Water potential in leaf tissue is 'positive' (near zore ) during

Options

A. Low transpiration
B. Excessive absorption
C. Excessive transpirants
D. Guttation.

Answer

**Step-by-Step Solution:**

1. **Understanding Water Potential**: Water potential is a measure of the potential energy in water, influencing the movement of water in plants. It is influenced by solute concentration and pressure.

2. **Water Potential Values**: Pure water has a water potential of zero. When solutes are added, the water potential becomes negative due to the presence of solutes, which reduces the free energy of water.

3. **Transpiration and Water Potential**: Transpiration is the process of water loss from the plant, primarily through stomata in leaves. High rates of transpiration can lead to a decrease in water potential, making it more negative.

4. **Conditions for Positive Water Potential**: A positive water potential (or near zero) in leaf tissue occurs when transpiration rates are low. This means that the loss of water from the leaf is minimal, allowing for a higher concentration of water relative to solutes.

5. **Conclusion**: Therefore, the water potential in leaf tissue is positive (near zero) during conditions of low transpiration, as the water content remains high relative to solute concentration.

**Final Answer**: Water potential in leaf tissue is 'positive' (near zero) during low transpiration.

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