Cambium is absent in :-

Options

A. Pteridophytes
B. Gymnosperms
C. Angiosperms
D. Pteridophytes and gymnosperms

Answer

**Step-by-step Solution:**

1. **Understanding Cambium**: Cambium is a type of meristematic tissue in plants that is responsible for secondary growth. It is located between the xylem and phloem and allows for the increase in thickness of stems and roots.

2. **Identifying the Groups**: The question asks in which of the given plant groups cambium is absent. The options provided are:
- Pteridophytes
- Gymnosperms
- Angiosperms
- Tridophytes (which seems to be a typographical error for "Bryophytes")

3. **Analyzing Each Group**:
- **Pteridophytes**: These are vascular plants that do not produce seeds. They include ferns and are known to lack cambium, hence they do not exhibit secondary growth.
- **Gymnosperms**: These are seed-producing plants that have exposed seeds, such as conifers. They possess cambium and can undergo secondary growth.
- **Angiosperms**: These are flowering plants that also have cambium and can show secondary growth.
- **Tridophytes/Bryophytes**: If we consider this as referring to Bryophytes (like mosses), they do not have cambium and do not show secondary growth.

4. **Conclusion**: Based on the analysis, cambium is absent in Pteridophytes. Therefore, the correct answer is option 1.

**Final Answer**: Cambium is absent in Pteridophytes.

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