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Nutrition

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Question 23

During photosynthesis, plants absorb light energy and convert simple inorganic molecules into complex organic compounds.

a.

Describe three ways in which the cellular layout of the upper tissues of a leaf is adapted to maximize the capture of light energy.

[3]
b.

Write the balanced chemical equation for the synthesis of glucose in green plants.

[2]
c.

An experiment is designed using a green leaf partially covered with a strip of black, lightproof paper to demonstrate that light is required for photosynthesis.

Explain how the investigator can ensure the leaf contains no pre-existing starch before the black paper is applied.

[1]
d.

Identify the control region of the leaf in this investigation.

[1]
e.

Describe the method to test this leaf for the presence of starch at the end of the experiment. State any necessary safety precautions and the expected visual results for both the covered and uncovered regions.

[3]

Nutrition Questions

  1. IGCSE
  2. /Biology
  3. /Nutrition