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When any dry plant material is kept...

When any dry plant material is kept in water , they swell up . Name and define the phenomenon involved in this change .

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The swelling up is due to Imbibition. Imbibition is a type of diffusion in which a solid absorbs water and gets swelled up. If Imbibition were not there, seedlings would not have been able to emerge out of the soil.
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