PG TRB ZOOLOGY | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Organization of Coelom, Symmetry and Metamerism.

PG TRB ZOOLOGY ONLINE TEST / QUIZ AS PER LATEST SYLLABUS | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Organization of Coelom, Symmetry and Metamerism.

1. The body cavity formed by the splitting of the mesoderm is called:

Acoelom Pseudocoelom Schizocoelom Enterocoelom

Correct Answer: c) Schizocoelom

2. Which of the following animal groups exhibits radial symmetry in the adult stage?

Annelida Arthropoda Mollusca Echinodermata

Correct Answer: d) Echinodermata

3. True metamerism, where the body is divided into a series of similar segments, is a characteristic feature of:

Platyhelminthes Annelida Nematoda Porifera

Correct Answer: b) Annelida

4. An animal that lacks a body cavity is known as:

Coelomate Pseudocoelomate Acoelomate Haemocoelomate

Correct Answer: c) Acoelomate

5. Bilateral symmetry is strongly associated with which of the following evolutionary trends?

Sessile lifestyle Filter-feeding Cephalization Regeneration

Correct Answer: c) Cephalization

6. Pseudometamerism or strobilization is found in:

Earthworm Cockroach Tapeworm Starfish

Correct Answer: c) Tapeworm

7. Enterocoelom arises from the fusion of:

Mesodermal bands Archenteron pouches Ectodermal folds Blastocoel remnants

Correct Answer: b) Archenteron pouches

8. The type of symmetry where the body can be divided into two equal halves by any plane passing through the central axis is:

Asymmetry Bilateral symmetry Radial symmetry Biradial symmetry

Correct Answer: c) Radial symmetry

9. In which phylum is the coelom reduced and largely replaced by a haemocoel?

Annelida Echinodermata Chordata Arthropoda

Correct Answer: d) Arthropoda

10. The body cavity of Ascaris is a:

True coelom Pseudocoelom Acoelom Haemocoel

Correct Answer: b) Pseudocoelom

11. A sea anemone exhibits which type of body symmetry?

Spherical Bilateral Radial Asymmetrical

Correct Answer: c) Radial

12. Metameric segmentation where segments are externally visible but not internally partitioned is characteristic of:

Annelids Chordates Arthropods Cestodes

Correct Answer: c) Arthropods

13. The coelom which is not lined by mesoderm on all sides is called:

Schizocoel Enterocoel Pseudocoel Haemocoel

Correct Answer: c) Pseudocoel

14. Which of these organisms is asymmetrical?

Hydra Amoeba Butterfly Jellyfish

Correct Answer: b) Amoeba

15. The serial repetition of similar body parts along the longitudinal axis of the body is known as:

Symmetry Cephalization Metamerism Torsion

Correct Answer: c) Metamerism

16. Fasciola hepatica (liver fluke) belongs to which category based on its body cavity?

Acoelomata Pseudocoelomata Eucoelomata Haemocoelomata

Correct Answer: a) Acoelomata

17. Pentamerous radial symmetry is a unique feature of:

Cnidaria Ctenophora Echinodermata Porifera

Correct Answer: c) Echinodermata

18. Homonomous metamerism, where all segments are more or less identical, is seen in:

Prawn Nereis Scorpion Cockroach

Correct Answer: b) Nereis

19. In deuterostomes like chordates, the coelom is of which type?

Schizocoelic Enterocoelic Pseudocoelic Acoelic

Correct Answer: b) Enterocoelic

20. The concentration of sense organs and nervous tissue at the anterior end of the body is:

Metamerism Cephalization Gastrulation Torsion

Correct Answer: b) Cephalization

21. Heteronomous metamerism, where segments are grouped into distinct body regions (tagmata), is characteristic of:

Earthworms Leeches Insects Flatworms

Correct Answer: c) Insects

22. Peripatus is a connecting link and shows a coelom derived from:

Only enterocoely Only schizocoely Both schizocoely and enterocoely It is a pseudocoelomate

Correct Answer: b) Only schizocoely

23. Biradial symmetry is found in which phylum?

Porifera Ctenophora Platyhelminthes Annelida

Correct Answer: b) Ctenophora

24. The term "coelom" was first coined by:

Lamarck Cuvier Haeckel Linnaeus

Correct Answer: c) Haeckel

25. Which of the following is an example of a schizocoelomate animal?

Sea urchin Amphioxus Pila (Snail) Roundworm

Correct Answer: c) Pila (Snail)

26. The segmentation in the body of a leech (Hirudinaria) is an example of:

Pseudometamerism Superficial segmentation True metamerism Asymmetry

Correct Answer: c) True metamerism

27. Which plane divides a bilaterally symmetrical animal into right and left halves?

Frontal plane Transverse plane Sagittal plane Coronal plane

Correct Answer: c) Sagittal plane

28. Coelomic fluid in annelids primarily functions as a:

Digestive medium Circulatory fluid Hydrostatic skeleton Respiratory pigment

Correct Answer: c) Hydrostatic skeleton

29. The larval forms of echinoderms exhibit which type of symmetry?

Radial Bilateral Asymmetrical Spherical

Correct Answer: b) Bilateral

30. The body of a vertebrate is considered to be metamerically segmented due to the presence of:

Serial limbs Serial vertebrae and ribs Skin divisions Paired sense organs

Correct Answer: b) Serial vertebrae and ribs

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