Rate of water absorption is slow near freezing point because

Options

A. Water absorption is a metabolic process
B. Cell growth stops
C. Transpiration is reduced
D. Cell membrances become more viscous.

Answer

**Step-by-Step Solution:**

1. **Understanding Water Absorption**: Water absorption in plants primarily occurs through the roots. This process is essential for the plant's metabolism and growth.

2. **Impact of Temperature on Metabolism**: As the temperature decreases, particularly near the freezing point, metabolic processes in plants slow down. This includes the processes involved in water absorption.

3. **Effect on Root Growth**: At lower temperatures, root growth is inhibited. This means that the roots are less effective at taking up water from the soil.

4. **Cell Membrane Viscosity**: Near freezing temperatures, the cell membranes of root cells become more viscous. Viscosity refers to the thickness or stickiness of a fluid, which in this case affects the cell membrane's ability to allow water to pass through.

5. **Decreased Permeability**: As the cell membrane becomes more viscous, its permeability decreases. This means that water cannot easily move into the cells, leading to a reduced rate of water absorption.

6. **Conclusion**: Therefore, the rate of water absorption is slow near the freezing point primarily because the cell membrane becomes more viscous, which decreases its permeability and hinders water uptake.

**Final Answer**: The rate of water absorption is slow near freezing point because the cell membrane becomes more viscous.

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