mark the odd one ( w.r.t internal factors affecting photosythesis )

Options

A. Amount of chlorophyll
B. Light intensity
C. Mesophyll cells
D. Orientation of leaves

Answer

To solve the question of identifying the odd one out with respect to internal factors affecting photosynthesis, we will analyze each option provided:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is the process by which plants convert light energy into chemical energy, using carbon dioxide and water, facilitated by chlorophyll and sunlight.

2. **Identifying Internal Factors**:
- Internal factors affecting photosynthesis include:
- **Amount of Chlorophyll**: Essential for absorbing light.
- **Light Intensity**: Necessary for driving the photosynthetic reactions.
- **Mesophyll Cells**: These cells facilitate the entry of carbon dioxide into the leaf, which is crucial for photosynthesis.

3. **Analyzing the Options**:
- **Option 1: Amount of Chlorophyll**: This is a direct internal factor affecting the rate of photosynthesis.
- **Option 2: Light Intensity**: This is also a critical internal factor that influences photosynthesis.
- **Option 3: Mesophyll Cells**: These cells are vital for the process as they allow gas exchange.
- **Option 4: Orientation of Leaves**: This refers to how leaves are positioned on the plant. While it can affect light capture, it is not an internal factor directly influencing the photosynthetic process itself.

4. **Identifying the Odd One**:
- Among the options, the **orientation of leaves** does not directly affect the internal mechanisms of photosynthesis like the other three options do. Therefore, it is the odd one out.

### Conclusion:
The odd one out with respect to internal factors affecting photosynthesis is **Orientation of Leaves**.

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