The teacher instructed a student to place a healthy potted shoe flower plant in a dark room for 24 hours prior to an experiment on photosynthesis. The purpose of placing it in a dark room is

To increase the intake of carbon dioxide

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To increase the activity of chloroplast in leaves

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To destarch the leaves

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To denature the enzymes in the leaves

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Solution

The correct option is C
To destarch the leaves

This experiment is carried out to test the factors that affect the process of photosynthesis. The plant was placed in the dark room to destarch the leaves. In the absence of light, plants cannot photosynthesize, hence starch is not produced. So whatever starch was stored in the leaves, gets used up and leaves become destarched. After destarching, this plant can be used to test if the light has an effect on photosynthesis.

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Similar questions

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. In order to destarch the leaves for an experiment to show that sunlight is necessary for photosynthesis, the:
(1) leaves are kept in alcohol and boiled in a water bath
(2) leaves are soaked in iodine for two hours
(3) plant with the leaves is kept in dark room for 48 hours.
(4) plant with the leaves is exposed to light of a lamp, a night before the experiment

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?

The teacher instructed a student to place a healthy potted shoe flower plant in a dark room for 24 hours prior to an experiment on photosynthesis. The purpose of placing it in a dark room is

A potted plant was kept in the dark room for 48 hours prior to an experiment on photosynthesis. The purpose of keeping the plant in dark room is:

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