Classes of Animals MCQs with Answers

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Hagfish belongs to Both Cyclostomata and Agnatha — it is a jawless fish classified under the superclass Agnatha and class Cyclostomata.

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The presence of a notochord is the defining characteristic that distinguishes chordates from non-chordates.

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The animal class characterized by feathers is Birds (Aves).

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The embryological stages of all vertebrates show similarity in anatomical features, providing evidence for common ancestry.

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Scales are present in fishes, serving as a protective outer covering for their bodies.

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Mammals typically possess 12 pairs of cranial nerves, not 10 pairs, which is a characteristic of reptiles and amphibians.

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The phylum Annelida (segmented worms) was the first to develop a true coelom in the animal kingdom.

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Echinoderms are animals that are invertebrates.

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Birds are warm-blooded animals, meaning they can regulate their internal body temperature regardless of the external environment.

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Pseudocoelomates are animals that possess a false body cavity (pseudocoelom), and Nematodes (roundworms) are the classic example of this group.