Question

Well developed digestive system is present in

• A. Cnidarians, prawns and earthworms
• B. Grasshoppers, frogs and houseflies
• C. Amoeba, Hydra and dog
• D. Sponges, flatworms and earthworms

Answer 1

The correct option is B Grasshoppers, frogs and houseflies

Porifera (sponges), Platyhelminthes (flatworms) and Cnidaria (Hydra) do not have a well-developed digestive system. They have 'blind-sac' body plan, with an opening that serves as both the mouth and the anus, and a gastrovascular cavity where digestion takes place.

Earthworms and Arthropods (Grasshoppers, houseflies) have a well-developed digestive system, having a compartmentalized alimentary canal and two-openings, anterior as mouth and posterior as the anus.

The vertebrates (frogs) also have a well developed digestive system.

Hence, the correct answer is 'Grasshoppers, frogs and houseflies'