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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(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?
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(d) Which process does not take place in the green leaves of the plant when it is kept in the dark room?

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.
Write a balanced chemical equation to represent the process of photosynthesis.

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.

(a) What aspect of photosynthesis was being tested ?

(b) Why was the plant placed in the dark before beginning the experiment ?

(1) boiled in water (2) boiled in methylated spirit.

(d) Write a balanced chemical equation to represent the process of photosynthesis.

(e) Draw a neat diagram of a chloroplast and label its parts.

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