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1 markIrritability and Response

CSEC Biology · May/June 2013 · Paper 2 · Question 2(b)(ii)

Statements A and B below describe two different examples of plant movement. A. The roots of seedlings grow downwards in the soil. B. The shoots of cucumber seedlings grow towards light coming through an open window.

Name the hormone responsible for the response of the cucumber seedlings in B.

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Other parts of this question

  1. 2(a)On Figure 2, write the name of the part and use a label line to identify EACH of the following parts of the eye: (i) The light sensitive layer (ii) The…[4 marks]
  2. 2(b)(i)Name the stimulus for EACH set of seedlings. Seedlings in A Seedlings in B[2 marks]
  3. 2(b)(iii)Suggest how the types of movement described in A and B may be useful to the seedlings.[2 marks]
  4. 2(c)Describe ONE similarity and ONE difference between the response of soil invertebrates and the response of the cucumber seedlings in B. Similarity Difference[4 marks]
  5. 2(d)Outline TWO ways in which the nervous system functions differently from the endocrine system in humans.[2 marks]

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