The cobra ( Naja naja ) can be distinguished by the presence of

Options

A. Agile habit
B. Black color
C. Hood
D. Hood and third largest supra labials.

Answer

To solve the question regarding how the cobra (Naja naja) can be distinguished, we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a unique feature of the cobra (Naja naja), also known as the Indian Cobra.

2. **Analyzing the Options**:
- **Option A: Agile Habitat**: This option suggests that the cobra can be distinguished by its agile habitat. However, many snakes exhibit agility, so this is not a unique feature of the Indian Cobra.
- **Conclusion**: Incorrect.

- **Option B: Black Color**: This option states that the cobra can be distinguished by its black color. Indian Cobras can actually be found in various colors, including yellow, reddish, and grey. Therefore, this characteristic is not unique to the Indian Cobra.
- **Conclusion**: Incorrect.

- **Option C: Hood**: This option mentions the presence of a hood. While the Indian Cobra does have a hood, many other snake species also possess this feature. Thus, it is not unique to the Indian Cobra.
- **Conclusion**: Incorrect.

- **Option D: Third Largest Supralabials**: This option refers to the scales on the upper jaw of the Indian Cobra. Specifically, the Indian Cobra has seven supralabials, and the third one is the largest. This is a distinctive feature that can help identify the species.
- **Conclusion**: Correct.

3. **Final Answer**: The unique feature that distinguishes the cobra (Naja naja) is the presence of the third largest supralabial scale among its seven supralabials.