Question

how can you prove with an experiment that sunlight is necessary for photosynthesis

Answer 1

Experiment to prove that sunlight is necessary for photosynthesis :

Take a potted plant.

Cover one of its leaf from the middle by a black strip or an aluminium foil so that the sunlight can't enter it.

Then put this potted plant in a dark room for 2-4 days.

Then put this potted plant in sunlight for 4-6 hours.

Then pluck the leaf and now the leaf is destarched.

Wash the leaf with hot water.

After it boil the water in alcohol ( not directly but with the help of water bath).

After it wash it with cold water.

Then pour some iodine solution on it.

Conclusion : You will clearly see that the whole leaf will be blue black in colour except the part which we Covered with foil.