The correct sequence of various larvae of liver fluke is

Options

A. Miracidium `rightarrow` Sporocyst `rightarrow` Redia `rightarrow` Cercaria `rightarrow` Metacercaria
B. Miracidium `rightarrow` Redia `rightarrow` Sporocyst `rightarrow` Cercaria `rightarrow` Metacercaria
C. Cercaria `rightarrow` Sporocyst `rightarrow` Redia `rightarrow` Miracidium `rightarrow` Metacercaria
D. Cercaria `rightarrow` Redia `rightarrow` Sporocyst `rightarrow` Metacercaria `rightarrow` Miracidium

Answer

To determine the correct sequence of various larvae of the liver fluke, we need to understand the life cycle of the liver fluke and the different larval stages it undergoes. Here’s a step-by-step breakdown of the process:

### Step 1: Identify the First Larval Stage
- The first larval stage of the liver fluke is called **Miracidium**. This is a free-swimming ciliated larval stage that hatches from the egg and seeks out its first host, typically a snail.

### Step 2: Understand the Development of the Sporocyst
- After the Miracidium finds a suitable host, it transforms into the **Sporocyst**. This stage develops within the host and is responsible for producing additional larval forms.

### Step 3: Formation of Radiae
- The Sporocyst produces elongated sacs known as **Radiae**. These are the next larval form that develops from the Sporocyst and contain oral suckers.

### Step 4: Transition to Cercaria
- The Radiae eventually develop into **Cercariae**. This larval form has a tapering head and large penetration glands, allowing it to leave the host and find a new host.

### Step 5: Final Development into Metacercaria
- Finally, the Cercariae can transform into **Metacercariae**. This stage can either develop into an adult fluke or remain in a dormant state until it finds a suitable host.

### Conclusion
Putting all these stages together, the correct sequence of the various larvae of the liver fluke is:
1. Miracidium
2. Sporocyst
3. Radiae
4. Cercaria
5. Metacercaria

Thus, the correct answer is **Option 1: Miracidium → Sporocyst → Radiae → Cercaria → Metacercaria**.

---