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1 markNutrition in Living Organisms

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

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.

Describe the colour change expected if the leaf tested positive for starch.

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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)(i)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.[7 marks]
  3. 4(b)(ii)Indicate, on the same drawing, the part expected to change colour if the leaf had photosynthesized.[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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