Question

Prove that " sunlight is necessary to form starch in green plants" by black paper experiment ​

Answer 1

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${\bold{\underline{\underline{Aim \: :}}}}$

To prove that sunlight is necessary for photosynthesis experiment.

${\bold{\underline{\underline{Apparatus\: :}}}}$

• Potted plant
• Light screen
• Iodine solution
• Petridish
• Black paper

${\bold{\underline{\underline{Procedure \: :}}}}$

1. Take a potted plant and destarch it by keeping in the dark for 3 to 4 days
2. Cover one of its leaves with black paper on which a design is cut on both sides of leaf.
3. Fix the paper on the leaf in such a manner that light does not enter the dark part
4. Place this plant in the sunlight few hours
5. After few hours of exposure to bright sunlight, test the leaf which is covered by black paper for the presence of starch.

${\bold{\underline{\underline{Observation \: :}}}}$

It will be observed that only the parts of the leaf, which could get sunlight through the cutout design, turns blue - black showing the presence of starch.

${\bold{\underline{\underline{Result\: :}}}}$

This experiment proves that light is necessary for photosynthesis.

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