Question

What arethe major precautions you need to take in this presence of starch in the leaf experiment?
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Answer 1

Answer:

Steps to test the presence of starch in leaves :

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.

Explanation:

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Answer 2

Answer:

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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Explanation:

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