Chapter 197 of 2363 min read

Chordates: Pisces to Mammalia

Why this is asked: Chondrichthyes (sharks, rays) have neither an operculum nor an air bladder, unlike bony fish, so they must swim continuously to avoid sinking; higher up the tree, reptiles and birds have a single occipital condyle where mammals have two, a numeric detail NEET likes to hide inside an option.

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Test yourself

•All living members of the class Cyclostomata are:
•Match List I with List II.
List I List II
A. Pterophyllum I. Hag fish
B. Myxine II. Saw fish
C. Pristis III. Angel fish
D. Exocoetus IV. Flying fish
Choose the correct answer from the options given below:

List I	List II
A. Pterophyllum	I. Hag fish
B. Myxine	II. Saw fish
C. Pristis	III. Angel fish
D. Exocoetus	IV. Flying fish

Open this in the full syllabus view · Zoology

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