Question

Before testing the leaf for starch at the end of the experiment "Light is necessary for photosynthesis":
(a) In which liquid the leaf should be boiled?
(b) Why should the leaf be boiled in this liquid?​

Answer 1

Answer:

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.

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Answer 2

Answer:

a..heat it in boiling ethanol(alcohol) for a few minutes

b..The hot water kills the leaf and the alcohol(ethanol) 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.