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Larva of 'Culex' floats on surface of wa...

Larva of 'Culex' floats on surface of water with its head

A

Directed upwards

B

Directed downwards

C

Parallel to surface

D

Attached to surface of water.

Text Solution

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The correct Answer is:
To solve the question regarding the orientation of the Culex larva while it floats on the surface of the water, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Organism**: The Culex larva is a type of mosquito larva. It is important to know its behavior and feeding habits to understand its position in the water. 2. **Identify the Position of the Larva**: The Culex larva is known to float on the surface of the water. However, its orientation while doing so is crucial to answering the question. 3. **Observe the Head Position**: When the Culex larva floats, it does not keep its head parallel to the water surface. Instead, it positions its head at an angle. 4. **Determine the Angle of the Head**: The head of the Culex larva hangs downward at an angle of approximately 45 degrees to the surface of the water. This position is essential for the larva to take in air. 5. **Evaluate the Options**: - **Option A**: Directed upwards - Incorrect. - **Option B**: Directed downwards - Correct, as the head hangs downwards for air intake. - **Option C**: Parallel to the surface - Incorrect. - **Option D**: Attached to the surface of water - Incorrect. 6. **Conclusion**: Based on the behavior of the Culex larva, the correct answer is that its head is directed downwards. ### Final Answer: The head of the Culex larva is directed downwards while it floats on the surface of the water. ---
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