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Experiments conducted to prove the formation of starch in plants

A leaf is boi...

Question

A leaf is boiled in alcohol before using iodine for a starch test in order to

A

Dissolve starch

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B

Dissolve chlorophyll

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C

Soften the leaf

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D

Make it react with iodine

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Solution

The correct option is B Dissolve chlorophyll
We boil the leaf in alcohol when we are testing it for starch to remove the green pigment chlorophyll present in it.
For the starch test, we need to observe the colour change from brown to blue when iodine is put on the leaf. Hence, A leaf is boiled in alcohol before using iodine for a starch test to decolourize it.
So, the correct answer is 'dissolve chlorophyll'.

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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. 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
(2) disinfects the leaf
(3) allows iodine to enter the leaf
(4) dissolves chlorophyll from leaf

Q. The following are the steps followed to perfom the Iodine test for the detection of starch production in plants.
i) Iodine solution is added
ii) Leaf that was partly covered is boiled in alcohol
iii) Potted plant with a leaf partly covered with aluminium foil is exposed to sunlight
iv) the leaf is rinsed in water

The correct sequence of steps to perform the test is

Q. (a) why is the leaf boiled in alcohol for a short time?
(b) why do we dip the leaf in water before adding the iodine solution?

Q. A green leaf is partially covered and placed in the light for several days. If it is then boiled and tested for starch with iodine, what will be the result?

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Experiments conducted to prove the formation of starch in plants

Standard VIII Biology

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