Shod distance transport of substances occur by! through

Options

A. Diffusion
B. Cytoplasmic streaming
C. Vascular system
D. Both (1) & (2)

Answer

To solve the question regarding the short distance transport of substances, we will analyze each option provided:

1. **Understanding the options**:
- **A. Diffusion**: This is a process where molecules move from an area of higher concentration to an area of lower concentration. It is a passive process and is effective over short distances.
- **B. Cytoplasmic streaming**: This refers to the movement of the cytoplasm within a cell, which helps in the distribution of nutrients and organelles. It is also effective for short distances within the cell.
- **C. Vascular system**: This includes structures like xylem and phloem that transport water, nutrients, and food over long distances in plants. This is not suitable for short distance transport.
- **D. Both A and B**: This option suggests that both diffusion and cytoplasmic streaming are mechanisms for short distance transport.

2. **Analyzing the effectiveness of each option**:
- **Diffusion** is indeed a primary method for short distance transport, especially in cells where substances need to move across membranes.
- **Cytoplasmic streaming** also facilitates the movement of materials within cells, making it suitable for short distances.
- The **vascular system** is primarily involved in long-distance transport, making it irrelevant for this question.

3. **Conclusion**:
- Since both diffusion and cytoplasmic streaming are effective for short distance transport, the correct answer to the question is **D. Both A and B**.

### Final Answer:
The short distance transport of substances occurs through **D. Both A and B** (Diffusion and Cytoplasmic streaming).