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4 marksIrritability and Response

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

Both plants and animals respond to stimuli. Figure 2 is a diagram of the human eye.

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 jelly-like substance that keeps the eye in shape (iii) Carries nerve impulses to the brain (iv) Controls the shape of the lens

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Other parts of this question

  1. 2(b)(i)Name the stimulus for EACH set of seedlings. Seedlings in A Seedlings in B[2 marks]
  2. 2(b)(ii)Name the hormone responsible for the response of the cucumber seedlings in B.[1 mark]
  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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