Ecology: energy flow — KCSE Biology

KCSE Biology · 79 practice questions · 3 syllabus objectives

24 easy35 medium20 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe the flow of energy through an ecosystem

Explain the 10% energy transfer rule between trophic levels

Ecology: energy flow

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easySHORT ANSWER3 marks

Explain the role of primary consumers (herbivores) in nutrient cycling in an ecosystem. (3 marks)

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Part (a) — 3 marks

Producers fix solar energy into organic compounds through photosynthesis, making it available to other organisms (1 mk)

They form the base of all food chains and food webs — the source of all chemical energy in the ecosystem (1 mk)

Without producers, no energy would enter the ecosystem and all life would cease (1 mk)

easySHORT ANSWER3 marks

Explain the role of producers (autotrophs) in energy flow in an ecosystem. (3 marks)

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Part (a) — 3 marks

Producers fix solar energy into organic compounds through photosynthesis, making it available to other organisms (1 mk)

They form the base of all food chains and food webs — the source of all chemical energy in the ecosystem (1 mk)

Without producers, no energy would enter the ecosystem and all life would cease (1 mk)

easySHORT ANSWER3 marks

Explain the role of producers (autotrophs) in energy transfer in an ecosystem. (3 marks)

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Part (a) — 3 marks

Producers fix solar energy into organic compounds through photosynthesis, making it available to other organisms (1 mk)

They form the base of all food chains and food webs — the source of all chemical energy in the ecosystem (1 mk)

Without producers, no energy would enter the ecosystem and all life would cease (1 mk)

Define the term 'trophic level' as it relates to energy flow in an ecosystem. (2 marks)