Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?

Question

Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?, Animal Morphological features Liver fluke, Sea cucumber Bilateral symmetry, Animal Morphological features Centipede, Prawn, Sea cucumber Jointed appendages, Animal Morphological features Scorpion, Spider, Cockroach Ventral solid central nervous system, Animal Morphological features Cockroach, locust, Taenia Metameric segmentation

MARKS App · Accepted Answer

Scorpion, spider and cockroach have a ventral solid central nervous system, all belonging to phyla Arthropoda. Bilateral symmetry is found in liver fluke, but sea cucumber has radial symmetry. Metamerism is observed in cockroach and locust (both Arthropoda) but not in Taenia (Platyhelminthes) Joint appendages are a characteristic feature of Arthropoda and sea cucumber is excluded.

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Animal	Morphological features
Liver fluke, Sea cucumber	Bilateral symmetry

Animal	Morphological features
Centipede, Prawn, Sea cucumber	Jointed appendages

Animal	Morphological features
Scorpion, Spider, Cockroach	Ventral solid central nervous system

Animal	Morphological features
Cockroach, locust, Taenia	Metameric segmentation