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Biological Classification

Multiple Choice Questions

61.

Nucleic acid is absent in

Virus
Viroid
Prion
Mycoplasma

62.

Which part of an animal virus is not reproduced in multiple copies?

Capsid
Protein
Envelope
Ribosome

63.

Entamoeba histolytica differs from Amoeba in absence of

pseudopodia
contractile vacuole
nucleus
ectoplasm

64.

Most primitive member, in which roots are not present, is

Psilotum
Rhynia
Lycopodium
Selaginella

65.

The process which cannot take place in the absence of viruses is

transformation
conjugation
translocation
transduction

66.

In Whittaker's system of classification, prokaryotes belong to the kingdom

Monera
Protista
Animalia
Fungi

67.

Thigmotaxis is not shown by

Paramecium
Amoeba
Ascaris
Hydra

68.

Polyp phase is absent in

Hydra
Aurelia
Physalia
Obelia

69.
Contractile vacuole in protozoan Amoeba is meant for

respiration

excretion

locomotion

osmoregulation

osmoregulation

Contractile vacuole is the clear rounded, pulsating body present in the posterior part of endoplasm of Amoeba. Found only in fresh water and is concerned by osmoregulation, ie, removal of excess of water.

Plasmalemma is a trilaminar and selectively permeable membrane covering the body functions both in excretion and respiration in Amoeba.

Pseudopodia are finger like and blunt extensions of cell body in protozoans. It is a temporary locomotory structure also used for feeding in Amoeba.