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3 marksTransport in the Phloem

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

Plants have co-transporter proteins in cell membranes that move two molecules simultaneously. One molecule moves down its concentration gradient, releasing energy to transport the other molecule against its concentration gradient.

Explain how the sieve elements of the phloem are loaded with solutes against a concentration gradient.

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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(c)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…[12 marks]

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