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Match List I with List II. List I: A. Pleurobrachia; B. Radula; C. Stomochord; D. Air bladder. List II: I. Mollusca; II. Ctenophora; III. Osteichthyes; IV. Hemichordata. Choose the correct answer from the options given below:
Pleurobrachia = Ctenophora (comb jelly II); Radula = Mollusca (rasping organ I); Stomochord = Hemichordata (collar rudimentary structure IV); Air bladder = Osteichthyes (buoyancy III)! Match: A-II, B-I, C-IV, D-III!
Pleurobrachia and Ctenoplana are prominent model organisms representing phylum Ctenophora (A -> II). The mouth of molluscs contains a file-like rasping organ for feeding, called radula (B -> I).
Hemichordates have a rudimentary structure in the collar region called stomochord, a structure similar to notochord (C -> IV). In class Osteichthyes (bony fishes), air bladder is present which regulates buoyancy, preventing them from sinking (D -> III).
A-II, B-I, C-IV, D-III corresponds to Option (4).
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Mismatches Radula with Hemichordata.
Mismatches Pleurobrachia with Hemichordata.
Mismatches Stomochord with Osteichthyes.
Accurately pairs all four anatomical structures and organisms with their taxonomic phyla/classes.
Confusing cartilaginous fishes (Chondrichthyes, which lack air bladder and must swim constantly) with bony fishes (Osteichthyes, which possess air bladder).
"Ctenophora examples: Pleurobrachia and Ctenoplana. Mollusca mouth contains a file-like rasping organ called radula. Hemichordates have a rudimentary structure in collar region called stomochord. In Osteichthyes, air bladder is present which regulates buoyancy."
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