Question

9.10 three - host life cycle of the human liver fluke: clonorchis sinensis. check your progress 2.1 list several anatomical and behavioral features of trematodes that suggest adaptation to a parasitic lifestyle. anatomical features behavioral features 2.2 which organs occupy the majority of the body space of the fluke? explain. 2.3 is the digestive system of flukes complete or incomplete? 2.4 what are the two intermediate larval stages in the life cycle of flukes?

Explanation:

2.1 Anatomical features of trematodes for parasitic lifestyle include presence of suckers for attachment (e.g., oral and ventral suckers), reduced sense organs as they don't need to find food in open - environment independently. Behavioral features include specific host - seeking behaviors, like cercariae being attracted to certain hosts.
2.2 Reproductive organs often occupy the majority of the fluke's body space as they need to produce a large number of eggs for successful reproduction in a parasitic life - cycle where many eggs may not reach the proper hosts.
2.3 The digestive system of flukes is incomplete. They have a mouth but lack an anus, and undigested waste is egested through the mouth.
2.4 The two intermediate larval stages in the life - cycle of flukes are the sporocyst and the redia.

Answer:

2.1 Anatomical Features: Suckers, reduced sense organs. Behavioral Features: Host - seeking behaviors.
2.2 Reproductive organs; for high egg production to ensure survival in parasitic life - cycle.
2.3 Incomplete; mouth present, anus absent, waste egested through mouth.
2.4 Sporocyst, redia.