Question

how will you test a leaf for starch?Mention any precaution you will take.

Answer 1

Iodine is used to test a leaf for starch.
we need to put only a few drops of iodine on the boiled leaf to test for starch.
We need to observe it carefully blue black color shows the presence of starch.

Answer 2

Answer

Step 1: A fresh leaf is taken.

Step 2: The leaf is boiled in water for few minutes to soften the cells in the leaf.

Step 3: Now, dip this leaf in iodine solution.

Step 4: The color of the leaf will changes into blue black color when iodine is added to it which shows the presence of starch in it.

Safety precautions ;

Wear safety goggles.

Keep ethanol away from Bunsen burner; ethanol is flammable.

Tie the hair back.

Tuck ties, files and loose material away.

Keep all bags out of the way to avoid tripping up.

Make sure you are not wearing tight clothes.

Use the forceps to place the leaf in the boiling water.