Question

How would you test the presence of strach in leaves ? ​

Answer 1

Answer:

The presence of starch in leaves can be tested by Iodine test.

Explanation:

• The presence of starch in leaves can be tested by Iodine test. When we remove chlorophyll from leaf by boiling it in alcohol and then put 2 drops of iodine solution, its colour change to blue indicates the presence of starch.

• It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test.

Answer 2

• Starch is a carbohydrate. During photosynthesis the glucose produced by plant is stored in the form of starch.
• Plants derive energy from starch.

• To check the presence of of the starch in leaves we have to Perform Iodine test.

1. We leave the leaf in hot boiling water for 30seconds because it stops all the Chemical reaction inside the leaf.
2. Now, Take the leaf and boil it in ethanol solution for a few minutes. Which makes the leaf colorless
3. After boiling the leaf in ethanol. Wash it water and place them on a white surface
4. Now, Add iodine on the leaf.
5. After few minutes We can overserve the color change in the leaf and it that leaf contains Starch the leaf turns it color into blue-black.