CAIE IGCSE Biology 6.1.7 Testing Photosynthesis Requirements

Practise designing controlled tests for light, chlorophyll or carbon dioxide, using destarched plants, comparison regions and iodine results to judge starch production.

Exam points

predict that only uncovered green regions of a variegated leaf contain starch after exposure to light
interpret blue-black iodine staining as evidence of starch in illuminated chlorophyll-containing tissue

[Maximum number: 1]

A plant with variegated leaves was placed in a dark cupboard for 48 hours so that all the starch was removed from the leaves. The variegated leaves have green parts and white parts.

Black paper was then fixed on one leaf and the plant was exposed to the light.
After 24 hours, which region of the leaf contained starch?

Figure for Question 6.1.7—Need for chlorophyll, light and carbon question 1 — CAIE IGCSE Biology

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6.1.7—Need for chlorophyll, light and carbon question 1