How many animals from the following are warm- blooded with 4-chambered heart and oviparous condition?
[Corvus, Struthio, Macropus, Ornithorhynchus, Balaenoptera, Pteropus, Delphinus, Psittacula, Chelone, Calotes, Crocodilus]

Options

A. Six
B. Five
C. Four
D. Seven

Answer

To solve the question, we need to identify how many animals from the provided list are warm-blooded, have a four-chambered heart, and are oviparous. Let's analyze each animal step by step.

### Step 1: Understand the Criteria
1. **Warm-blooded**: Animals that maintain a constant body temperature regardless of the environment.
2. **Four-chambered heart**: The heart is completely divided into four chambers (two atria and two ventricles), allowing for the separation of oxygenated and deoxygenated blood.
3. **Oviparous**: Animals that lay eggs.

### Step 2: Analyze Each Animal
1. **Corvus (Crow)**:
- Class: Aves
- Warm-blooded: Yes
- Four-chambered heart: Yes
- Oviparous: Yes
- **Conclusion**: Fulfills all conditions.

2. **Struthio (Ostrich)**:
- Class: Aves
- Warm-blooded: Yes
- Four-chambered heart: Yes
- Oviparous: Yes
- **Conclusion**: Fulfills all conditions.

3. **Macropus (Kangaroo)**:
- Class: Mammalia
- Warm-blooded: Yes
- Four-chambered heart: Yes
- Oviparous: No (Kangaroos are viviparous)
- **Conclusion**: Does not fulfill all conditions.

4. **Ornithorhynchus (Platypus)**:
- Class: Mammalia
- Warm-blooded: Yes
- Four-chambered heart: Yes
- Oviparous: Yes
- **Conclusion**: Fulfills all conditions.

5. **Balaenoptera (Blue Whale)**:
- Class: Mammalia
- Warm-blooded: Yes
- Four-chambered heart: Yes
- Oviparous: No (Viviparous)
- **Conclusion**: Does not fulfill all conditions.

6. **Delphinus (Dolphin)**:
- Class: Mammalia
- Warm-blooded: Yes
- Four-chambered heart: Yes
- Oviparous: No (Viviparous)
- **Conclusion**: Does not fulfill all conditions.

7. **Pteropus (Flying Fox)**:
- Class: Mammalia
- Warm-blooded: Yes
- Four-chambered heart: Yes
- Oviparous: No (Viviparous)
- **Conclusion**: Does not fulfill all conditions.

8. **Psittacula (Parrot)**:
- Class: Aves
- Warm-blooded: Yes
- Four-chambered heart: Yes
- Oviparous: Yes
- **Conclusion**: Fulfills all conditions.

9. **Chelone (Turtle)**:
- Class: Reptilia
- Warm-blooded: No
- Four-chambered heart: No
- Oviparous: Yes
- **Conclusion**: Does not fulfill all conditions.

10. **Calotes (Garden Lizard)**:
- Class: Reptilia
- Warm-blooded: No
- Four-chambered heart: No
- Oviparous: Yes
- **Conclusion**: Does not fulfill all conditions.

11. **Crocodilus (Crocodile)**:
- Class: Reptilia
- Warm-blooded: No
- Four-chambered heart: Yes (but incomplete)
- Oviparous: Yes
- **Conclusion**: Does not fulfill all conditions.

### Step 3: Count the Animals that Fulfill All Conditions
From the analysis:
- Corvus (Crow)
- Struthio (Ostrich)
- Ornithorhynchus (Platypus)
- Psittacula (Parrot)

**Total Count**: 4 animals fulfill all the conditions.

### Final Answer
The number of animals that are warm-blooded, have a four-chambered heart, and are oviparous is **4**.