Why do seeds kept in water swell up?

OP inside the seed is low.

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OP of water is high.

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Water potential gradient develops between the seed coat and water.

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Diffusion pressure deficit of seed is very high.

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Solution

The correct options are
C
Water potential gradient develops between the seed coat and water.

D
Diffusion pressure deficit of seed is very high.

Seeds have a very high matrix potential, which lowers their water potential and raises their diffusion pressure deficit considerably. Hence a lot of water enters the seeds and they swell up.

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