During its life-cycle, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stage respectively
- Redia and miracidium
- Cercaria and redia
- Metacercaria and cercaria
- Miracidium and metacercaria
The Correct Option is D
Solution and Explanation
The larval stages and hosts in the life cycle are as follows:
1. Eggs are passed in the feces of the primary host (usually a mammal, such as a sheep or cow).
2. Miracidium hatches from the egg and infects the intermediate host, which is usually a freshwater snail.
3. Inside the snail, the miracidium undergoes several developmental stages, including sporocysts and rediae.
4. Rediae give rise to cercariae, which are the free-swimming larval stage.
5. Cercariae are released from the snail and encyst as metacercariae on aquatic vegetation.
6. The primary host ingests the metacercariae by consuming contaminated vegetation.
7. Inside the primary host's digestive system, metacercariae excyst and develop into adult liver flukes.
So, the correct answer is (D): Miracidium and metacercaria
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Statement I: Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.
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Concepts Used:
Animal Kingdom
Animals are eukaryotic, multicellular species that belong to the Kingdom Animalia. Every animal has a distinct characteristic. They get energy either by feeding on plants or on other animals. There are millions of species that have been recognized, few shares similar characteristics while others vary drastically.
Kingdom Animalia comprises all animals. In the midst of the five kingdoms, the largest kingdom is the animal kingdom. Animals are multicellular eukaryotes. Though, like plants, they do not possess chlorophyll or a cell wall. Therefore, members of the animal kingdom indicate a heterotrophic mode of nutrition. Kingdom Animalia is further classified into ten different subphyla based on their body designs or differentiations.
The different phyla of the Kingdom Animalia are as follows:
- Porifera
- Coelenterata (Cnidaria)
- Platyhelminthes
- Nematoda
- Annelida
- Arthropoda
- Mollusca
- Echinodermata
- Hemichordata
- Chordata
Read More: Classification of Animal Kingdom