Translocation of carbohydrate nutrients usually occurs in the form of

Options

A. glucose
B. maltose
C. starch
D. sucrose

Explanation

**Step-by-Step Solution:**

1. **Understanding Translocation**: Translocation refers to the movement of nutrients, particularly carbohydrates, from one part of the plant to another. This process is essential for distributing energy and resources throughout the plant.

2. **Identifying the Transport System**: In plants, carbohydrates are primarily transported through the phloem, which is one of the two types of vascular tissue (the other being xylem). The phloem is responsible for transporting organic nutrients, especially sugars.

3. **Carbohydrate Forms**: After the photosynthesis process, carbohydrates can exist in various forms:
- **Glucose**: A simple monosaccharide.
- **Maltose**: A disaccharide made of two glucose units.
- **Starch**: A polysaccharide that serves as a storage form of glucose.
- **Sucrose**: A disaccharide composed of glucose and fructose.

4. **Evaluating the Options**:
- **Glucose**: While it is a product of photosynthesis, it is not the primary form for long-distance transport.
- **Maltose**: Similar to glucose, it is not suitable for long-distance transport.
- **Starch**: This is primarily a storage form and not directly translocated.
- **Sucrose**: This is the most common form of carbohydrate that is translocated in plants because it is soluble and can move easily through the phloem.

5. **Conclusion**: Based on the above evaluation, the best form of carbohydrate nutrients for translocation in plants is **sucrose**.

**Final Answer**: The translocation of carbohydrate nutrients usually occurs in the form of **sucrose** (Option D).

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