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Photosynthesis (A-level only)

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Question 1
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A student extracted photosynthetic pigments from the leaves of a plant and separated them using paper chromatography.

A paper chromatogram showing a horizontal dashed line near the bottom labeled 'Origin'. Three spots are positioned vertically above the origin line: Spot A (highest), Spot B (middle), and Spot C (lowest). The measured distances from the origin to the center of each spot are: Spot A is 14.4 cm, Spot B is 9.6 cm, and Spot C is 4.8 cm.

1.

Explain why the student used a pencil to draw the origin line instead of ink.

[1]
2.

The student knows that Spot A has an RfR_fRf​ value of 0.900.900.90. Use this information and the diagram to calculate the RfR_fRf​ value of Spot B. Show your working.

[2]
3.

Explain the biological advantage to the plant of having multiple photosynthetic pigments of different colours.

[1]

Photosynthesis (A-level only) Questions

  1. A Level
  2. /Biology
  3. /Photosynthesis (A-level only)

Question bank