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2 marksReproduction in Plants

CAPE Biology Unit 1 · 2017 · Paper 2 · Question 3(a)(ii)

An experiment investigates the effects of culture medium type (liquid vs. solid) and sucrose concentration on palm pollen germination rate. Pollen grains are inoculated into media with varying sucrose concentrations. Results are in Table 3.

Briefly describe the overall trend for the effect of different sucrose concentrations, in both culture media, on the germination rate of the palm pollen.

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Other parts of this question

  1. 3(a)(i)On the grid provided in Figure 4, plot line graphs for the data given in Table 3.[4 marks]
  2. 3(a)(iii)Based on the results shown in Table 3, what can be deduced about the effect of the type of culture medium on the maximum rate of pollen germination?[2 marks]
  3. 3(b)(i)Identify and describe the main function of EACH of the structures labelled I, II and III.[3 marks]
  4. 3(b)(ii)Comment on TWO roles of the structure labelled Y in the development of the foetus.[2 marks]
  5. 3(b)(iii)Outline TWO ways in which the placenta acts as a protective barrier for the developing foetus.[2 marks]

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