Asserion: When a beetle moves along the sand within a few tens of centimeters of a sand scorpion, the scorpion immedeately turn towards the beetle and dashes to it.
Reason: When a beetle disturbs the sand, it sends pulses along the sand surface one set of pulses in londitudinal while other set is transvers.

Options

A. If the both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true and the reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false statements.

Explanation

To solve the given question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that when a beetle moves along the sand, a sand scorpion immediately turns towards the beetle and dashes towards it.
- This implies that the scorpion is capable of detecting the movement of the beetle.

2. **Understanding the Reason**:
- The reason given is that when the beetle disturbs the sand, it sends pulses along the sand surface, with one set of pulses being longitudinal and the other set being transverse.
- This suggests that the movement of the beetle creates waves in the sand that can be detected by the scorpion.

3. **Analyzing the Nature of Waves**:
- Longitudinal waves are waves where the particle displacement is parallel to the direction of wave propagation. In this case, the beetle's movement creates compressions and rarefactions in the sand.
- Transverse waves are waves where the particle displacement is perpendicular to the direction of wave propagation. The disturbance caused by the beetle can also create such waves.

4. **Detection by the Scorpion**:
- The scorpion has specialized sensory organs in its legs that can detect vibrations in the sand.
- When the beetle moves, the longitudinal waves reach the scorpion first, alerting it to the presence of the beetle.

5. **Conclusion**:
- Since the assertion is true (the scorpion does turn and dash towards the beetle) and the reason is also true (the beetle does send out waves), and the reason correctly explains why the assertion is true, we conclude that both the assertion and the reason are correct, and the reason is the correct explanation of the assertion.

### Final Answer:
Both the assertion and the reason are correct, and the reason is the correct explanation of the assertion.

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