What is the term used for uptake of water by the hemicellulose and pectin molecules of seed wall?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Components**: The question refers to hemicellulose and pectin molecules found in the seed wall. These are polysaccharides that play a crucial role in the structure of plant cell walls.

2. **Defining the Process**: The process of water uptake by these molecules is a specific type of absorption. It does not involve the dissolution of the water into the molecules but rather the absorption of water.

3. **Identifying the Term**: The term used for this specific uptake of water by hemicellulose and pectin is "imbibation." This term describes the process where solid colloids absorb liquid, leading to an increase in volume.

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