In the most primitive psilopsids, sporangia are

Options

A. In whorls
B. Terminal
C. At leaf bases
D. Over leaves

Answer

To answer the question "In the most primitive psilopsids, sporangia are ___", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Psilopsids**:
- Psilopsids are a group of primitive vascular plants. They are characterized by the absence of true roots and leaves, or if leaves are present, they are only partially differentiated.

2. **Define Sporangia**:
- Sporangia are structures that produce and contain spores. In the context of plants, they are crucial for reproduction as they produce pollen and spores.

3. **Identify the Location of Sporangia in Psilopsids**:
- In the most primitive psilopsids, sporangia are typically found at the terminal regions of the stems. This means that they are located at the tips of the plant's stems.

4. **Evaluate the Options**:
- Given the options, we need to determine where sporangia are located:
- Option A: Not correct.
- Option B: Correct, as sporangia are located in the terminal region of stems.
- Option C: Not correct, as sporangia are not located at leaf bases.
- Option D: Not correct, as sporangia are not found in leaves.

5. **Conclusion**:
- Based on the evaluation of the options, the correct answer is that in the most primitive psilopsids, sporangia are present in the terminal region of stems.

### Final Answer:
In the most primitive psilopsids, sporangia are present in the terminal region of stems (Option B).

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