Class 12 Biology · Chapter 13 · Test 2
Energy Flow and Population
38 MCQs
38 questions · 35 min · 38 marks
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Sample questions
The first 5 of 38. Try each one, then tap to see the answer.
Question 1
In an ecosystem the energy flow is:
- AAlways unidirectional
- BAlways bidirectional
- CNon-directional
- DCyclic
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Answer: A
Unlike matter energy flows in one direction only and is lost as heat.
Question 2
A population's carrying capacity:
- ACan be accurately calculated
- BGenerally, remains constant over time
- CMay change as environmental conditions change
- DCan never be exceeded
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Answer: C
Carrying capacity depends on limiting factors that change with the environment.
Question 3
During energy flow in ecosystems how much of the energy at a trophic level enters the next level?
- A100%
- B50%
- C25%
- D10%
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Answer: D
Only about 10% of energy is transferred to the next trophic level.
Question 4
Trophic level 1 consists of:
- AProducers
- BHerbivores
- CCarnivores
- DDecomposers
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Answer: A
Green plants algae and photosynthetic bacteria are primary producers.
Question 5
Primary consumers are:
- AHerbivores
- BCarnivores
- CProducers
- DDecomposers
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Answer: A
They feed directly on producers such as insects and rabbits.
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