Question

Design an experiment to demonstrate that
chlorophyll is essential for photosynthesis.​

Answer 1

Answer:

In this experimental leaf, the part of the variegated leaf which contain green patches will give a positive test for starch i.e. iodine when added to this part of the leaf will turn into blue-black color. ... Thus this experiment proves chlorophyll is necessary for leaves to prepare starch through photosynthesis

Explanation:

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Answer 2

Aim: To show that chlorophyll is necessary for photosynthesis.

Materials required: A plant with variegated leaves, alcohol, iodine solution, water bath, beaker, petri dish and dropper.

Procedure: 1. Take a plant with variegated leaves which has chlorophyll only in patches.

2. Destarch it by keeping it in a dark room for 3 days.

3. Take the plant and keep it in daylight for 4-6 hours.

4. Then, pluck a leaf from the plant and conduct starch test on it.

Observation: Only parts of the leaf which is green in color turns blue-black after starch test.

Conclusion: This shows that chlorophyll is necessary for photosynthesis.