Which of the following can maintain high and constant body temperature?
I. Chameleon
II. Struthio
III. Pteropus
IV. Clarias

Options

A. I, II, III and IV
B. III only
C. II and Ill only
D. II, III and IV only

Answer

To determine which of the listed organisms can maintain a high and constant body temperature, we need to classify them based on their thermoregulation:

1. **Identify the types of organisms:**
- **Chameleon (I)**: Chameleons are reptiles, which are generally considered cold-blooded (poikilothermic). Their body temperature varies with the environment.
- **Struthio (II)**: Struthio refers to the ostrich, which is a bird. Birds are warm-blooded (homeothermic) and can maintain a constant body temperature regardless of environmental changes.
- **Pteropus (III)**: Pteropus, commonly known as flying foxes, are mammals. Mammals are also warm-blooded (homeothermic) and can regulate their body temperature.
- **Clarias (IV)**: Clarias refers to a type of fish. Fish are typically cold-blooded (poikilothermic) and their body temperature fluctuates with the environment.

2. **Analyze each option:**
- **Chameleon (I)**: Cannot maintain a constant body temperature (cold-blooded).
- **Struthio (II)**: Can maintain a constant body temperature (warm-blooded).
- **Pteropus (III)**: Can maintain a constant body temperature (warm-blooded).
- **Clarias (IV)**: Cannot maintain a constant body temperature (cold-blooded).

3. **Conclusion:**
The organisms that can maintain a high and constant body temperature are:
- **Struthio (II) - Ostrich**
- **Pteropus (III) - Flying Fox**

Thus, the correct options are II and III.