Which of the following pairs are correct matched ?
`{:("Animal","Feature"),((i)"Crocodile","4-chambered heart"),((ii)"Platypus","-Viviprity"),((iii)"Pigeon","-Pneumatic bones"),((iv)"Saw fish","- Ctenoid scales"):}`

Options

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

Answer

To determine which pairs of animals and their features are correctly matched, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Crocodile - 4-chambered heart**:
- Crocodiles are unique among reptiles as they possess a 4-chambered heart, which is an adaptation that allows for more efficient circulation.
- **Conclusion**: This pair is correctly matched.

2. **Platypus - Viviparity**:
- Viviparity refers to giving birth to live young. However, the platypus is an oviparous animal, meaning it lays eggs.
- **Conclusion**: This pair is incorrectly matched.

3. **Pigeon - Pneumatic bones**:
- Pneumatic bones are hollow bones that contain air spaces, which are characteristic of birds, including pigeons. This adaptation helps reduce body weight for flight.
- **Conclusion**: This pair is correctly matched.

4. **Sawfish - Ctenoid scales**:
- Sawfish have a different type of scale known as plecoid scales, not ctenoid scales. Ctenoid scales are typically found in some bony fish, but not in sawfish.
- **Conclusion**: This pair is incorrectly matched.

### Final Analysis:
From the analysis:
- Correctly matched pairs:
- (i) Crocodile - 4-chambered heart
- (iii) Pigeon - Pneumatic bones
- Incorrectly matched pairs:
- (ii) Platypus - Viviparity
- (iv) Sawfish - Ctenoid scales

Thus, the correct pairs are (i) and (iii).

### Correct Answer:
The correct answer is pairs (i) and (iii).

---