange the following ecosystems in increasing order of mean NPP (Tonnes / ha / year)

A.Tropical deciduous forest

B.Temperate coniferous forest

C.Tropical rain forest

D.Temperate deciduous forest
- B < A < D < C
- D < B < A < C
- A < C < D < B
- B < D < A < C
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Question 7 of 15

7. Question
How much portion of the Photosynthetically Active Radiation (PAR) is captured by the plants?
- 5 – 10%
- 7 – 10%
- 8 – 10%
- 2 – 10%
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Question 8 of 15

8. Question
Most of the desert plants bloom during night time because
- Their blooming is controlled by low temperature.
- They are sensitive to the phases of moon
- The desert insects eat away flowers during day time.
- The desert insects are active during night time.
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Question 9 of 15

9. Question
Which ecosystem has the maximum biomass?
- Grassland ecosystem
- Pond ecosystem
- Lake ecosystem
- Forest ecosystem
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Question 10 of 15

10. Question
During ecological succession
- The numbers and types of animals remain constant
- The changes lead to a community that is in near equilibrium with the environment and is called pioneer community
- The gradual and predictable change in species composition occurs in a given area
- The establishment of a new biotic community is very fast in its primary phase.
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Question 11 of 15

11. Question
The phosphorus cycle differs from the carbon cycle in that
- The phosphorus does not enter living organisms, whereas carbon does
- The phosphorus cycle does not include a gaseous phase, whereas the carbon cycle does
- The phosphorus cycle includes a solid phase, whereas the carbon cycle does not
- The primary reservoir of the phosphorus cycle is the atmosphere, whereas the primary reservoir for the carbon cycle is in rock
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Question 12 of 15

12. Question
- 4
- 1
- 2
- 3
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Question 13 of 15

13. Question
Which of the following is not true of a pyramid of productivity?
- Only about 10% of the energy in one trophic level is passed into the next level.
- Because of the loss of energy at each trophic level, most food chains are limited to three to five steps.
- The pyramid of productivity of some aquatic ecosystems is inverted because of the large zooplankton primary – consumer level.
- Eating grain-fed beef is an inefficient means of obtaining the energy trapped by photosynthesis.
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Question 14 of 15

14. Question
Which one of the following pairs is a sedimentary type of biogeochemical cycle ?
- Phosphorus and Carbon monoxide
- Oxygen and Nitrogen
- Phosphate and Nitrogen
- Phosphorus and Sulphur
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Question 15 of 15

15. Question
Consider the following statements concerning food chains

(i)Removal of 80% tigers from an area resulted in greatly increased growth of vegetation

(ii)Removal of most of the carnivores resulted in an increased population of deers

(iii)The length of food chains is generally limited to 3-4 trophic levels due to energy loss

(iv)The length of food chains may vary from 2 to 8 trophic levels

Which two of the above statement are correct ?
- ii and iii
- iii and iv
- i and iv
- i and ii
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