The steps below are involved in the testing of a leaf for starch. Study them carefully and answer the question:
I. Decolorize them
II. Dip decolorized leaf in warm water
III. Place leaf in boiling water
IV. Add iodine solution
The best time to pluck the leaf for the experiment is?
-
after being exposed to sunlight
- three hours after sunset
- before sunrise
- six hours after sunset
The correct answer is: A
Explanation
The leaf that was in the light turns blue-black, which demonstrates that the leaf has been performing photosynthesis and producing starch.