Identify the factor that will inhibit the absorption of water by roots

Options

A. Optimum soil temperature
B. Availability of water
C. Presence of air pockets in soil
D. Increased salinity

Answer

To solve the question of which factor inhibits the absorption of water by roots, we can analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Water Absorption by Roots**:
- Roots absorb water primarily through osmosis, which is influenced by various environmental factors.

2. **Evaluating Option 1: Optimum Soil Temperature**:
- Optimum soil temperature is essential for root function. The ideal temperature for water absorption is around 24 to 25 degrees Celsius.
- **Conclusion**: This option does not inhibit water absorption; therefore, it is incorrect.

3. **Evaluating Option 2: Availability of Water**:
- The availability of water in the soil is crucial for absorption. If water is present, roots will absorb it.
- **Conclusion**: This option cannot inhibit water absorption; hence, it is also incorrect.

4. **Evaluating Option 3: Presence of Air Pockets in the Soil**:
- Air pockets in the soil facilitate better aeration and drainage, which can enhance root function and water absorption.
- **Conclusion**: This factor does not inhibit absorption; it is incorrect.

5. **Evaluating Option 4: Increased Salinity**:
- Increased salinity refers to a higher concentration of salts in the soil. This can create a hypertonic environment, where the concentration of solutes outside the root cells is higher than inside.
- As a result, water moves out of the roots to balance the concentration gradient, leading to reduced water absorption.
- **Conclusion**: Increased salinity is the factor that inhibits water absorption by roots, making this the correct answer.

### Final Answer:
The factor that will inhibit the absorption of water by roots is **Increased Salinity**.

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