Question

how would you test the presence of starch in leaves in points for class 7
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Answer 1

Answer:

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.

Answer 2

We identify the presence of starch by idoine. Idoine turns starch solution into blue colour.