Light is necessary for photosynthesis
Light is necessary for photosynthesis
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Experiment:
1.Take a potted plant having green leaves and place it in a completely dark place for about 48 hours to destarch its leaves.
During photosynthesis plants form starch in the leaves. Destarching a plant involves preventing photosynthesis, usually by keeping the plant in the dark for 24 to 48 hours until the starch is used by the plant for their food and energy.
2. Take a thin strip of black paper and wrap it on one leaf on both the sides so that sunlight may not reach it from both the sides.
3. Cover the leaf partially so that the remaining part of the leaf remains exposed to sunlight.
4. Keep this potted plant with partially covered leaf in bright sunlight for a few hours.
5. After few hours pluck the partially covered leaf from the plant and remove the black paper.
6. Put the leaf in boiling water for a few minutes.
7. Now boil the leaf in alcohol over a water bath. In this way, we get a decolourised leaf due to removal of chlorophyll.
8. Wash the decolourised leaf with water to remove any alcohol present.
9. Put the leaf on a white paper and pour iodine solution over the leaf and observe any change in colour.
10. The middle part of leaf which was covered with black paper does not turn blue-black on adding iodine solution showing that no starch is present in the middle part of the leaf.
This is because sunlight could not reach the covered part of the leaf due to which the leaf could not do photosynthesis to produce starch.
11. The uncovered part of leaf which was exposed to sunlight turns blue-black on adding iodine solution showing that starch is present in this part of leaf.
This means that the part of leaf which was exposed to sunlight could do photosynthesis to produce starch.
We conclude that sunlight is necessary for photosynthesis to produce food like starch.
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