All archegoinates have `//` are `:`

Options

A. Vascular plants
B. Spermatophytes
C. Oogamous type reproduction
D. Neck canal cells

Answer

**Step-by-Step Solution:**

1. **Understanding Archegonia**: Archegonia are the female reproductive structures found in certain plants. They produce female gametes (eggs) and are typically found in bryophytes (mosses and liverworts), pteridophytes (ferns), and gymnosperms (conifers).

2. **Analyzing the Options**:
- **Option 1: Vascular Plants**: While gymnosperms are vascular, bryophytes and pteridophytes are non-vascular. Therefore, this option is incorrect as archegonia are not exclusive to vascular plants.

- **Option 2: Spermatophytes**: Spermatophytes refer to seed-producing plants, which include gymnosperms and angiosperms. However, archegonia are not male gametes; they are female gametes. Thus, this option is also incorrect.

- **Option 3: Oogamous Type Reproduction**: Oogamous reproduction involves the formation of a large non-motile egg and a smaller motile sperm. However, archegonia primarily reproduce through spores, making this option incorrect.

- **Option 4: Neck Canal Cells**: Neck canal cells are specific cells found in the archegonium. They are involved in the reproductive process and are characteristic of archegonia. This option is correct.

3. **Conclusion**: Based on the analysis of the options, the correct answer is that all archegonia have neck canal cells.

**Final Answer**: All archegonia have neck canal cells.

---