Which product of photosynthesis is iodine used to test for?
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Starch
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Water
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Oxygen
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Carbon Dioxide
A
Correct answer
Explanation
Glucose produced during photosynthesis is rapidly converted into starch for long-term storage in plant tissues. Iodine solution is a classic chemical indicator that turns from brown to blue-black in the presence of starch, confirming that photosynthesis has occurred.