Question

Blind sac body plan is shown by

• A. Roundworms
• B. Annelids
• C. Coelenterates
• D. Arthropods

Answer 1

Answer: (C)

Coelenterates

• A blind sac body plan is characterized by a digestive cavity that has a single aperture, which functions as mouth and anus.
• The cells are specialized and they have a division of labour. Digestion is both intracellular and extracellular.
• Coelenterates are diploblastic animals and possess a blind sac body plan. The body has a single aperture that functions as mouth and anus. The opening is guarded by tentacles which helps to catch the prey. The digestion takes place in the gastrovascular cavity

So, the correct answer is 'Coelenterates'.