CAIE IGCSE Biology 6.1.7 Need for Chlorophyll Light and Carbon Questions

Practise using starch tests and controlled comparisons to investigate whether light, chlorophyll and carbon dioxide are needed for photosynthesis.

Exam points

Use controlled comparisons to test whether light and chlorophyll are required for starch production.
Use iodine results to identify starch as evidence of photosynthesis.
Identify carbon dioxide as a requirement for photosynthesis.

[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?

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CAIE IGCSE Biology 6.1.7 Need for Chlorophyll Light and Carbon Questions question 1