Question

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

• A. Animals - Scorpion, Spider, Cockroach
  Morphological feature - Ventral solid central nervous system
• B. Animals - Cockroach, Locust, Taenia
  Morphological feature - Metameric segmentation
• C. Animals - Liver fluke, Sea anemone, Sea cucumber
  Morphological feature - Bilateral symmetry
• D. Animals - Centipede, Prawn, Sea urchin
  Morphological feature - Jointed appendages

Answer 1

The correct option is A Animals - Scorpion, Spider, Cockroach

Morphological feature - Ventral solid central nervous system
Scorpion, spider, and cockroach belong to phylum arthropods and are invertebrates. They possess ventral solid nervous system which consists of a dorsal brain connected with a nerve ring to double ventral nerve cord.
Animals - Cockroach, Locust, Taenia - Cockroach and Locust do not show metamerism. Taenia shows metamerism.
Animals - the Liver fluke, Sea anemone, Sea cucumber - Sea cucumber, sea anemone do not exhibit radial symmetry. Liver fluke exhibits bilateral symmetry.
Animals - Centipede, Prawn, Sea urchin - Centipede and prawn exhibit jointed appendages but not sea urchin does not.