Q. No.The ultimate source of energy for ecosystems is:
1. Soil nutrients
2. Solar energy
3. Water
4. Organic matter
1. Soil nutrients
2. Solar energy
3. Water
4. Organic matter
Subtopic: Ecosystem Productivity | Energy Flow |
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Which of the following shows the correct flow of energy through ecosystems?
1. sun → primary consumer → secondary consumer → producer
2. sun → producer → secondary consumer → primary consumer
3. sun → secondary consumer → primary consumer → producer
4. sun → producer → primary consumer → secondary consumer
1. sun → primary consumer → secondary consumer → producer
2. sun → producer → secondary consumer → primary consumer
3. sun → secondary consumer → primary consumer → producer
4. sun → producer → primary consumer → secondary consumer
Subtopic: Energy Flow |
98%
Level 1: 80%+
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A complex of interconnected food chains in an ecosystem is called a(an)
1. ecosystem
2. pyramid of numbers
3. pyramid of biomass
4. food web
1. ecosystem
2. pyramid of numbers
3. pyramid of biomass
4. food web
Subtopic: Energy Flow |
96%
Level 1: 80%+
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According to energy law of Lindemann, only ___% of the energy is transferred to a trophic level
from the lower trophic level.
(1) 1
(2) 10
(3) 5
(4) 90
Subtopic: Energy Flow |
96%
Level 1: 80%+
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Why is the number of trophic levels in the grazing food chain restricted in nature?
| 1. | Energy transfer between trophic levels is 100%, allowing only a limited number of levels. |
| 2. | Only 10% of the energy is transferred to the next trophic level, limiting the energy available for higher levels. |
| 3. | Producers are insufficient to support a large number of trophic levels. |
| 4. | Predators at higher trophic levels prevent the formation of additional levels. |
Subtopic: Energy Flow |
95%
Level 1: 80%+
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The detritus food chain begins with
| 1. | Living plants | 2. | Dead organic matter |
| 3. | Herbivores | 4. | Carnivores |
Subtopic: Energy Flow |
94%
Level 1: 80%+
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Why is the flow of energy in an ecosystem considered unidirectional?
| 1. | Energy is lost as heat at each trophic level and cannot return to lower levels. |
| 2. | Energy moves back and forth between trophic levels indefinitely. |
| 3. | Producers recycle energy from consumers repeatedly. |
| 4. | Decomposers convert heat back into chemical energy. |
Subtopic: Energy Flow |
93%
Level 1: 80%+
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Consider the given two statements:
| Assertion (A): | The number of trophic levels in the grazing food chain is restricted. |
| Reason (R): | The transfer of energy follows the 50 per cent law, meaning only 50% of the energy is passed from one trophic level to the next. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Energy Flow |
93%
Level 1: 80%+
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Which of the following is a primary consumer in maize field ecosystem?
1. Grasshopper
2. Wolf
3. Phytoplankton
4. Lion
Subtopic: Energy Flow |
93%
Level 1: 80%+
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Of the total incident solar radiation the proportion of PAR is
1. about 70%
2. about 60%
3. less than 50%
4. more than 80%
Subtopic: Energy Flow |
93%
Level 1: 80%+
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