Dicot stem has open vascular bundles . They are called 'open' because they

Options

A. Are surrounding by pericycle but no endodermis
B. Are capable of producing secondary xylem and phloem
C. Possess conjunctive issue between xylem and phloem
D. Are not surrounded bye Pericycle

Answer

To answer the question about why dicot stems have open vascular bundles, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Vascular Bundles**:
- Vascular bundles are the part of the plant that contains the xylem and phloem, which are responsible for the transport of water, nutrients, and food throughout the plant.

2. **Types of Vascular Bundles**:
- Vascular bundles can be classified as 'open' or 'closed'.
- Open vascular bundles contain a cambium layer, while closed vascular bundles do not.

3. **Presence of Cambium**:
- In dicot stems, the vascular bundles are called 'open' because they contain a layer of cambium situated between the xylem and phloem.
- Cambium is a type of meristematic tissue that has the ability to divide and produce new cells.

4. **Function of Cambium**:
- The cambium allows for the production of secondary xylem (wood) and secondary phloem as the plant grows. This is crucial for the increase in girth of the stem.

5. **Conjunctive Tissue**:
- In dicot stems, there is also conjunctive tissue present between the xylem and phloem, which supports the structure of the vascular bundles.

6. **Comparison with Monocots**:
- In contrast, monocot stems have closed vascular bundles, meaning they lack cambium and therefore do not produce secondary xylem and phloem.

7. **Conclusion**:
- Thus, dicot stems are referred to as having 'open' vascular bundles due to the presence of cambium, which allows for secondary growth.