What is the direction of movement of sugars is

Options

A. Non-multidirectional
B. Upward
C. Downward
D. Bi-directional

Answer

### Step-by-Step Text Solution:

1. **Understanding the Context**: In plants, the movement of sugars (or food) is a crucial process that occurs primarily through the phloem tissue. The question asks about the direction of this movement.

2. **Identifying the Mechanism**: The movement of sugars in plants is explained by the Pressure Flow Hypothesis, also known as the Mass Flow Hypothesis. This hypothesis describes how sugars are transported from the source to the sink.

3. **Defining Source and Sink**:
- **Source**: This is the part of the plant where sugars are produced, typically the leaves where photosynthesis occurs.
- **Sink**: This is the part of the plant where sugars are utilized or stored, such as roots, fruits, or growing tissues.

4. **Direction of Movement**: The movement of sugars in the phloem is not unidirectional (upward or downward) but rather **bidirectional**. This means that sugars can move in multiple directions depending on the needs of the plant.

5. **Reason for Bidirectionality**: The reason for this bidirectional movement is the variable relationship between sources and sinks in plants. Depending on the time of year, growth stage, and environmental conditions, different parts of the plant can act as sources or sinks.

6. **Conclusion**: Therefore, the correct answer to the question regarding the direction of movement of sugars in plants is that it is **bidirectional**.