Eucalyptus is different from Cedrus in the presence of

Options

A. Syngamy
B. Seeds
C. Archegonia
D. Triple fusion

Answer

To determine how Eucalyptus is different from Cedrus, we need to analyze the characteristics of both plants, focusing on their reproductive structures and seed formation.

### Step-by-Step Solution:

1. **Identify the Plant Types**:
- Eucalyptus is classified as an angiosperm (flowering plant).
- Cedrus is classified as a gymnosperm (non-flowering plant).

2. **Understand Syngamy**:
- Syngamy refers to the fusion of gametes.
- This process occurs in both angiosperms and gymnosperms, so it is not a distinguishing factor between Eucalyptus and Cedrus.

3. **Examine Seed Formation**:
- In angiosperms like Eucalyptus, seeds are enclosed within a fruit, making them protected and not naked.
- In gymnosperms like Cedrus, seeds are exposed (naked) and not enclosed by any fruit structure.

4. **Consider Archegonia**:
- Archegonia is the female reproductive structure that produces eggs.
- Both Eucalyptus and Cedrus possess archegonia, so this is not a distinguishing factor.

5. **Look at Triple Fusion**:
- Triple fusion is a process unique to angiosperms where one male gamete fuses with the egg (forming a diploid zygote) and the other fuses with two polar nuclei (forming a triploid endosperm).
- This process does not occur in gymnosperms, making it a characteristic feature of angiosperms.

6. **Conclusion**:
- The primary difference between Eucalyptus and Cedrus lies in their seed formation. Eucalyptus has seeds that are enclosed within a fruit, while Cedrus has naked seeds.

### Final Answer:
Eucalyptus is different from Cedrus in the presence of enclosed seeds (in fruits) as opposed to naked seeds.