First step of influx of water into a plant (or) a root hair cell (or) a seed is

Options

A. Osmosis
B. Imbibition
C. Absorption
D. Suction

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the first step of water influx into a plant, root hair cell, or seed. This involves identifying the initial process through which water enters these biological structures.

2. **Identifying the Processes**: The options provided are osmosis, imbibition, absorption, and suction. Each of these processes has a different role in water movement:
- **Osmosis**: Movement of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.
- **Imbibition**: The physical process of absorption of water by solids, particularly dry materials.
- **Absorption**: General term for the process of taking in substances, including water.
- **Suction**: The process of drawing water into the plant through negative pressure.

3. **Analyzing Imbibition**: Imbibition is specifically the process where dry solids (like seeds or dry wood) absorb water and swell. This is a rapid process that occurs at the beginning of seed germination and is crucial for initiating growth.

4. **Conclusion**: The first step of water influx into a plant, root hair cell, or seed is **imbibition**. This process is essential for the initial hydration of seeds and other dry plant parts, allowing them to begin the growth process.

### Final Answer:
The first step of influx of water into a plant, root hair cell, or seed is **imbibition**.

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