Quelpr
1 markTransport in the Phloem

CAPE Biology Unit 2 · 2004 · Paper 2 · Question 2(a)

An examination of phloem structure and transport, as well as transpiration and water uptake rates in a mango tree.

Name the cells labelled A in Figure 2.

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Other parts of this question

  1. 2(b)Suggest the effect on the phloem if the cells labelled A in Figure 2 were killed.[1 mark]
  2. 2(c)Determine the average diameter of the pores in the sieve plate in Figure 2.[1 mark]
  3. 2(d)(i)With reference to Figure 3, relate water uptake in the mango tree to the time of day.[1 mark]
  4. 2(d)(ii)With reference to Figure 4, relate transpiration rate in the mango tree to the time of day.[2 marks]
  5. 2(d)(iii)Deduce why the graph in Figure 3, showing water uptake in the mango tree, lags in time behind the graph showing transpiration rate in Figure 4.[2 marks]
  6. 2(d)(iv)What is the rate of transpiration of the tree when its water uptake is 22 grams?[1 mark]
  7. 2(d)(v)Suggest the purpose for which the excess water that is retained by the mango tree is used.[1 mark]

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