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Histology of Duodenum

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Question

Which substance is used to remove chlorophyll from a green leaf during photosynthesis experiments?

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Solution

Green leaves are boiled in alcohol to remove chlorophyll during photosynthesis experiments.

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Q. In the experiment to show that sunlight is necessary for photosynthesis:
(a) What is done to destarch the green leaves of the potted plant initially?
(b) What is done to a part of destarched leaf so that photosynthesis may not take place in that part of the leaf (before keeping the potted plant in sunlight)?
(c) How is chlorophyll removed from the green leaf before further testing?
(d) Which reagent is used to test the presence/absence of starch in the parts of experimental leaf?

Q. In the experiment to demonstrate that starch is made as food by the process of photosynthesis, the plucked leaf is first boiled in water for about 3 to 5 minutes in order to :

(1) remove chlorophyll from leaf cells

(2) break down the cell membranes of leaf cells

(3) soften the brittle leaf

(4) convert starch into glucose so that is can be tested easily

A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis in order to

(a) remove chlorophyll from the leaves.

(b) remove starch from the leaves.

(c) ensure that no photosynthesis occurred.

(d) ensure that the leaves are free from starch.

Q. In an experiment, a destarched, long and narrow green leaf (still attached to a potted plant) is introduced into a wide-mouthed glass bottle through an airtight cork. The glass bottle contains some potassium hydroxide solution in its lower part (but the leaf remains above this solution). The whole set-up is placed in sunlight for 2-3 days. The leaf is then taken out. After removing chlorophyll, the leaf is treated with iodine solution. No blue-black colour is produced in the leaf.
(a) Which substance could not be synthesised in the green leaf?
(b) What is the function of potassium hydroxide solution inside the glass bottle?
(c) Which condition necessary for photosynthesis is not fulfilled in this experiment?

Q. Which one of the following is the best reason for leaving a plant in a dark place before carrying out experiments on photosynthesis?
(a) To remove chlorophyll from the leaves.
(b) To increase the release of CO₂ by the leaves.
(c) To remove starch from the leaves.
(d) To stop synthesis process in the leaves.

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Histology of Duodenum

Standard XII Biology

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