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In life history of liver fluke are prese...

In life history of liver fluke are present (1) Cercaria (2) Metacercaria (3) Sporcyst (4) Redia (5) Miracidium. What is their proper sequence

A

21354

B

53412

C

54213

D

54312

Text Solution

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The correct Answer is:
To determine the proper sequence of developmental stages in the life history of the liver fluke, we can break down the process as follows: 1. **Miracidium**: The life cycle begins when the liver fluke eggs are excreted in the feces of the definitive host (usually a mammal). When these eggs reach water, they hatch into a larval stage called the miracidium. This stage is motile and actively seeks out a suitable intermediate host, typically a snail. 2. **Sporocyst**: Once the miracidium successfully enters the snail, it transforms into a sporocyst. This stage is a sac-like structure that develops within the snail and is responsible for asexual reproduction, leading to the production of numerous larvae. 3. **Redia**: Inside the sporocyst, the next stage of development occurs, leading to the formation of rediae. Rediae are elongated and also capable of asexual reproduction, allowing them to produce more larvae. 4. **Cercaria**: The rediae eventually develop into cercariae, which are free-swimming larvae. These cercariae exit the snail and enter the water, where they can swim and seek out a suitable substrate or host. 5. **Metacercaria**: Finally, the cercariae encyst on vegetation or other surfaces to become metacercariae. This stage is a dormant form that can infect the definitive host when ingested. Thus, the proper sequence of the life history stages of the liver fluke is: 1. Miracidium 2. Sporocyst 3. Redia 4. Cercaria 5. Metacercaria
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