Question

identifiers that starch is present in the green leaves​

Answer 1

Answer:

Iodine solution .

Iodine solution is used to test leaves for the presence of starch. You need to:

heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions)

heat it in boiling ethanol for a few minutes (this removes most of its colour)

wash with water and spread onto a white tile

add iodine solution from a dropping pipette

After a few minutes, the parts of the leaf that contain starch turn blue-black.

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Answer 2

Explanation:

The hot water kills the leaf and the alcohol breaks down the chlorophyll, taking the green color out of the leaf. When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish-brown. Iodine is an indicator that turns blue-black in the presence of starch. The leaf that was in the light turns blue-black, which demonstrates that the leaf has been performing photosynthesis and producing starch.

Try the test again with a variegated leaf (one with both green and white) that has been in the sunlight. A leaf needs chlorophyll to perform photosynthesis — based on that information, where on the variegated leaf do you think you would find starch?