Bulk of water requirement of plant is met through the process of

Options

A. (a) active absorption
B. (b) passive absorption
C. (c) root pressure
D. (d) imbibition

Answer

**Step-by-Step Solution:**

1. **Understanding Water Absorption in Plants:**
- Plants require water for various physiological processes, and they absorb water primarily through their roots.

2. **Types of Water Absorption:**
- There are two main types of water absorption in plants: active absorption and passive absorption.
- **Active Absorption:** This process involves the use of energy (ATP) generated from root respiration. It occurs against the concentration gradient, meaning that roots actively take up water from the soil even when the concentration of water is lower in the roots than in the surrounding soil.
- **Passive Absorption:** This process does not require energy. Instead, it relies on the transpiration pull created by the loss of water vapor from the leaves. As water evaporates from the leaf surface, it creates a negative pressure that pulls more water up from the roots through the xylem.

3. **Comparison of Active and Passive Absorption:**
- **Energy Requirement:** Active absorption requires ATP, while passive absorption does not.
- **Rate of Absorption:** The rate of water absorption is generally higher in passive absorption due to the continuous transpiration process, whereas active absorption has a slower rate.

4. **Conclusion:**
- Given that the question asks for the process through which the bulk of water requirement of plants is met, the answer is passive absorption. This is because it is more efficient and does not require energy expenditure from the plant.

5. **Final Answer:**
- The bulk of water requirement of plants is met through the process of **passive absorption**.

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