Absorption of water is increased when

Options

A. Transpiration is increased
B. Photosynthesis is increased
C. Respiration is increased
D. Root pressure is increased

Answer

**Step-by-Step Solution:**

1. **Understanding Water Absorption in Plants**: Water absorption in plants primarily occurs through the roots. The efficiency of this process can be influenced by various factors, including transpiration.

2. **Transpiration Pull Theory**: According to the transpiration pull theory, water loss from the aerial parts of the plant (leaves and stems) creates a negative pressure (or pull) that helps draw water up from the roots through the xylem.

3. **Role of Transpiration**: When water evaporates from the leaves during transpiration, it creates a vacuum that pulls more water from the soil into the roots. This means that the more water a plant loses through transpiration, the more water it can absorb from the soil.

4. **Cohesion and Adhesion**: Water molecules exhibit cohesive forces (attraction between water molecules) and adhesive forces (attraction between water molecules and the walls of the xylem vessels). These forces help maintain a continuous column of water in the xylem, facilitating upward movement.

5. **Relationship Between Transpiration and Water Absorption**: The amount of water lost through transpiration (let's denote it as A) is equal to the amount of water absorbed from the soil (denote this as B). Therefore, if transpiration increases (A increases), water absorption from the soil (B) also increases.

6. **Conclusion**: To increase water absorption in plants, one effective method is to enhance transpiration. Thus, the absorption of water is increased when transpiration is increased.

**Final Answer**: Absorption of water is increased when transpiration is increased.

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