Bicollateral vascular bundles are found in the stems of

Options

A. Cucurbita
B. Helianthus
C. Solanum
D. 1 and 3

Answer

To solve the question regarding which plants have bicollateral vascular bundles in their stems, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Vascular Bundles**:
- Vascular bundles are structures that contain the xylem and phloem tissues in plants. They are responsible for the transport of water, nutrients, and food.

2. **Define Bicollateral Vascular Bundles**:
- Bicollateral vascular bundles consist of one band of xylem surrounded by two bands of phloem on either side. This arrangement is unique and allows for efficient transport in certain plants.

3. **Identify the Types of Vascular Bundles**:
- Vascular bundles can be classified as open or closed based on the presence of cambium. Bicollateral bundles are typically classified as open.

4. **Examine the Given Options**:
- The options provided are:
1. Kukurbita
2. Helianthus
3. Solanum
4. Option 1 and 3 (Kukurbita and Solanum)

5. **Research the Plant Families**:
- Kukurbita (Cucurbitaceae family) is known to have bicollateral vascular bundles.
- Solanum (Solanaceae family) also exhibits bicollateral vascular bundles.
- Helianthus (Asteraceae family) does not have bicollateral vascular bundles.

6. **Conclusion**:
- Since both Kukurbita and Solanum have bicollateral vascular bundles, the correct answer is option 4, which includes both Kukurbita and Solanum.

### Final Answer:
Bicollateral vascular bundles are found in the stems of Kukurbita and Solanum (Option 4).