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NEET Biology · Diversity in Living World

Animal kingdom: non-chordates and chordates

Taught in NCERT Class 11 Biology, Chapter 4: Animal Kingdom.

6 verified questions: Easy 0 · Medium 5 · NEET level 1

Sample questions

Sample 1Medium

A figure shows three diagrammatic cross-sections of animal bodies, each with ectoderm outside and endoderm lining the gut. In I there is no body cavity, and mesoderm fills the space between ectoderm and endoderm. In II there is a body cavity, but mesoderm is present only as scattered pouches between ectoderm and endoderm. In III the body cavity is lined by mesoderm on both sides. Which option matches each section to a phylum correctly?

  1. A

    I – Platyhelminthes, II – Aschelminthes, III – Annelida

  2. B

    I – Aschelminthes, II – Platyhelminthes, III – Annelida

  3. C

    I – Platyhelminthes, II – Annelida, III – Aschelminthes

  4. D

    I – Cnidaria, II – Aschelminthes, III – Annelida

Show the answer
The answer is A.

A body with no cavity is acoelomate (Platyhelminthes). A cavity not lined by mesoderm is a pseudocoelom (Aschelminthes). A cavity lined by mesoderm is a true coelom (Annelida and others).

  • B.

    Platyhelminthes are acoelomate (I) and Aschelminthes are pseudocoelomate (II), so the first two are swapped.

  • C.

    Annelids have a true coelom lined by mesoderm (III), and Aschelminthes have a pseudocoelom (II).

  • D.

    Cnidarians are diploblastic and have no mesoderm, so they cannot have the mesoderm-filled body of section I.

NCERT: Class 11 Biology, Chapter 4

Sample 2NEET level

Which one of the following animals is correctly matched with its phylum or class?

  1. A

    Pteropus – Aves

  2. B

    Ancylostoma – Platyhelminthes

  3. C

    Aplysia – Mollusca

  4. D

    Pennatula – Ctenophora

Show the answer
The answer is C.

Aplysia, the sea hare, is a mollusc. Pteropus (flying fox) is a mammal, Ancylostoma (hookworm) belongs to Aschelminthes and Pennatula (sea pen) is a cnidarian.

  • A.

    Pteropus, the flying fox, is a mammal, not a bird.

  • B.

    Ancylostoma, the hookworm, is a roundworm of Aschelminthes.

  • D.

    Pennatula, the sea pen, belongs to Coelenterata (Cnidaria).

NCERT: Class 11 Biology, Chapter 4 (Animal Kingdom), Classification of Animals

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