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12 marksTransport in the Phloem

CAPE Biology Unit 2 · May/June 2021 · Paper 2 · Question 2(c)

Figure 4 illustrates the movement of substances through the phloem and xylem.

Discuss the mass flow theory as a mechanism of sugar transport in the phloem. Your response must include the processes labelled 1-7 and the movement of substances as indicated by the arrows.

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Other parts of this question

  1. 2(a)(i)In the space below, construct an annotated diagram of the motor neuron provided in Figure 3. Show the magnification of your drawing.[5 marks]
  2. 2(a)(ii)State the TWO main functions of synapses.[2 marks]
  3. 2(a)(iii)Outline the sequence of events that occurs when an action potential reaches a synapse.[6 marks]
  4. 2(b)(i)Differentiate between the 'source' and 'sink' in relation to phloem transport.[2 marks]
  5. 2(b)(ii)Explain how the sieve elements of the phloem are loaded with solutes against a concentration gradient.[3 marks]

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