In which of the following the angiosperms resemble the Gymnosperms

Options

A. nature of endosperm
B. presence of vessels
C. siphonogamy
D. double fertilization.

Answer

To determine in which of the following aspects angiosperms resemble gymnosperms, let's analyze the provided options step by step:

1. **Nature of Endosperm**:
- In angiosperms, the endosperm is triploid (3n) and is formed after fertilization.
- In gymnosperms, the endosperm is haploid (n) and develops from the female gametophyte.
- **Conclusion**: This option is incorrect as the nature of endosperm differs between angiosperms and gymnosperms.

2. **Presence of Vessels**:
- Angiosperms have vessels in their xylem which facilitate efficient water transport.
- Gymnosperms primarily have tracheids for water transport and do not possess vessels.
- **Conclusion**: This option is incorrect as the presence of vessels is unique to angiosperms.

3. **Siphonogamy**:
- Siphonogamy refers to the process where pollen grains develop into pollen tubes to deliver male gametes.
- Both angiosperms and gymnosperms exhibit siphonogamy.
- **Conclusion**: This option is correct as both groups share this reproductive feature.

4. **Double Fertilization**:
- Double fertilization occurs in angiosperms where one male gamete fertilizes the egg cell to form the zygote, and the other fuses with the central cell to form the endosperm.
- Gymnosperms do not undergo double fertilization.
- **Conclusion**: This option is incorrect as double fertilization is exclusive to angiosperms.

**Final Answer**: The correct answer is **siphonogamy** (Option C), as it is the only feature in which angiosperms and gymnosperms resemble each other.