The vascular cambium is generally more active on the .... A .... and product more.... B......
What is A and B respectively ?

Options

A. A - out side
B - secondary xylem
B. A - Inner side
B - secondary xylem
C. A - Inner side
B - secondary phloem
D. A - outer side
B - secondary phloem

Answer

To solve the question regarding the vascular cambium, we need to identify the two components A and B in the statement: "The vascular cambium is generally more active on the .... A .... and produces more .... B ....".

### Step-by-Step Solution:

1. **Understanding Vascular Cambium**:
- The vascular cambium is a type of lateral meristem responsible for the secondary growth in plants. It is located between the xylem and phloem tissues.

2. **Activity of Vascular Cambium**:
- The cambium is more active on one side compared to the other. In woody plants, the cambium produces secondary tissues, which include secondary xylem (wood) and secondary phloem (part of the bark).

3. **Identifying Side of Activity**:
- The vascular cambium is generally more active on the inner side. This means it produces more secondary xylem (wood) towards the inside of the plant.

4. **Identifying the Product**:
- The primary product of the vascular cambium's activity on the inner side is secondary xylem. The outer side of the cambium produces secondary phloem, but the question asks for the side where it is more active and the product of that activity.

5. **Final Answer**:
- Therefore, A is "inner side" and B is "secondary xylem".

### Conclusion:
- A = inner side
- B = secondary xylem