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Animal Kingdom

Multiple Choice Questions

91.

The intermediate host of Schistosoma is

Snail
mosquito
housefly
sheep

92.

In Mollusca, eye is present over a stalk, called

ostracum
operculum
ommatophores
osphradium

93.

Tuberllarians are free living

nematodes
cestodes
flat worms
trematodes

94.
The characteristic larva of Phylum- 'Coelenterata' is

planula

cysticercus

rhabdiform

wriggler

planula

Coelenterata or Cnidaria shows both sexual and asexual reproduction. The larval stages are planula (Obelia) and ephyra (Aurelia).

Cysticercus is a bladder worm and the third level stage in Taenia. It is visible after the hexacanth is released in the stomach of pig, which goes in the blood circulation and on reaching muscles appears as bladderworm.

Rhabditiform is the first larval stage in Ascaris. It is a non- infective juvenile stage which rests for a week and completes first moult within egg and becomes second stage which is infective.

Wriggler is the larva of mosquito. It is free swimming, active, aquatic larva performing wriggling movements. It has life span of 3- 4 days.