Question

prove that sunlight is necessary for photosynthesis​

Answer 1

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Answer 2

Aim :

• To prove that sunlight is necessary for photosynthesis.

Apparatus :

1. Potted plant
2. Light green
3. Iodine solution
4. Petridish
5. Black paper

Procedure :

• Take a potted plant and destarch it by keeping it in dark of 3-4 days.
• Cover one of its leaf with on which a design out of on both side of leaf.
• Fix the paper on the leaf in such a manner that light doesnot enter the dark part.
• Place this plant in sunlight for few hours.
• After few hours of exposure to bring bright sunlight, test leaf which is covered by dark black paper for the presence of starch.

Observation :

• It will be observed that only the part of the leaf, which could get sunlight through the cut out design, turns bluish black colour showing the presence of starch.

Result :

• The experiment proves that light is necessary for photosynthesis.

Precautions :

• Place the black paper properly.

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