Photosynthates are translocated from source to sink organs mainly in the form of

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthates**: Photosynthates refer to the products of photosynthesis, primarily sugars that are produced in the leaves of plants.

2. **Identifying the Source and Sink**: In plants, the source is typically the leaves where photosynthesis occurs, and the sink refers to other parts of the plant, such as roots, fruits, and growing tissues, where these sugars are utilized or stored.

3. **Types of Sugars**: The main types of sugars produced during photosynthesis include glucose, fructose, and sucrose. Starch is a polysaccharide that serves as a storage form of glucose.

4. **Conversion of Glucose to Sucrose**: Although glucose is produced during photosynthesis, it is often converted into sucrose for transport. Sucrose is more stable and less reactive than glucose, making it a better choice for long-distance transport.

5. **Role of Phloem**: The translocation of photosynthates occurs through the phloem, which is the vascular tissue responsible for transporting sugars and other metabolic products downward from the leaves.

6. **Bidirectional Transport**: The transport of sucrose in the phloem is bidirectional, meaning it can move both upwards and downwards, depending on the needs of the plant.

7. **Conclusion**: Based on the above points, the correct answer to the question is that photosynthates are translocated from source to sink organs mainly in the form of sucrose.

**Final Answer**: Sucrose

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