Roots pressre can be responsible for pushing up water to____ in the stem.

Options

A. More height
B. Small heights
C. Both more height and small heights
D. None of these

Answer

**Step-by-Step Text Solution:**

1. **Understanding Root Pressure**: Root pressure is generated when ions are actively transported from the soil into the vascular tissue of the roots. This process creates a concentration gradient.

2. **Water Movement**: Due to the concentration gradient created by the active transport of ions, water moves into the roots from the soil. Water always moves from areas of lower solute concentration to areas of higher solute concentration.

3. **Pressure Generation**: As water enters the roots, it increases the pressure inside the xylem vessels. This pressure is what we refer to as root pressure.

4. **Height of Water Movement**: Root pressure can push water upward through the xylem, but it is primarily effective for moving water to small heights in the stem.

5. **Limitations of Root Pressure**: While root pressure can push water upwards, it is not sufficient for pushing water to greater heights. For taller plants, the main mechanism for water transport is transpiration pull, which is driven by the evaporation of water from the leaves.

6. **Conclusion**: Therefore, the correct answer to the question is that root pressure can be responsible for pushing up water to **small height** in the stem.

**Final Answer**: Small height.

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