How do you destarch a plant?

Place the plant in methylated spirit and heat it over a water bath

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Place the plant in a dark room for 24-48 hours

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Place the plant in boiling water

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Take the plant through the starch test

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Solution

The correct option is B
Place the plant in a dark room for 24-48 hours

We can de-starch a plant by keeping it in a dark room for 24-48 hours, this will ensure that the starch present in the plant would either be utilised by the plant or would be sent to organs of storage such as the roots, fruits, leaves etc.

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Similar questions

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.

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.

The steps in a starch test have been listed below.

1) Place the leaf in methylated spirit and heat it over a water bath

2) Pour iodine over it

3) Place the leaf in water

4) Place the leaf in boiling water

Which of the following correctly lists the order in which the steps are to be carried out.

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

A plant has leaves that are partly green and partly white. The plant is destarched and a leaf is partly covered by black paper.

The plant is placed in bright light for several hours. Four discs are then cut from the leaf in the positions shown and are tested for starch.

Which discs contain starch?

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