Question

Write an activity to test the presence of starch in leaf.

Answer 1

Materials Required :
Leaf, Boiling tube, burner, water, iodine solution.

Procedure :
1. Take a leaf(early exposed to sunlight) and put it into a boiling tube contains water.
2. Heat the tube over the burner.
3. After hearing a while ,drop some drops of iodine solution on it.

Observation :
The solution or the water contain the leaf turns blue-black in color.

Result :
Leaf contains starch which makes the solution to change its colour.

Answer 2

$\textbf{Answer :}$


* Take a potted plant and put in a dark room.

* After sometime pluck a leave from the plant.

* Then boil it in water for 5 min to soft it and after doing that place the leave in a test tube containing alcohol.

* Place the test tube in a beaker containg water.

* Then, genlty heat the beaker till the alcohol dissolves in the chrolophyll and the leaves loses its green colour.

* Wash the leaf and Water.

* After doing that place the leaf on a plate and add a few drops of iodine solution.

* The parts that turn blue black show the presence of starch in a leaf.

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