Question

Explain the method of testing a leaf for starch.

Answer 1

$\huge\textbf\green{Answer :}$



$\textbf{How to check the presence of starch in leaves ?}$


Take a potted plant and put in a dark room.

After sometime pluck a leave from the plant.

Then boil it in water for 5 min to soft it and after doing that place the leave in a test tube containing alcohol.

Place the test tube in a beaker containg water.

Then, genlty heat the beaker till the alcohol dissolves in the chrolophyll and the leaves loses its green colour.

Wash the leaf and Water.

After doing that place the leaf on a plate and add a few drops of iodine solution.

The parts that turn blue black show the presence of starch in a leaf.

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Answer 2

$<b><u>HEY MATE ✌$


First of all take a potted plant and put it inside a closed room containing no light and air. Few hours later pluck a leave from the plant. Boil that leaf in water for 5 - 10 mins to make it soft. Then place the leave in a test tube containing alcohol. Place that test tube in a beaker which contains water. Heat the beaker untill the alcohol dissolves in the chrolophyll and the leaves loses its green colour. Place the leaf on a dish and add a few drops of iodine solution.
The parts which turns into blu- black colour shows the presence of starch in a leaf.


HOPE IT HELPS....