Annelida Examples and Classification — NEET Biology

Correct answer: A — A-ii, r; B-i, s; C-i, q; D-iii, p

This question tests the knowledge of reproductive characteristics and other distinctive features of specific annelids and a representative of Aschelminthes. A. Nereis: The NCERT states, 'Nereis,an aquatic form, is dioecious' and 'Aquatic annelids like Nereis possess lateral appendages, parapodia'. So, Nereis is dioecious (ii) and lives in an aquatic habitat possessing parapodia (r). B. Earthworm: The NCERT states, 'earthworms and leeches are monoecious' and 'They possess longitudinal and circular muscles which help in locomotion.' Earthworms are terrestrial. So, Earthworm is monoecious (i) and is terrestrial, using muscles for locomotion (s). C. Leech: The NCERT states, 'earthworms and leeches are monoecious' and mentions 'Hirudinaria (Blood sucking leech)'. So, Leech is monoecious (i) and is ectoparasitic with blood-sucking habit (q). D. Ascaris: Ascaris belongs to Aschelminthes. The NCERT states for Aschelminthes, 'Sexes are separate (dioecious), i.e., males and females are distinct' and 'They are pseudocoelomate animals.' So, Ascaris has separate sexes (iii) and has a pseudocoelomate body plan (p). Thus, the correct match is A-ii, r; B-i, s; C-i, q; D-iii, p.