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7 marksNutrition in Living Organisms

CSEC Biology · May/June 2011 · Paper 2 · Question 4(b)(i)

Students investigated if chlorophyll is needed for photosynthesis. They used a de-starched, variegated plant, left it in sunlight, then tested one leaf for starch. The student drew the leaf before the starch test.

Make a large, clearly labelled drawing to show the distribution of green and non-green areas of one leaf that the student may have used.

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Other parts of this question

  1. 4(a)Describe TWO ways in which a leaf is adapted for the process of photosynthesis.[2 marks]
  2. 4(b)(ii)Indicate, on the same drawing, the part expected to change colour if the leaf had photosynthesized.[1 mark]
  3. 4(b)(iii)Describe the colour change expected if the leaf tested positive for starch.[1 mark]
  4. 4(c)Explain how this investigation could indicate that chlorophyll is needed for photosynthesis. Include the role of chlorophyll in your explanation.[4 marks]
  5. 4(d)Give an explanation for the presence of starch in the parts of a plant that do NOT contain chlorophyll.[2 marks]

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