Select an incorrect statement regarding vascular bundles

Options

A. In the open vascular bundles of dicotyledons, a meristematic region, cambium is present between the phloem and xylem which is known as the interfascicular cambium.
B. In radial vascular bundles xylem and phloem are arranged in an alternate manner on different radii.
C. In conjoint vascular bundles xylem and phloem are situated at the same radius
D. In collateral vascular bundles phloem is located only on the outside to the xylem. This can either be open or close

Explanation

To determine the incorrect statement regarding vascular bundles, we need to analyze the characteristics of different types of vascular bundles, specifically in dicotyledons. Here’s a step-by-step breakdown:

### Step 1: Understand Vascular Bundles
Vascular bundles are arrangements of xylem and phloem in plants. They can be classified into different types based on their arrangement.

### Step 2: Identify Types of Vascular Bundles
1. **Radial Vascular Bundles**: In these bundles, xylem and phloem are arranged alternately and are located at different radii from the center.
2. **Conjoined Vascular Bundles**: Here, xylem and phloem are situated at the same radius, meaning they are side by side.
3. **Collateral Vascular Bundles**: In these bundles, phloem is located outside the xylem, and they can be classified as either open or closed based on the presence of cambium.

### Step 3: Analyze the Statements
- **Statement 1**: "In radial vascular bundles, xylem and phloem are arranged in an alternate manner and at different radii."
- This statement is **correct**.

- **Statement 2**: "In conjoined vascular bundles, xylem and phloem are situated at the same radius."
- This statement is **correct**.

- **Statement 3**: "In collateral vascular bundles, phloem is located only on the outside of the xylem."
- This statement is **correct** as well.

### Step 4: Identify the Incorrect Statement
Since all the statements provided in the question are correct, we need to look for any statement that contradicts the established facts about vascular bundles. The video transcript indicates that there is confusion regarding the naming of cambium (interfascicular vs. intrafascicular), which may lead to misunderstanding.

### Conclusion
The incorrect statement regarding vascular bundles is likely one that misrepresents the arrangement or characteristics of xylem and phloem in these bundles. However, based on the analysis, all the statements provided in the question are correct. Therefore, if one must select an incorrect statement, it would be one that mislabels the cambium or misrepresents the arrangement of the vascular bundles.