In plants, most diffusible sugar from source to sink is

Options

A. Glucose
B. Sucrose
C. Starch
D. Fructose

Answer

To solve the question "In plants, most diffusible sugar from source to sink is," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Source and Sink**:
- In plants, the source refers to the part where photosynthesis occurs, primarily the leaves. The sink is the part where the sugars are utilized or stored, such as the roots or fruits.

2. **Photosynthesis Process**:
- During photosynthesis, plants convert carbon dioxide and water into glucose using sunlight. This process primarily occurs in the chloroplasts of leaf cells.

3. **Sugar Conversion**:
- The glucose produced in the leaves is not transported directly to the sink. Instead, it is often converted into sucrose. This conversion is important because sucrose is more stable and less reactive than glucose.

4. **Transport Mechanism**:
- Sucrose is transported from the source (leaves) to the sink (roots or fruits) through the phloem, which is the vascular tissue responsible for the transport of nutrients.

5. **Diffusibility of Sugars**:
- Among the sugars mentioned (glucose, sucrose, starch, and fructose), sucrose is the most diffusible sugar. It can easily move through the plant's phloem to reach the sink.

6. **Conclusion**:
- Therefore, the most diffusible sugar from source to sink in plants is **sucrose**.

### Final Answer:
The most diffusible sugar from source to sink in plants is **sucrose**.

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