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2 marksIrritability and Response

CSEC Biology · January 2013 · Paper 2 · Question 3(c)(ii)

Plants also produce hormones in the tip of their shoots that help them to respond to external stimuli such as light. Figure 3 illustrates an experiment to investigate a shoot's response to light.

Explain how the hormone causes the response shown in Figure 3B.

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Other parts of this question

  1. 3(a)(i)Use a label line in Figure 2 to illustrate the position of the Adrenals endocrine gland.[1 mark]
  2. 3(a)(ii)Use a label line in Figure 2 to illustrate the position of the Thyroid gland endocrine gland.[1 mark]
  3. 3(a)(iii)Use a label line in Figure 2 to illustrate the position of The pituitary gland endocrine gland.[1 mark]
  4. 3(b)(i)Name TWO hormones produced by the pituitary gland and state the role of EACH.[4 marks]
  5. 3(b)(ii)Suggest TWO effects of a poorly developed pituitary gland in humans.[2 marks]
  6. 3(c)(i)a)Figure 3A shows a shoot growing in sunlight. Complete Figure 3B to show the response of the shoot to light coming from only one direction.[1 mark]
  7. 3(c)(i)b)Complete Figure 3B to show the distribution of the hormone responsible for the response shown in your drawing in B.[1 mark]
  8. 3(c)(iii)Suggest why this response to light is important to the survival of the plant.[2 marks]

More practice: the rest of this paper · more Irritability and Response questions · all CSEC Biology past papers