Select Question Set:
Q. No.The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is:
1. Primary production
2. Primary productivity
3. Secondary production
4. Secondary productivity
Subtopic: Ecosystem Productivity |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Consider the two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Gross primary productivity (GPP) minus respiration losses (R), is the net primary productivity (NPP). |
| Statement II: | GPP is available for consumption by herbivores. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Ecosystem Productivity |
79%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
The annual net primary productivity of the whole biosphere is approximately:
1. 170 billion tons (fresh weight) of organic matter.
2. 170 billion tons (dry weight) of organic matter.
3. 115 billion tons (dry weight) of organic matter.
4. 55 billion tons (fresh weight) of organic matter.
1. 170 billion tons (fresh weight) of organic matter.
2. 170 billion tons (dry weight) of organic matter.
3. 115 billion tons (dry weight) of organic matter.
4. 55 billion tons (fresh weight) of organic matter.
Subtopic: Ecosystem Productivity |
87%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
What is the fate of the vast majority of energy entering into an ecosystem?
1. it gets converted into biomass by plants.
2. it gets utilized by secondary consumers.
3. it is lost as heat.
4. it gets used by the primary consumers.
1. it gets converted into biomass by plants.
2. it gets utilized by secondary consumers.
3. it is lost as heat.
4. it gets used by the primary consumers.
Subtopic: ECOSYSTEM – STRUCTURE AND FUNCTION |
70%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Detritus:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | is dead plant remains such as leaves, bark, flowers and dead remains of animals, including fecal matter. |
| II: | is the raw material for decomposition. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Decomposition |
96%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Consider the two statements:
| Assertion (A): | Detritivores play an important role as recyclers in the ecosystem's energy flow and biogeochemical cycles. |
| Reason (R): | Detritivores, alongside decomposers, reintroduce vital elements such as carbon, nitrogen, back into the soil, allowing plants to take in these elements and use them for growth. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Decomposition |
93%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
The correctly matched pairs regarding decomposition include:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Fragmentation | Detritivores break down detritus into smaller particles. |
| II: | Leaching | Water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. |
| III: | Catabolism | Bacterial and fungal enzymes degrade detritus into simpler inorganic substances. |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Decomposition |
89%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Humus:
| 1. | is formed by humification of detritus as the first step of decomposition in an ecosystem. |
| 2. | is highly prone to rapid microbial action. |
| 3. | serves as a reservoir of nutrients. |
| 4. | is never degraded further in an ecosystem. |
Subtopic: Decomposition |
84%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | In a particular climatic condition, decomposition rate is quicker if detritus is rich in lignin and chitin, and slower, if detritus is rich in nitrogen and water-soluble substances like sugars. |
| Statement II: | Warm and moist environment favour decomposition whereas low temperature and anaerobiosis inhibit decomposition. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Decomposition |
91%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Sun is the only source of energy for all ecosystems on earth except for:
1. Mangroves
2. Deserts
3. Deep sea hydrothermal vents
4. Tundra
1. Mangroves
2. Deserts
3. Deep sea hydrothermal vents
4. Tundra
Subtopic: Ecological Flow |
97%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Select Question Set:
© 2025 GoodEd Technologies Pvt. Ltd.