Rudimentary seed habit occurs in

Options

A. Lycopodium
B. Selaginella
C. Psilotum
D. Equisetum.

Answer

To answer the question "Rudimentary seed habit occurs in," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Rudimentary Seed Habit**:
- Rudimentary seed habit refers to a reproductive strategy where plants reproduce sexually using seeds that are not fully developed. This means that while seeds are formed, they do not reach full maturity.

2. **Identifying the Options**:
- The options given are:
- Lycopodium
- Selaginella
- Selotum
- Equisetum

3. **Analyzing Each Option**:
- **Lycopodium**: This group does not exhibit rudimentary seed habit as they reproduce via spores.
- **Selaginella**: This plant is known for its unique reproductive strategy where the female gametophyte is retained within the parent sporophyte. This retention allows for the development of the zygote into an embryo, which is a key feature of rudimentary seed habit.
- **Selotum**: This is not a commonly recognized group in the context of seed habits.
- **Equisetum**: Similar to Lycopodium, Equisetum reproduces via spores and does not exhibit rudimentary seed habit.

4. **Conclusion**:
- Based on the analysis, the plant that exhibits rudimentary seed habit is **Selaginella**. This is because it retains the female gametophyte, allowing for the development of the zygote into an embryo, which is a precursor to seed formation.

### Final Answer:
- The correct answer is **Selaginella**.

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