Describe the experiment to show that ‘sunlight’ is essential for photosynthesis.
Answers
Answer:
The sunlight provides energy required to carry out chemical reactions involved in preparation of food.
Explanation:
The experiment to show that 'sunlight'is essential for photosynthesis.
1. we take a potted plant having green leaves and place it in a complete dark place for about three days to destarch its leaves.
2. Take a thin strip of aluminum foil and wrap it in the centre of one leaf in both sides ( while the leaf is still attached to the plant). The aluminum foil should be fixed tightly to the leaf by using paper clips so that sunlight may not enter it from the sides. The aluminum foil should cover only a small part of the leaf so that the remaining part of the leaf remains uncovered to exposed to sunlight ⛅.
3. Keep this potted plant in bright sunshine for three to four days.
4. Pluck the partially covered leaf from the the plant and remove its aluminum foil. Immerse this leaf in boilin water for few minutes. This will break down the cell membranes of the leaf cells and make the leaf more permeable to iodine solution. This leaf is now to be tested for the presence of starch. But before testing for starch, chlorophyll has to be removed from leaf.
5. After the test of presence of starch, you found that leaf which was covered and hidden from sunlight does not contain starch but the part of leaf which was exposed to sunlight contains starch, therefore we conclude that sunlight is necessary for photosynthesis.