Approximate time required by a diffusing particle across a plant cell about 50 `mum` is

Options

A. 2.5 minute
B. 2.5 seconds
C. 25 seconds
D. 0.25 seconds

Answer

To solve the question regarding the approximate time required by a diffusing particle to cross a plant cell of about 50 micrometers, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Diffusion**:
- Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. It is a passive process, meaning it does not require energy.

2. **Consider the Distance**:
- The question specifies that the distance to be crossed by the diffusing particle is 50 micrometers (µm).

3. **Evaluate the Speed of Diffusion**:
- Diffusion is generally a slow process, especially over longer distances. However, for short distances like 50 µm, diffusion can occur relatively quickly.

4. **Estimate the Time Required**:
- Based on biological studies and empirical data, it is estimated that a particle can diffuse across a distance of 50 µm in approximately 2.5 seconds.

5. **Select the Correct Option**:
- The options given are:
- A) 2.5 minutes
- B) 2.5 seconds
- C) 25 seconds
- D) 0.25 seconds
- Since we estimated the time to be around 2.5 seconds, the correct answer is option B) 2.5 seconds.

### Final Answer:
The approximate time required by a diffusing particle to cross a plant cell about 50 micrometers is **2.5 seconds**.