Question

how will you test for the presence of starch in a leaf​

Answer 1

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.

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Answer 2

Answer: Iodine solution is used to test leaves for the presence of starch. You need to:

1)Heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions)                                                                                                                                                                          2)Heat it in boiling ethanol for a few minutes (this removes most of its color)                                                                                                                              3)Wash with water and spread onto a white tile                                                       4)Add iodine solution from a dropping pipette

After a few minutes, the parts of the leaf that contain starch turn blue-black.