Sample Questions — Energy flow
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MCQ
Why does no energy remain trapped indefinitely in any organism?
✅ Correct Answer: C
Energy is either transferred to the next trophic level or lost as heat; no energy remains indefinitely in an organism.
MCQ
Assertion (A): Pyramids of energy are always downwards.
Reason (R): Energy is lost as heat at every trophic level.
✅ Correct Answer: D
Pyramids of energy are always upright.
The irreversible loss of energy as heat ensures energy decreases at each level, keeping the pyramid upright.
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MCQ
Assertion (A): Only 10% of energy is transferred from one trophic level to the next.
Reason (R): A large amount of energy is lost as heat at each trophic level.
✅ Correct Answer: A
Energy transfer across trophic levels is inefficient due to heat loss, resulting in only 10% energy transfer.
MCQ
Which law of thermodynamics does energy loss as heat in ecosystems follow?
✅ Correct Answer: A
Ecosystems are not exempt from the Second Law of Thermodynamics.
MCQ
Which organisms break down detritus by secreting digestive enzymes?
✅ Correct Answer: B
Decomposers, also called saprotrophs, degrade detritus enzymatically.
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