Question

what are the precautions to be taken while experimenting the presence of starch in leaves?​

Answer 1

1..Importance of Photosynthesis

Provide food

Provide oxygen for respiration

2.. Iodine solution turns blue-black in presence of starch. Always perform this experiment under the supervision of a teacher. we can test a leaf for starch by:-

First, boil it in alcohol to remove the chlorophyll pigment so that we could easily see the color change. But this boiling process had to be carried out carefully. Keep a beaker with water on the burner.

Take some alcohol in a test tube with that leaf in it. Dip its end in water present in the beaker. heat it.

after boiling the leaf, wash it in water to remove alcohol.

Then pour dilute iodine solution over the leaf. You can see it has turned blue-black which indicates the presence of starch.

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Answer 2

Safety precautions

1. Wear safety goggles.
2. Keep ethanol away from Bunsen burner; ethanol is flammable.
3. Tie the hair back.
4. Tuck ties, files and loose material away.
5. Keep all bags out of the way to avoid tripping up.
6. Make sure you are not wearing tight clothes.
7. Use the forceps to place the leaf in the boiling water.

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