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Biological Classification

Multiple Choice Questions

121.

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

Monera
Protista
Animalia
Fungi

122.

Thigmotaxis is not shown by

Paramecium
Amoeba
Ascaris
Hydra

123.

Polyp phase is absent in

Hydra
Aurelia
Physalia
Obelia

124.

Contractile vacuole in protozoan Amoeba is meant for

respiration
excretion
locomotion
osmoregulation

125.

Edible part of mushroom is

basidiocarp
secondary mycelium
primary mycelium
tertiary mycelium

126.
'Clamp connections' are observed in

Basidiomycetes

Zygomycetes

Ascomycetes

Oomycetes

Basidiomycetes

'Clamp connections' are observed in Basidiomycetes. These occur during the nuclear division of the dikaryotic cell. Their main function is to ensure that the sister nuclei of the dikaryon seperates into daughter cells.

Torula stage is observed in Zygomycetes. It produces a hypha, promycelium with terminal sporangium.

In Oomycetes hyphal wall consists of $β$ glucans and cellulose.

In Ascomycetes, spore of sexual stage is known as ascospores and are endogenous in origin. They are produced within sac like structures called asciwhich vary in shape.