Why do seeds swell when placed in water?

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Solution

Imbibition:
Solids absorb water through a special type of diffusion that causes a significant volume increase in the solids. This special type of diffusion is known as imbibition.
Water potential gradient between the absorbent and the liquid imbibed is necessary for imbibition.
Due to imbibition, seeds swell when submerged in water.
The volume of the cell temporarily increases as a result of this swelling, which doesn't require energy because materials are moved passively.

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