Which one of the following pairs is wrongly matched?

Options

A. Viroids -RNA
B. Mustard -Synergids
C. Ginkgo -Archegonia
D. Salvinia -Prothallus

Answer

To determine which pair is wrongly matched, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Identify the Options:**
- We have four pairs to evaluate:
- Option 1: Viroid - RNA
- Option 2: Mustard - Synergids
- Option 3: Ginkgo - Archegonia
- Option 4: Salvinia - Prothallus

2. **Evaluate Option 1: Viroid - RNA**
- Viroids are indeed made up of small, circular, single-stranded RNA. They are known to cause diseases in plants.
- **Conclusion:** This pair is correctly matched.

3. **Evaluate Option 2: Mustard - Synergids**
- In flowering plants, synergids are part of the egg apparatus, which is found in the ovule. Mustard, being a flowering plant, does have synergids.
- **Conclusion:** This pair is correctly matched.

4. **Evaluate Option 3: Ginkgo - Archegonia**
- Ginkgo is a gymnosperm and does produce archegonia, which are the female reproductive structures that contain the egg.
- **Conclusion:** This pair is correctly matched.

5. **Evaluate Option 4: Salvinia - Prothallus**
- Salvinia is a heterosporous fern. Its reproductive structures do not originate from a prothallus. Instead, it produces spores that develop into gametophytes, which are different from the prothallus stage seen in some other ferns.
- **Conclusion:** This pair is wrongly matched.

### Final Answer:
The wrongly matched pair is **Option 4: Salvinia - Prothallus**.

---