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Q. No.The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called:
1. Secondary production
2. Primary production
3. Gross primary production
4. Net primary production
Subtopic: Ecosystem Productivity |
57%
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Read the following statements and select the correct option.
1. Only statement A is correct
2. Only statement B is correct
3. Both statements A and B are correct
4. Both statements A and B are incorrect
| Statement A: | Detritus is raw material for decomposition. |
| Statement B: | Detritus food chain does not involve autotrophs. |
2. Only statement B is correct
3. Both statements A and B are correct
4. Both statements A and B are incorrect
Subtopic: Decomposition |
59%
From NCERT
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Most ecosystems would vanish if the sun were not, continuously, providing energy to the Earth. |
| Reason (R): | Ecosystems and living organisms defy second law of thermodynamics. |
| 1. | Both (A) and (R) are True but (R) does not explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) explains (A). |
Subtopic: Energy Flow |
62%
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Which of the following is not correct regarding the decomposition of wastes?
| (a) | Low temperature inhibits decomposition |
| (b) | Warm and moist environment favors the process |
| (c) | The process is anaerobic |
| (d) | It is slower if detritus is rich in proteins and carbohydrates |
| (e) | Detritus is degraded into simpler inorganic substance by fungal and bacterial enzymes |
Choose the correct answer from the options given below:
| 1. | (b) and (c) only | 2. | (c), (a) and (d) only |
| 3. | (c) and (d) only | 4. | (c), (d) and (e) only |
Subtopic: Decomposition |
63%
From NCERT
NEET - 2022
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Consider the given two statements:
| Assertion (A): | Heterotrophs generally have high energy conversion efficiencies when compared to those of plants. |
| Reason (R): | At higher trophic levels, the respiratory costs are dramatically reduced. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (R) |
| 3. | Both (A) and (R) are True and but (R) does not correctly explain (A) |
| 4. | Both (A) and (R) are False |
Subtopic: Energy Flow |
52%
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The net primary productivity of oceans is about:
| 1. | 25 % of the annual net primary productivity of the whole biosphere |
| 2. | 33 % of the annual net primary productivity of the whole biosphere |
| 3. | 66 % of the annual net primary productivity of the whole biosphere |
| 4. | 70 % of the annual net primary productivity of the whole biosphere |
Subtopic: Ecosystem Productivity |
58%
From NCERT
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Regarding energy flow in an ecosystem:
| 1. | About 2 to 10 % of incident solar radiation is PAR |
| 2. | An ecosystem is exempt from the Second Law of Thermodynamics |
| 3. | The amount of energy increases at successive trophic levels |
| 4. | The number of trophic levels in a grazing food chain is limited |
Subtopic: Energy Flow |
54%
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During the decomposition of detritus, the correct chronological sequence of steps involved is:
| 1. | Fragmentation → Leaching → Catabolism |
| 2. | Catabolism → Leaching → Fragmentation |
| 3. | Leaching → Fragmentation → Catabolism |
| 4. | There is no sequence as all steps occur simultaneously |
Subtopic: Decomposition |
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After the primary producer level in an ecosystem:
| 1. | less and less amount of new chemical energy is added at successive trophic levels |
| 2. | no new chemical energy is added at successive trophic levels |
| 3. | more and more amount of new chemical energy is added at successive trophic levels |
| 4. | less amount of new chemical energy is added at primary consumer level and then the amount of new chemical energy added to successive levels becomes more and more |
Subtopic: Energy Flow |
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Which of the following ecosystems are expected to have the least productivity?
1. Tundras
2. Tropical rain forests
3. Open oceans
4. Swamps and marshes
1. Tundras
2. Tropical rain forests
3. Open oceans
4. Swamps and marshes
Subtopic: Ecosystem Productivity |
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