Question

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

	Animals	Morphological features
(a)	Scorpion, spider, cockroach	- Ventral solid central nervous system
(b)	Cockroach, locust, Taenia	- Metameric segmentation
(c)	Liver fluke, sea anemone, sea cucumber	- Bilateral symmetry
(d)	Centipede, prawn, sea urchin	- Jointed appendages

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (A)

Scorpion, spider and cockroach are invertebrates and belong to the Phylum Arthropoda, therefore they have ventral solid central nervous system. In cockroach and locust, the body is segmented externally. In Taenia, the body is without true segments. Liver fluke has bilateral symmetry, sea anemone has radial symmetry and sea-cucumber has bilateral symmetry in larval form and radial symmetry in adult form. Centipede and prawn have jointed appendages while sea urchin does not have jointed appendages.