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Test for Carbohydrates

In an experim...

Question

In an experiment related to photosynthesis a student added iodine to the leaf in order to test the presence of

A

Sucrose

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B

Glucose

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C

Starch

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D

Fructose

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Solution

The correct option is B Starch
In an experiment related to photosynthesis, a student added iodine to the leaf in order to test the presence of starch.
By adding iodine to the leaf, the starch present in the leaf turns black in color indicating the presence of starch in the leaf.

So the correct option is 'Starch'.

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Q. In an experiment to test the presence of starch in a leaf, the plucked leaf is first boiled in water for a few minutes. This is an important step in the experiment because it :
(1) converts glucose made in the leaf into starch
(2) dissolves chlorophyll present in the green leaf
(3) extracts starch to destarch the leaf
(4) makes the leaf more permeable to iodine solution

Q. In an experiment to test the presence of starch in a leaf, the leaf is boiled in alcohol for a few minutes using a water bath. This is an essential step in the experiment because alcohol:
(1) softens the leaf
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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?
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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?
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Q. In the experiment to show that light is necessary for photosynthesis, the plucked leaf is boiled in ethanol and then washed with water. After this, it is tested for the presence of a carbohydrate by a chemical which is :
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