A bicollateral vascular bundle has the following arrangement of tissues
(a) outer phloem-outer cambium-middle xylem-inner cambium-inner phloem
(b) outer xylem-outer cambium-middle phloem-inner cambium-inner xylem
(c) outer phloem-outer xylem - middle cambium
(d) outer cambium-outer phloem-middle xylem-inner phloem-inner cambium

Options

A. outer phloem-outer cambium-middle xylem-inner cambium-inner phloem
B. outer xylem-outer cambium-middle phloem-inner cambium-inner xylem
C. outer phloem-outer xylem - middle cambium
D. outer cambium-outer phloem-middle xylem-inner phloem-inner cambium

Answer

To solve the question regarding the arrangement of tissues in a bicollateral vascular bundle, we will analyze each option provided and determine the correct sequence based on the characteristics of bicollateral vascular bundles.

### Step-by-Step Solution:

1. **Understanding Bicollateral Vascular Bundles**:
- A bicollateral vascular bundle consists of both phloem and xylem. In this arrangement, phloem is located on both sides of the xylem.

2. **Identifying the Components**:
- The components of a bicollateral vascular bundle include:
- Outer Phloem
- Outer Cambium
- Middle Xylem
- Inner Cambium
- Inner Phloem

3. **Analyzing Each Option**:
- **Option (a)**: Outer phloem - Outer cambium - Middle xylem - Inner cambium - Inner phloem
- This arrangement matches the expected sequence for a bicollateral vascular bundle.
- **Option (b)**: Outer xylem - Outer cambium - Middle phloem - Inner cambium - Inner xylem
- This option incorrectly starts with outer xylem, which is not part of a bicollateral arrangement.
- **Option (c)**: Outer phloem - Outer xylem - Middle cambium
- This option is incorrect as it does not represent the correct arrangement of tissues in a bicollateral vascular bundle.
- **Option (d)**: Outer cambium - Outer phloem - Middle xylem - Inner phloem - Inner cambium
- This option incorrectly places the outer cambium before the outer phloem, which is not the correct order.

4. **Conclusion**:
- After analyzing all options, **Option (a)** is the only one that correctly represents the arrangement of tissues in a bicollateral vascular bundle.

### Final Answer:
**The correct arrangement of tissues in a bicollateral vascular bundle is (a) outer phloem - outer cambium - middle xylem - inner cambium - inner phloem.**

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