Class11th Zoology Viva -Voce Question Answers. Sesion 2021 New Questions.

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Q35. Name a few insects without wings.

Ans. Lepisma (silver fish), ants termites, bed bug, louse.

Q36. Name the branch of science that deals with the study of insects, fishes, amphibians, reptiles,birds.

Ans. Insects-Entomology, Fishes-lchthyology Amphibia and Reptilia-Herpetology, Birds-
Ornithology.

Q37. To which phyla or class the following animals belong; silver fish, devil fish, sea horse, jelly fish, sting ray, whale, bat.

Ans. Silver fish-arthropoda; devil fish-mollusca; sea horse-osteichthyes; cuttle fish-mollusca, jelly 
fish-coelenterate; sting ray-chondrichthyes; whale-mammalia; bat-mammalia.

Q38. What do you mean by a diploblastic animal ?

Ans. An animal having body cells arranged in 2 layer: (i) ectoderm and (ii) endoderm.

Q39. What are the functions of tentacles in Hydra ?

Ans. They help in catching the prey and in locomotion.

Q40. Name a few coelenterates other than Hydra ?

Ans. Jelly fish, sea-anemone, corals, sea pen, sea fan etc.

Q41. What is the commonest mode of multiplication in Amoeba and Hydra ?


Ans. Amoeba-binary fission; Hydra-budding.

Q42. What are the organs of excretion in Platyhelminthes and annelids ?

Ans. Platyhelminthes-flame cells; annelids-nephridia.

Q13. What are metazoan animals?

Ans. All multicellular organisms are called as metazoans.

Q44. What do you mean by a pseudocoelome ?

Ans. When the body cavity or coelome is interfered by endodermal cells of the alimentary canal, it
becomes a false coelome or a pseudocoelome.

Q45. What is a hermaphrodite animal ? Give examples.

Ans. An animal having both the gonads (testis and ovary) present in the same body is a hermaphrodite
animal e g, earthworm, tapeworm, Hydra etc.

Q46. To which phylum and class earth worm belongs?

Ans. Phylum-Annelida; Class-Oligochata.

Q47. What do you mean by triploblastic, coelomate and bilateral symmetry ?

Ans. Animals developing from three germinal layers (ectoderm, mesoderm and endoderm) are called as triploblastic animals.
Animals with true body cavity is called coelomate. Bilateral symmetry is a symmetry in which body of an animal can be divided into two equal and identical halves through only one plane passing through the centre.

Q48. What is the food of earth worms?

Ans. Soil rich in organic matter.

Q49. Suppose you are given an earthworm, how will you say whether it is male or female?

Ans. Male or female sex organs in earthworms lie within the same body that they are hermaphrodite.

Q50. What is the function of clitellum ? Is it present in all annelids ?

Ans. Citellum helps in formation of formation of cocoon in the process of sexual reproduction. It is
not present in all annelids.

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