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6 marksBiological and Physiological Principles in Agriculture

CAPE Agricultural Science Unit 1 · 2016 · Paper 2 · Question 1(a)(ii)

Figure 1 illustrates an active transport cycle involving ion binding, ATP hydrolysis, and release across a membrane.

Describe the sequential events occurring at stages 1, 2, 3, 4, 5, and 6 in Figure 1.

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Other parts of this question

  1. 1(a)(i)Identify the active transport mechanism illustrated in Figure 1.[1 mark]
  2. 1(b)(i)State the name of the photosynthetic process taking place in the stroma of the chloroplast.[1 mark]
  3. 1(b)(ii)Distinguish between cyclic and noncyclic photophosphorylation.[2 marks]
  4. 1(b)(iii)Provide a brief explanation of why the Calvin cycle requires ATP and CO2.[2 marks]
  5. 1(c)(i)Explain why the rate of photosynthesis is higher in C4 plants compared to C3 plants.[2 marks]
  6. 1(c)(ii)Explain why C4 plants exhibit higher water use efficiency than C3 plants under conditions of high temperature and high light intensity.[1 mark]

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