Question

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

Answer 1

Explanation:

Bilateral symmetry -Liver fluke, Taenia

Jointed appendages - Prawn, cockroach, scorpion

Ventral solid central nervous system- Scorpion, spider Cockroach

Metameric segmentation - Annelids

Radial symmetry - Sea anemone

Answer 2

Bilaterally symmetric have mirror symmetry in which body is divided vertically into two equal halves. Sponges have bilateral symmetry but sea anemone and sea cucumber have a radial symmetry.

Arthropod means animals have jointed appendages. Centipedes and prawn are arthropods but sea urchins are echinoderms.  

The ventral nerve cord makes up the nervous system of some phyla of the invertebrates, particularly within the nematodes, annelids and the arthropods. Scorpion, Spider, and cockroach all are arthropods and they have a ventral solid central nervous system.  

Metameric segmentation is the repetition of organs and tissues at intervals along the body of an animal, thus dividing the body into a linear series of similar parts or segments (metameres). It is found in cockroach and not found in Taenia.  

Therefore, the correct answer is option C.