Question

Read the following features of organism from (i) to (iii) and identify organism according to features.
(i) Possess lateral appendages for swimming.
(ii) Dioecious and coelomate
(iii) Triploblastic and bilateral symmetry

• A. Nereis
• B. Earthworm
• C. Leech
• D. Star fish

Answer 1

The correct option is A Nereis

Features of Phylum Annelida-

• It may be aquatic (marine and fresh water) or terrestrial; free-living, and sometimes parasitic.
• They exhibit organ-system level of body organisation and bilateral symmetry. They are triploblastic, metamerically segmented and coelomate animals.
• They possess longitudinal and circular muscles which help in locomotion.
• Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming. Reproduction is sexual in them.
• Nereis, an aquatic form, is dioecious, but earthworms and leeches are monoecious.

So, the correct answer is- Nereis.