Question

write an experiment to show that sunlight is necessary for photosynthesis​

Answer 1

Answer:

EXPERIMENT TO SHOW THAT SUNLIGHT IS NECESSARY FOR PHOTOSYNTHESIS - DEFINITION

To prove the necessity of sunlight in photosynthesis following steps need to do

Take a plant with destarched leaf.

Leaf is partially covered with black paper on which a design is cut.

Expose this plant to sunlight for few hours and perform a starch test with iodine solution.

Observation-

Covered leaf part shows brown colouration.

Exposed leaf shows blue-black colour.

Result- Starch is present in the exposed leaf.

Conclusion- Leaf exposed to sunlight give iodine test, proving that sunlight is necessary for photosynthesis.

Answer 2

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• Pluck the leaf to be experimented.
• Cover a portion of leaf on both sides by using strips of black paper.
• Keep the plant in dark place for three days to destarch its leaves.
• Test the experimental leaf the the presence of starch.
• Expose the plant to sunlight for four hours.