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3 marksTransport in the Phloem

CAPE Biology Unit 2 · May/June 2024 · Paper 2 · Question 2(b)(ii)

Sucrose is transported from regions in plants called sources to regions called sinks. The companion cells of the phloem are adapted for the loading of sucrose from the source.

A carrot is a taproot that can be used in vegetative propagation. Explain how a carrot can act both as a 'source' and a 'sink' at different times.

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Other parts of this question

  1. 2(a)(i)In the space provided below, draw FOUR adjoining xylem vessels as shown in Figure 4.[5 marks]
  2. 2(a)(ii)Complete Table 2 by stating how EACH of the named structural features of xylem vessels allows them to carry out water transport in a plant.[6 marks]
  3. 2(a)(iii)Describe how cohesion and capillarity aid in the ascent of water from stem to leaf.[4 marks]
  4. 2(b)(i)Explain how ONE structural feature of the companion cells enables them to carry out their role in sucrose transport.[3 marks]
  5. 2(c)Explain the differences between plant and mammalian transport systems as it relates to the following. You MUST present your response in complete paragraphs.…[9 marks]

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