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8 marksEnergy Flow and Nutrient Cycling

CAPE Biology Unit 2 · May/June 2019 · Paper 2 · Question 1(a)(iii)

The initial energy that enters ecosystems is from the sun. Figure 1 illustrates the flow of energy and nutrients through ecosystems.

Explain why only a small percentage of the energy from sunlight that reaches terrestrial environments enters the ecosystem.

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Other parts of this question

  1. 1(a)(i)Illustrate the flow of energy and nutrients through ecosystems by providing labels for A-F in the flow chart in Figure 1.[5 marks]
  2. 1(a)(ii)Explain the importance of energy flow in an ecosystem.[4 marks]
  3. 1(b)(i)Complete the diagram in Figure 2 and include labels to illustrate the structure of a mitochondrion.[5 marks]
  4. 1(b)(ii)Explain how the structure of the mitochondrion is important for its function in respiration.[8 marks]

More practice: the rest of this paper · more Energy Flow and Nutrient Cycling questions · all CAPE Biology Unit 2 past papers