Question

How would you test the presence of starch in leaves?

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Answer 1

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Take two potted plants of the same kind. Keep one in the dark for 72 hours and the other in sunlight. Perform the iodine test with the leaves of both the plants as given below. Now leave the pot which was earlier kept in the dark, undisturbed for 3 – 4 days and perform the iodine test again on its leaves.

Iodine test:

Put iodine solution on the leaf

Observation:

• Blue-black colour will be observed on the leaves of the plant kept in sunlight, which indicates the presence of starch.

• Blue-black colour will not be observed on the leaves of plant kept in the darkroom. This indicates the absence of starch.

Answer 2

Answer:

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Explanation:

Steps to test the presence of starch in leaves :

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.