Standard Science Primary 6 Energy

Ravi wants to prove that light is necessary for photosynthesis. He covers part of a leaf with black paper. After 48 hours, what should he use to test for the presence of starch?

A Benedict's solution
B Iodine solution
C Bromothymol blue
D Limewater
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Worked Solution

Step 1: The product of photosynthesis (glucose) is stored as starch. Step [2-9]: Iodine solution turns dark blue/black in the presence of starch. Step [2-9]: This confirms if photosynthesis occurred in the light vs dark areas.

Correct answer: Iodine solution

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