Question

Describe any experiment to show that sunlight is essential for photosynthesis.

Answer 1

Answer.

keep the plant in a dark room for 1 day.after a day pick a leaf  from the plant ,you will notice the presence of starch in the leaf

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Answer 2

Answer:

The experiment of covering a specific part of a leaf of a plant with a paper and leaving it the sunlight along with a leaf uncovered. Decolourizing the leaf and adding of iodine solution on both the leaves will reveal that photosynthesis could only occur on the uncovered leaf. Hence, we can conclude that sunlight is essential for photosynthesis.

Explanation:

AIM:

To prove that sunlight is essential for photosynthesis.

Procedure:

1. For 1-2 days, place a healthy green potted plant in a dark room. This is done to ensure that the plant consumes all of its stored food and that the leaves are starch-free.
2. A section of the leaf is covered on both sides black paper, preventing sunlight from reaching the leaf region beneath the black paper.
3. The plant is now exposed to direct sunshine, but only a portion of the leaf is visible.
4. After a few hours, the covering is removed from the specific leaf. The black sheets are removed, and the leaf is then decolorized in boiling water with alcohol. Decolorization happens when the chlorophyll in the leaf is eliminated, causing the leaf to lose its pigmentation.
5. Iodine solution is applied to the decolorized leaf.

Observation:

The part of the leaf that was covered by paper remained colourless after adding the iodine solution, whereas the region that was exposed to sunlight turned blue-black.

Inference:

Starch is the storage form of the food that plants prepare (carbohydrates) through the photosynthesis process. This starch turns blue-black when it reacts with the iodine solution. Only those parts of the leaf that were exposed to sunlight were able to photosynthesize, and when tested with iodine, they turned blue-black.