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1 markReproduction in Plants

CAPE Biology Unit 1 · May/June 2022 · Paper 2 · Question 3(a)(iii)

An experiment investigating the effect of varying glucose concentrations (0%, 0.002%, 0.02%, 0.2%) on the percentage germination of pollen grains in impatiens.

State ONE change in the experiment that could have overcome the error stated in (a)(ii).

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Other parts of this question

  1. 3(a)(i)State a suitable hypothesis for this experiment.[2 marks]
  2. 3(a)(ii)State ONE possible source of error in the experiment.[1 mark]
  3. 3(a)(iv)Identify ONE responding variable in the experiment.[1 mark]
  4. 3(b)(i)State the function of the Epidermis in the anther of a stamen.[1 mark]
  5. 3(b)(ii)State the function of the Tapetum in the anther of a stamen.[1 mark]
  6. 3(b)(iii)State the function of Pollen mother cells in the anther of a stamen.[1 mark]
  7. 3(b)(iv)Starting from the pollen mother cell, outline the steps in pollen grain formation.[3 marks]
  8. 3(b)(v)Explain the significance of double fertilization in the embryo sac of a flower.[3 marks]
  9. 3(c)Using the information given in the flow chart, outline how the body controls spermatogenesis in the human male.[4 marks]
  10. 3(d)(i)Using the information from Figure 6, discuss the effects of maternal smoking on foetal development. You must refer to Figure 6 in your discussion.[4 marks]
  11. 3(d)(ii)Discuss how TWO maternal behaviours, other than smoking, may contribute to low birth weight. You must include ONE lifestyle change that the physician may…[4 marks]

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