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Test for Chlorophyll

A plant has l...

Question

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?

A

1 only

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B

1 and 2

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C

2 only

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D

3 and 4

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Solution

The correct option is C
2 only

Disc 2 contains starch. A variegated leaf is a leaf which has both green and non-green parts. As the green parts contain chlorophyll they can photosynthesis and contain starch, but the non-green parts do not contain chlorophyll, so they cannot photosynthesis.

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(2) that covered with green paper strip
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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

Why is the leaf boiled in water and alcohol before testing for the presence of starch?

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