Vascular bundles having phloem on the periphery of both outer and inner cambium are
(a) Bicollateral closed
(b) Bicollateral open
(c) Radial
(d) Biradial

Options

A. Bicollateral closed
B. Bicollateral open
C. Radial
D. Biradial

Answer

To solve the question regarding the type of vascular bundles that have phloem on the periphery of both outer and inner cambium, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Vascular Bundles**: Vascular bundles are the strands of vascular tissue in plants, consisting of xylem and phloem. They play a crucial role in the transport of water, nutrients, and food.

2. **Identify the Components**: In the question, we have phloem located on both the outer and inner sides of the cambium. The cambium is a layer of tissue that can produce new xylem and phloem.

3. **Determine the Type of Vascular Bundle**:
- If phloem is located on both sides of the cambium, it indicates that there are two layers of phloem: one on the outer side and one on the inner side.
- This arrangement is specifically known as "bicollateral," which means there are two phloem tissues associated with one cambium.

4. **Check for Cambium Presence**: The presence of cambium indicates that the vascular bundles are "open." If cambium were absent, the bundles would be classified as "closed."

5. **Select the Correct Option**:
- Based on the above analysis, the correct classification for vascular bundles with phloem on both sides of the cambium is "bicollateral open."
- Therefore, the answer is (b) Bicollateral open.

### Final Answer:
(b) Bicollateral open