A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it, after which it was placed in sunlight for a few hours. One of the leaves was then plucked and an outline of the leaf making the green and non-green regions were drawn. The leaf was then tested for starch. Using the above information, answer the following question

State the aim of the above experiment.

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Solution

The experiment is conducted to prove that chlorophyll is necessary for photosynthesis.

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A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it, after which it was placed in sunlight for a few hours. One of the leaves was then plucked and an outline of the leaf making the green and non-green regions were drawn. The leaf was then tested for starch. Using the above information, answer the following question

Give the chemical equation to represent the process of starch formation in plants.

Two healthy green plants were placed in the dark for 24 hours. They were then set up as shown in the figure and were left for 4 hours. Then a leaf was taken from each plant and the chlorophyll was removed from the leaves.

What hypothesis is being tested in this experiment?

A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept it in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with dark paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.

(a) What aspect of photosynthesis was being investigated ?

(b) Is there any control in this experiment ? If so, state it.

(d) Describe step by step, how the candidate proceeded to test leaf for the presence of starch.

Q. A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
During the starch test why was the leaf -
(1) boiled in water
(2) boiled in methylated spirit.

Q. Two healthy green plants were places in the dark for 24 hours. They were then set up, as shown in the figure, for 4 hours. Then a leaf was taken form each plant and the chlorophyll was removed from the leaves:
(i) What is the next and final step in this experiment?
(ii) What would be the results of the final step?
(iii) Why was it necessary to grease the glass sheet?
(iv) What hypothesis is being tested in this experiment?
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