The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is:

Options

A. Root pressure
B. Imbibition
C. Plasmolysis
D. Transpiration

Answer

To answer the question regarding the process responsible for facilitating the loss of water in liquid form from the tip of grass blades at night and in the early morning, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the process that leads to the loss of water in liquid form from the tips of grass blades during the night and early morning.

2. **Identifying the Options**: The given options are:
- A) Root pressure
- B) Imbibition
- C) Plasmolysis
- D) Transpiration

3. **Analyzing Each Option**:
- **Root Pressure**: This is the pressure exerted in the roots of plants that can push water upwards through the plant. It is particularly significant during the night when transpiration rates are low.
- **Imbibition**: This is the process of absorption of water by solid particles, which does not directly relate to the loss of water.
- **Plasmolysis**: This refers to the process where cells lose water in a hypertonic solution, leading to the contraction of the protoplast. It does not apply to the loss of water from grass blades.
- **Transpiration**: This is the process of water vapor loss from plant surfaces, primarily through stomata, and is more prominent during the day.

4. **Determining the Correct Process**: Since the question specifies the loss of water in liquid form during the night and early morning, the most relevant process is **root pressure**. This pressure causes water to be pushed out of the tips of grass blades, especially when transpiration is minimal.

5. **Conclusion**: Therefore, the correct answer is **A) Root pressure**.