Question

I. Jellyfish
II. Mollusk
III. Earthworm
Absence of digestive tract is shown by

• A. I, II and III
• B. I only
• C. II only
• D. III only
• E. I and III only

Answer 1

The correct option is B I only

Jellyfish belongs to the phylum Cnidaria. Cnidarians exhibit extracellular digestion, where enzymes break down food particles first and then absorbed by the cell lining of the gastrovascular cavity.
Cnidarians have an incomplete digestive system with only one opening, which serves as both mouth and anus.

While mollusks and earthworm both have complete digestive tracts.

Thus, the correct answer is option B.