Question

A leaf was taken out from a potted plant kept in a dark room for few
weeks. The leaf was placed in a test tube containing alcohol. Then the
test tube was put in a beaker filled with water and heated. Which among
the following will be the correct observation?

(a) The colour of the leaf changes to blue-black.
(b) The leaf appears colourless.
(c) The leaf retains the green colour.
(d) The colour of the leaf changes to brick-red.

Answer 1

Answer:

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.

Option A is correct