Requirement of special membrane proteins and highly selective nature are features related to

Options

A. Simple diffusion
B. Facilitated diffusion
C. Active transport
D. More than one option is correct

Answer

To solve the question regarding the requirement of special membrane proteins and their highly selective nature, we can analyze the different transport mechanisms in plants. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding Transport Mechanisms**:
- There are various transport mechanisms in plants, including simple diffusion, facilitated diffusion, and active transport.

2. **Analyzing Simple Diffusion**:
- Simple diffusion is a passive transport process that occurs along the concentration gradient (from high to low concentration).
- It does not require energy or special membrane proteins, making it non-selective.
- **Conclusion**: Simple diffusion is not the answer.

3. **Analyzing Facilitated Diffusion**:
- Facilitated diffusion is also a passive transport process that occurs along the concentration gradient.
- It requires special membrane proteins (like porins) to help transport substances across the membrane.
- This process is highly selective due to the specific proteins involved.
- **Conclusion**: Facilitated diffusion fits the criteria of requiring special membrane proteins and being highly selective.

4. **Analyzing Active Transport**:
- Active transport moves substances against their concentration gradient (from low to high concentration).
- This process requires energy (usually in the form of ATP) and involves specific proteins known as pumps.
- Active transport is also selective due to the specific proteins that facilitate the transport.
- **Conclusion**: Active transport also meets the criteria of requiring special membrane proteins and being highly selective.

5. **Final Conclusion**:
- Both facilitated diffusion and active transport require special membrane proteins and are highly selective in nature.
- Therefore, the correct answer to the question is that these features are related to both facilitated diffusion and active transport.

### Final Answer:
The requirement of special membrane proteins and their highly selective nature are features related to **facilitated diffusion and active transport**.

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