A vascular bundle which lacks cambium is called

Options

A. Conjoint , and collateral
B. Conjoint , but not collateral
C. Closed , and collateral
D. Bicollateral

Answer

To solve the question "A vascular bundle which lacks cambium is called," we need to analyze the options provided and understand the characteristics of different types of vascular bundles.

### Step-by-Step Solution:

1. **Understanding Vascular Bundles**: Vascular bundles are structures that contain xylem and phloem, which are responsible for the transport of water, nutrients, and food in plants. They can be classified based on the presence or absence of cambium.

2. **Identifying Cambium**: Cambium is a layer of tissue in plants that is responsible for secondary growth. It is found between the xylem and phloem in certain types of vascular bundles.

3. **Analyzing the Options**:
- **Option 1: Conjoint and Collateral**: This option is incorrect because a conjoint vascular bundle typically has cambium present.
- **Option 2: Conjoined but not Collateral**: This option is correct. A vascular bundle that lacks cambium is referred to as a "conjoined" vascular bundle.
- **Option 3: Closed and Collateral**: This option is also incorrect. A closed vascular bundle has no cambium, but it is not specifically referred to as collateral.
- **Option 4: Bicollateral**: This option is incorrect as bicollateral bundles have both xylem and phloem on both sides, and they usually contain cambium.

4. **Conclusion**: The correct answer is that a vascular bundle which lacks cambium is called "Conjoined but not Collateral."

### Final Answer:
A vascular bundle which lacks cambium is called **Conjoined but not Collateral**.