The cercarial stage of liverfluke is produced by

Options

A. Sexual reproduction
B. Asexual multiplication
C. Binary fission
D. Parthenogenesis

Answer

To solve the question "The cercarial stage of liver fluke is produced by," we will analyze the life cycle of the liver fluke (Fasciola hepatica) and the reproduction methods involved.

### Step-by-Step Solution:

1. **Identify the Organism**: The organism in question is the liver fluke, scientifically known as *Fasciola hepatica*. It is a digenetic organism, meaning it requires two hosts to complete its life cycle.

2. **Understand the Hosts**: The two hosts involved in the life cycle of the liver fluke are:
- **Primary Host**: Sheep
- **Intermediate Host**: Snail

3. **Life Cycle Overview**: The life cycle begins when the infected sheep excretes eggs in its feces. These eggs hatch into a larval stage called miracidium, which is motile and ciliated.

4. **Miracidium Development**: The miracidium is ingested by the snail (the intermediate host). Inside the snail, the miracidium undergoes further development.

5. **Formation of Cercaria**: Inside the snail, the miracidium develops into a stage called redia, which then produces cercariae. The cercaria is a larval form that is released from the snail.

6. **Reproduction Method**: The cercarial stage is produced through a process of asexual reproduction. This is characterized by the multiplication of cells without the involvement of sexual reproduction.

7. **Conclusion**: Therefore, the cercarial stage of the liver fluke is produced by **asexual reproduction**.

### Final Answer:
The cercarial stage of liver fluke is produced by **asexual reproduction**.

---