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Photosynthesis Experiments

The process o...

Question

The process of keeping a plant in the dark for one or two days while testing for photosynthesis is known as

A

dormancy

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B

destarching

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C

starching

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D

phosphorylation

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Solution

The correct option is B destarching
For destarching a plant, it is kept in dark for one or two days so that the plant cannot perform photosynthesis. When there is no light the plant cannot make starch. Thus, stored starch is used up and the plant is destarched.

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Q. A student is performing an experiment to show that sunlight is necessary for photosynthesis. In the first stage, he keeps a potted plant with green leaves in a dark place for about 3 days. Towards the end of the experiment, he boils one leaf in alcohol before using iodine for testing starch.
(a) Why is the plant kept in a dark place for about 3 days?
(b) Why is the leaf boiled in alcohol before testing for starch with iodine?

Q. For the experiment ‘Light is necessary for photosynthesis’, the potted plant was first kept in darkness for a day. This is to:
(1) deactivate chloroplasts
(2) destarch leaves
(3) activate chloroplasts
(4) prepare leaves for photosynthesis

Q. A student first keeps a potted plant having green leaves in a dark room for more than 3 days. He then takes out this potted plant from the dark room and places it in bright sunshine for about 3 days.
(a) Which substance present in the green leaves is all used up when the potted plant is kept in a dark room?
(b) What is this process known as?
(c) Which plant process uses up all the above substance from green leaves when the potted plant is kept in the dark room?
(d) Which process does not take place in the green leaves of the plant when it is kept in the dark room?

Q. The process of keeping a plant in the dark for one or two days while testing for photosynthesis is known as

Q. The process of keeping a plant in the dark for a day or two is known as ___.

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