Most widely accepted theory of carbohydrate translocation is

Options

A. Mass flow theory
B. Root pressure theory
C. Imbibition theory
D. Transpiration theory

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks for the most widely accepted theory of carbohydrate translocation in plants. Carbohydrate translocation refers to the movement of sugars (primarily sucrose) produced during photosynthesis from the leaves to other parts of the plant.

2. **Reviewing the Options**: The options provided are:
- Mass flow theory
- Root pressure theory
- Imbibition theory
- Transpiration theory

3. **Analyzing Each Theory**:
- **Transpiration Theory**: This theory explains the movement of water in plants due to evaporation from the leaves. It does not specifically address carbohydrate translocation.
- **Imbibition Theory**: This theory deals with the absorption of water by plant tissues and does not pertain to the movement of carbohydrates.
- **Root Pressure Theory**: This theory explains how water is pushed upward through the plant due to pressure generated in the roots. While it relates to water movement, it does not explain carbohydrate movement.
- **Mass Flow Theory**: This theory, also known as the pressure flow hypothesis, explains how carbohydrates (mainly in the form of sucrose) are transported from the source (leaves) to the sink (growing tissues) through the phloem. It is based on the concept of pressure differences created by the loading and unloading of sugars.

4. **Conclusion**: Based on the analysis, the most widely accepted theory of carbohydrate translocation is the **Mass Flow Theory**.

**Final Answer**: Mass Flow Theory

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