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4 marksTransport in the Phloem

CAPE Biology Unit 2 · 2010 · Paper 2 · Question 2(c)(ii)

Figure 3 shows an electron micrograph of a plant vascular tissue structure.

Discuss TWO structural differences between the cells labelled X and Y and describe how, in spite of these differences, they function as a unit.

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Other parts of this question

  1. 2(a)(i)Explain FOUR precautions that should be taken when setting up and conducting this experiment.[4 marks]
  2. 2(a)(ii)From which leaf surface will the water loss most likely be GREATER?[1 mark]
  3. 2(a)(iii)Suggest an appropriate control for the experiment.[1 mark]
  4. 2(b)Identify THREE factors that affect the closing and opening of stomata, and explain how these factors function.[3 marks]
  5. 2(c)(i)Identify the structures labelled X and Y in Figure 3.[1 mark]
  6. 2(c)(iii)Name ONE route by which substances move from the chloroplast in leaves to the phloem.[1 mark]

More practice: the rest of this paper · more Transport in the Phloem questions · all CAPE Biology Unit 2 past papers