Purple cabbage leaves do not loose their colour in cold water but do so in boiling water because

Plasma membrane get inactivated in boiling water

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Hot water can enter the cells readily

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The pigment is not soluble in cold water

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The cell wall is killed in boiling water

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Solution

The correct option is A Plasma membrane get inactivated in boiling water
The intensity of the colour increases with the increase in temperature because at higher temperature the semi-permeability of the plasma membrane is gradually lost and hence the pigments can escape the cell.
Hence the correct option is A.

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