Assertion :- Snakes do not have capability to hear the sounds coming from atmosphere.
Reason :- They do not have external ear openings.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Snakes do not have the capability to hear the sounds coming from the atmosphere." This is a claim about the auditory capabilities of snakes.

2. **Evaluating the Reason**: The reason provided is that "They do not have external ear openings." This suggests that the absence of external ear openings is the reason for the assertion.

3. **Analyzing the Assertion**: While it is true that snakes do not have external ear openings, they are not completely deaf. Snakes can detect vibrations and sounds through their body and ground, which means they have some capability to sense their environment.

4. **Analyzing the Reason**: The reason given is partially correct. Snakes lack external ear structures, which limits their ability to hear airborne sounds, but they do possess an inner ear structure that allows them to detect vibrations.

5. **Conclusion**: Therefore, while the assertion is misleading (as snakes can detect vibrations), the reason is also correct in stating that the absence of external ear openings contributes to their limited hearing ability. However, the reason does not fully explain the assertion since snakes can still perceive vibrations.

6. **Final Evaluation**: Based on the analysis:
- The assertion is not entirely true (as snakes can detect vibrations).
- The reason is true but does not correctly explain the assertion.

### Answer Choice:
- The correct answer is: **Option 3** - "If the assertion is true and the reason is false."