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. (ii),(iii) and (iv)
B. (i) and (iv)
C. (i) and (ii)
D. (i),(iii) and (iv)

Explanation

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

### Step 1: Analyze Crocodile - 4-chambered heart
- **Crocodile**: Crocodiles are known to have a 4-chambered heart, which consists of two atria and two ventricles. This allows for efficient separation of oxygenated and deoxygenated blood.
- **Conclusion**: This pair is correctly matched.

### Step 2: Analyze Sea Urchin - Parapodia
- **Sea Urchin**: Sea urchins are echinoderms and do not have parapodia. Parapodia are lateral extensions found in some annelids (like polychaetes) and are used for locomotion and gas exchange.
- **Conclusion**: This pair is not correctly matched.

### Step 3: Analyze Obelia - Metagenesis
- **Obelia**: Obelia is a colonial organism that undergoes metagenesis, which is a reproductive cycle that alternates between sexual and asexual generations.
- **Conclusion**: This pair is correctly matched.

### Step 4: Analyze Lemur - Thecodont
- **Lemur**: Lemurs are primates and do not fit the classification of thecodont. Thecodont refers to a type of tooth attachment seen in some reptiles, where teeth are set in sockets. Lemurs do not have this feature.
- **Conclusion**: This pair is not correctly matched.

### Final Summary of Correctly Matched Pairs
- Correctly matched pairs:
- (i) Crocodile - 4-chambered heart
- (iii) Obelia - Metagenesis
- Incorrectly matched pairs:
- (ii) Sea Urchin - Parapodia
- (iv) Lemur - Thecodont

### Final Answer
The correctly matched pairs are:
- (i) Crocodile - 4-chambered heart
- (iii) Obelia - Metagenesis

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