Select the incorrect w.r.t. cytoplasmic streaming.

Options

A. Symplastic movement may be aided by cytoplasmic streaming
B. Cytoplasmic streaming can be observed in cells of the Hydrilla leaf.
C. Over long distances, substances move by cytoplasmic streaming supplemented by passive transport.
D. Both (A) and (C )

Answer

To solve the question regarding the incorrect statement about cytoplasmic streaming, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Cytoplasmic Streaming**:
- Cytoplasmic streaming is the movement of the fluid substance (cytoplasm) within plant cells. This process helps in the distribution of nutrients, organelles, and other materials within the cell.

2. **Evaluating the First Option**:
- The first option states that "Simplastic movement may be aided by cytoplasmic streaming."
- The symplastic pathway involves the movement of water and solutes through the interconnected protoplasts of neighboring cells via plasmodesmata.
- Cytoplasmic streaming can indeed assist in this movement, making this option **correct**.

**Hint**: Remember that the symplastic pathway connects cells directly, and cytoplasmic streaming can enhance this connection.

3. **Evaluating the Second Option**:
- The second option claims that "Cytoplasmic streaming can be observed in cells of the Hydrilla leaf."
- Hydrilla is an aquatic plant known for its rapid cytoplasmic streaming, especially in its leaves. Thus, this statement is also **correct**.

**Hint**: Consider specific examples of plants known for cytoplasmic streaming, like Hydrilla.

4. **Evaluating the Third Option**:
- The third option states, "Over long distances substances moved by cytoplasmic streaming supplemented by passive transport."
- This statement is **incorrect**. Cytoplasmic streaming is typically effective over short distances. For long-distance transport in plants, the vascular system (xylem and phloem) is primarily responsible, and this transport is often active rather than passive.

**Hint**: Recall that long-distance transport in plants relies on specialized structures (xylem and phloem) rather than cytoplasmic streaming.

5. **Conclusion**:
- After evaluating all options, the incorrect statement regarding cytoplasmic streaming is the third one: "Over long distances substances moved by cytoplasmic streaming supplemented by passive transport."

### Final Answer:
The incorrect statement with respect to cytoplasmic streaming is: "Over long distances substances moved by cytoplasmic streaming supplemented by passive transport."