An activity which demonstrates that chlorophyll is essential for photosynthesis..
Answers
Explanation:
Experiment to show that chlorophyll is necessary for photosynthesis.
1. Take a potted ptant with variegated leaves (money plant or croton's) .
2. keep is in a dark room for three days so that all the stars gates used up.
3. Now keep the plants in sunlight for about six hours.
4. Pluck a leaf from the plant. Mark the green area in it and trace them on a sheet of paper.
5. Deep the leaf in boiling water for a few minutes.
6. After this imerge it in a beaker containing alcohol.
7. carefully place the above beaker in a water- bath and heat till the alchohal begins to boil. The green part of the leaf get discoloured.
8. Wash the decolourished leaf with hot water to soften it and remove any chlorophyll which may be sticking to it.
9.pour iodine solution over the colorless leaf and observe the change in colour of the leaf.
10. we will find that the outer part of the leaf that was originally (without chlorophyll) does not turn blue black on adding iodine solution showing that no starch is present in this outer part of the leaf.
from these observations we conclude that photosynthesis to make a starch does not take place without chlorophyll.
11. the inner part of the leaf which was originally green (contain chlorophyll ) turns blue black on adding iodine solution showing that starch is present in this inner part of the leaf. from this observation we conclude that the photosynthesis to make a starch take place in the presence of chlorophyll. In other words chlorophyll is necessary for the process of photosynthesis to take place.
Answer:
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Chlorophyll is necessary for photosynthesis:
The experiment to show that chlorophyll is necessary for photosynthesis is as follows a chlorophyll producing leaf along with the plant is taken and a chlorophyll bleached leaf along with the plant is taken.
Both these plants are destarched before the experiment and kept in the atmosphere containing water, carbon dioxide, and sunlight. After 24 hours the starch content of the leaf may be checked with an iodine solution to prove that the chlorophyll deprived plant did not produce any starch.
