Which of the following pairs are correctly matched ?
`{:(,"Animals",,"Morphological features"),("(i)","Crocodile",-,"4-chambered heart"),("(ii)","Sea urchin",-,"Parapodia"),("(iii)","Obelia",-,"Metagenesis"),("(iv)","Lemur",-,"Thecodont"):}`

Options

A. only 1 and 4
B. only 1 and 2
C. 1, 3 and 4
D. 2, 3 and 4

Answer

To determine which pairs are correctly matched between animals and their morphological features, we will analyze each pair one by one.

### Step-by-Step Solution:

1. **Crocodile - 4-chambered heart**
- Crocodiles belong to the class Reptilia.
- They are unique among reptiles because they possess a 4-chambered heart, which is typically found in birds and mammals.
- **Conclusion**: This pair is correctly matched.

2. **Sea urchin - Parapodia**
- Sea urchins are echinoderms and do not possess parapodia.
- Parapodia are fleshy protrusions found in annelids (segmented worms).
- **Conclusion**: This pair is incorrectly matched.

3. **Obelia - Metagenesis**
- Obelia is a colonial organism that exhibits metagenesis, which is a form of alternation of generations between sexual and asexual forms.
- **Conclusion**: This pair is correctly matched.

4. **Lemur - Thecodont**
- Lemurs are primates, and they have thecodont dentition, where the teeth are embedded in sockets in the jaw.
- **Conclusion**: This pair is correctly matched.

### Final Conclusion:
The correctly matched pairs are:
- (i) Crocodile - 4-chambered heart
- (iii) Obelia - Metagenesis
- (iv) Lemur - Thecodont

Thus, the answer is that the pairs (i), (iii), and (iv) are correctly matched.