HOTS Science Primary 6 Energy

In an experiment, a leaf was covered with black paper as shown. After 24 hours in sunlight, which part of the leaf will turn dark blue when tested with iodine?

A No part of the leaf.
B The part covered with black paper.
C The whole leaf.
D The part not covered with black paper.
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Worked Solution

Step 1: Iodine tests for starch. Starch turns dark blue. Step [2-9]: Starch is produced via photosynthesis, which requires light. Step [2-9]: The covered part had no light, so no starch was made. The uncovered part made starch.

Correct answer: The part not covered with black paper.

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