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2 marksIrritability and Response

CSEC Biology · January 2010 · Paper 2 · Question 1(c)(i)

Plants also have mechanisms for responding to the environment. Figure 2 shows a plant's response to sunlight.

How does the response shown in Figure 2 benefit the plant?

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 1(a)In the space provided, produce a diagram to show how the apparatus in Figure 1 could have been set up for this investigation.[4 marks]
  2. 1(b)(i)Complete Table 1 by calculating the total and percentage of larvae on the dark side and the light side of the petri dish. Write your answer in Table 1.[2 marks]
  3. 1(b)(ii)Do the results of this investigation support the student's hypothesis? Give a reason for your answer.[2 marks]
  4. 1(b)(iii)Name TWO factors OTHER THAN light that could have influenced the larvae's response.[2 marks]
  5. 1(b)(iv)Describe how the apparatus shown in (a) could be modified to investigate ONE of the factors named in (b) (iii).[2 marks]
  6. 1(b)(v)Explain how the response shown by the larvae in this experiment could help them to survive in their natural environment.[2 marks]
  7. 1(c)(ii)Describe an experiment to determine whether a leaf on a potted plant has been photosynthesizing.[3 marks]
  8. 1(c)(iii)Name TWO conditions OTHER THAN light, that are necessary for photosynthesis.[2 marks]
  9. 1(d)(i)Why is this an important step in the investigation?[2 marks]
  10. 1(d)(ii)Explain why the response to gravity is essential for plant survival.[2 marks]

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