Question

write an experiment to show chlorophyll is necessary for photosynthesis

Answer 1

Procedure

1. Take a plant with variegated which has chlorophyll only in patches. Such leaves can be found in plants like Colecus.
2. Destarch tits leaves by placing the plant in dark for 2-3 days.
3. Place the plant again in sunlight for 4-6 hours. Test the leaf for presence of starch.

Observation:

Only the parts that were green previously, turn blue-black with iodine.

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Answer 2

${ \underline{ \bigstar\boxed {\bold {Aim : }}}}$

To show that chlorophyll is necessary for photosynthesis

${ \underline{ \bigstar\boxed {\bold {Materials \: Required : }}}}$

a coleus leaf, beaker, water, alcohol, iodine solution, test tube, tweezers, tripod stand, Bunsen burner, white tile

${ \underline{ \bigstar\boxed {\bold {Method:}}}}$

1. Pluck a leaf from a healthy plant and place it in a beaker of water. Boil the water for three minutes.
2. Take the leaf out carefully with tweezers and place it in a test tube of alcohol.
3. Place the test tube in the beaker of boiling water for 10 minutes.
4. Take the leaf out and wash it carefully in water and place it on a white tile.
5. Place a few drops of iodine solution on the leaf.

${ \underline{ \bigstar\boxed {\bold {Observations \: and \: conclusions:}}}}$

You will see that the alcohol removes the green colour from the leaf. The addition of iodine solution makes the parts of the leaf that were originally green turn blue-black. This shows that only the green parts of the leaf contain chlorophyll, and hence make starch.