Question: 1. what is the difference between the trophozoite and cyst stages?
Answer: Excystation produces a trophozoite from the cyst stage, and it takes place in the large intestine of the host after the cyst has been ingested. Cysts are smaller than trophozoites, measuring 40-60 mm across. Cysts are round and have a tough, heavy cyst wall made of one or two layers.