When exposed to sulphur dioxide gas, the green colour of the plant leaves will be changed into ___________.

Violet

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Indigo

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Red

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Yellow

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Solution

The correct option is D Yellow
D.
Chronic injury is caused by a long term absorption of sulphur dioxide at sub lethal concentration. In this case sulphate starts to accumulate into the cell which is more toxic than sulphite. Chronic injury shows as a yellowing or chlorosis of the leaf, sometimes from lower to upper surfaces on broad leaves.

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