For imbibition the parameter(s) which are required between the adsorbent and the liquid imbibed.

Answer

**Step-by-Step Solution:**

1. **Understanding Imbibition**: Imbibition is the process by which a substance (usually a solid) absorbs a liquid, leading to swelling. This is commonly observed in seeds when they absorb water.

2. **Identifying Required Parameters**: There are three key parameters that are necessary for imbibition to occur effectively between the adsorbent (the solid) and the liquid being imbibed.

3. **First Parameter - Water Potential Gradient**:
- A water potential gradient must exist between the adsorbent and the liquid. This means that there should be a difference in water potential, which drives the movement of water into the adsorbent. The liquid should have a higher water potential compared to the adsorbent for imbibition to occur.

4. **Second Parameter - Affinity Between Adsorbent and Liquid**:
- The adsorbent and the liquid must have an affinity for each other. This means that the molecules of the liquid should be attracted to the molecules of the adsorbent. For example, water has a strong affinity for polar substances like cellulose in plant tissues.

5. **Third Parameter - Increase in Temperature**:
- An increase in temperature enhances the imbibition rate. Higher temperatures increase the kinetic energy of the molecules, which facilitates the movement of water into the adsorbent more rapidly.

6. **Conclusion**: Therefore, the three parameters required for imbibition are:
- A water potential gradient
- Affinity between the adsorbent and the liquid
- An increase in temperature

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