Rate of water absorption can be increased through
(a) Decreased transpiration
(b) Decreased ion absorption
(c) Increased photosynthesis
(d) Increased transpiration

Options

A. Decreased transpiration
B. Decreased ion absorptiion
C. Increased photosyntesis
D. Increased transpiration

Answer

To determine how the rate of water absorption in plants can be increased, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Water Absorption in Plants**:
- Water absorption in plants primarily occurs through the roots. The rate of absorption can be influenced by various physiological processes.

2. **Analyzing Option A: Decreased Transpiration**:
- Transpiration is the process of water loss from the plant, primarily through stomata. If transpiration decreases, it means less water is being lost. However, this also means that the demand for water absorption decreases, as the plant doesn't need to replace as much lost water. Thus, decreased transpiration would not increase water absorption.
- **Conclusion**: This option is incorrect.

3. **Analyzing Option B: Decreased Ion Absorption**:
- Ion absorption occurs through the roots and is essential for various physiological functions in plants. However, decreased ion absorption does not directly correlate with the rate of water absorption. Water absorption is more related to the water potential gradient rather than ion uptake.
- **Conclusion**: This option is incorrect.

4. **Analyzing Option C: Increased Photosynthesis**:
- Photosynthesis is the process by which plants convert light energy into chemical energy. While it does require water, an increase in photosynthesis does not directly enhance the rate of water absorption. The relationship is more complex and does not imply a direct increase in absorption.
- **Conclusion**: This option is incorrect.

5. **Analyzing Option D: Increased Transpiration**:
- Increased transpiration leads to a higher rate of water loss from the plant. When water evaporates from the stomata, it creates a negative pressure in the leaf, which pulls water from the roots through the xylem. This process increases the water potential gradient, encouraging more water to be absorbed by the roots.
- **Conclusion**: This option is correct.

### Final Answer:
The rate of water absorption can be increased through **(d) Increased transpiration**.

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