Select incorrect for apoplastic system of pathways

Options

A. this movement is dependent on the gradient
B. apoplastic movement may be aided by cytoplasmic streaming.
C. apoplast does not provide any barrier to water movement and water movement is through mass flow.
D. mass flow of water occurs due to the adhesive and cohesive properties of water.

Answer

To solve the question regarding the incorrect statement for the apoplastic system of pathways, we will analyze each option provided and determine which one does not align with the characteristics of the apoplastic pathway.

### Step-by-Step Solution:

1. **Understanding the Apoplastic Pathway**:
- The apoplastic pathway refers to the movement of water and solutes through the cell walls and intercellular spaces of plant tissues. This pathway does not involve the cytoplasm of the cells.

2. **Evaluating the Statements**:
- **Statement 1**: "The movement is dependent on the gradient."
- This statement is **correct**. The movement of water in the apoplastic pathway is driven by osmotic and pressure gradients.

- **Statement 2**: "Apoplastic movement may be aided by cytoplasmic streaming."
- This statement is **incorrect**. Cytoplasmic streaming is a feature of the symplastic pathway, where water moves through the cytoplasm of cells connected by plasmodesmata. In the apoplastic pathway, water moves through cell walls and does not involve cytoplasmic streaming.

- **Statement 3**: "Apoplast does not provide any barrier to bring water movement."
- This statement is **correct**. The apoplastic pathway allows for free movement of water through the cell walls without barriers, except for the Casparian strip in the endodermis.

- **Statement 4**: "Water movement is through mass flow."
- This statement is **correct**. The movement of water in the apoplastic pathway occurs via mass flow, which is influenced by the cohesive and adhesive properties of water.

3. **Identifying the Incorrect Statement**:
- After evaluating all the statements, we find that **Statement 2** is the incorrect one regarding the apoplastic pathway.

### Final Answer:
The incorrect statement for the apoplastic system of pathways is: **"Apoplastic movement may be aided by cytoplasmic streaming."**

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