Cambium produces
(a) secodary permanent tissue
(b) secondary meristematic tissue
(c) secondary apical meristem
(d) all the above

Options

A. secodary permanent tissue
B. secondary meristematic tissue
C. secondary apical meristem
D. all the above.

Answer

To solve the question regarding what cambium produces, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Cambium**:
Cambium is a type of meristematic tissue found in plants, particularly in dicots. It is responsible for secondary growth, which increases the thickness of the plant.

**Hint**: Remember that cambium is a meristematic tissue involved in growth.

2. **Identifying Types of Tissues Produced by Cambium**:
- **Secondary Permanent Tissue**: Cambium produces secondary vascular tissues, which include secondary xylem (wood) and secondary phloem. These are considered permanent tissues because they are differentiated and serve specific functions in the plant.

**Hint**: Think about what happens during secondary growth in plants.

3. **Evaluating Other Options**:
- **Secondary Meristematic Tissue**: Cambium itself is a meristematic tissue, but it does not produce additional meristematic tissues. Instead, it produces permanent tissues.
- **Secondary Apical Meristem**: Cambium is not involved in forming apical meristems; it is specifically responsible for lateral growth.

**Hint**: Focus on the definitions of meristematic vs. permanent tissues.

4. **Conclusion**:
Based on the analysis, cambium primarily produces secondary permanent tissues (option A). Options B (secondary meristematic tissue) and C (secondary apical meristem) are incorrect. Therefore, the correct answer is:

**Answer**: (a) secondary permanent tissue.

5. **Final Evaluation**:
Since option A is the only correct choice, option D (all of the above) is also incorrect.

### Summary of the Answer:
Cambium produces secondary permanent tissue, specifically secondary xylem and phloem, and does not produce secondary meristematic tissue or apical meristem.