Question

EXPERIMENT 1 (NUTRITION IN PLANTS)

AIM - to test for the presence of starch in a leaf after photosynthesis
MATERIALS REQUIRED - iodine, a dropper, Bunsen burner, test tube beaker, alcohol, white tray, potted plant..

PROCEDURE:
STEP 1: keep a healthy potted plant in darkness for about 24 to 48 hours.


STEP 2: pluck out a leaf of this plant before you keep it out in sunlight. This is leaf A, which is your control.


STEP 3: now pluck another leaf from the plant after it has been in sunlight for at least one to two hours. This is leaf B, which is your experimental leaf.


STEP 4: place both the leaves in a beaker containing hot water for a few minutes. Then take them out of the beaker. Pour alcohol in a test tube and immerse the two leaves in it. Keep the test tube inside a 1 litre beaker containing water and heat it.


STEP 5: when the alcohol starts to boil, green colour comes out of the leaves and the chlorophyll starts to dissolve in the alcohol.


STEP 6: take out the leaves and wash them in water to remove the alcohol.


STEP 7: place the leaves on the white tray and add a drop of iodine on the leaves by the help of a dropper.

OBSERVATION: you will observe that leaf A does not change its colour, whereas the colour of leaf B changes to blue-black, thereby indicating the presence of starch in it





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Answer 1

Answer:

Ok sure . .......

Explanation:

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Answer 2

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