The diagram below illustrates the life of an endoparasite of livestock. Use it to answer the question below The stage of the life cycle labelled II enters t...

Answer Details

The stage of the life cycle labelled II that enters the secondary host is called a sporocyst. The sporocyst is a sac-like structure that develops from the miracidium (the first-stage larva) in the intermediate host. Inside the sporocyst, asexual reproduction occurs, producing multiple rediae (the next stage of the parasite's development). The rediae then produce cercariae (the next stage), which are released from the intermediate host and can infect the final host (livestock in this case) by burrowing through the skin or by ingestion. The bladder worm is the larval stage of another type of parasite, while the miracidium and redia are earlier stages in the life cycle of the same parasite.