Nocturnal periodicity is exhibited by

Options

A. Wuchereria
B. Ascaris
C. Rhabditiform larva
D. Microfilaria

Answer

To answer the question "Nocturnal periodicity is exhibited by," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nocturnal Periodicity**:
- Nocturnal periodicity refers to the behavior of organisms that are primarily active during the night. This means their activities, such as feeding or movement, occur mainly after sunset.

2. **Identifying the Options**:
- The options provided are:
- A) Vultureria
- B) Ascaris
- C) Reptiform larvae
- D) Microfilaria

3. **Analyzing Each Option**:
- **Vultureria**: This is not a commonly recognized organism in the context of nocturnal activity.
- **Ascaris**: This is a type of roundworm that does not exhibit nocturnal periodicity.
- **Reptiform larvae**: These are larval forms of certain organisms, but they are not specifically known for nocturnal behavior.
- **Microfilaria**: This refers to the larval stage of certain parasitic worms, particularly Wuchereria bancrofti, which is known to exhibit nocturnal periodicity.

4. **Conclusion**:
- After analyzing the options, it is clear that **Microfilaria** (specifically of Wuchereria bancrofti) is the organism that exhibits nocturnal periodicity. This organism is active during the night to avoid difficulties in passing through peripheral capillaries during the day.

5. **Final Answer**:
- The correct answer is **D) Microfilaria**.