When any dry plant material or seeds are kept in water, they swell up.
Q(b)Define this phenomenon.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Phenomenon**: When dry plant materials or seeds are placed in water, they absorb water and increase in size.

2. **Defining the Process**: This process of water absorption by dry plant materials or seeds is called "imbibition."

3. **Nature of Imbibition**: Imbibition is a special type of diffusion. In this context, diffusion refers to the movement of water molecules from an area of higher concentration (the water) to an area of lower concentration (the dry seeds or plant materials).

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