Multiple Choice QuestionsWhich of the following cell type is capable of giving rise to other cell types in sponges?
Thesocytes
Pinacocytes
Cnidocytes
Archaeocytes
Animals having a built in thermostat to maintain constant body temperature are known as
biothermic
poikilothermic
oligothermic
homeothermic
In Mollusca, eye is present over a stalk, called
ostracum
operculum
ommatophores
osphradium
C.
ommatophores
In Mollusca, each eye is located upon a stumpy peduncle called ommatophore.
Mantle, a loose skin fold, dorsally covers Mollusca body and encloses a mantle cavity. It further contains rectum, genital duct, a penis and a small chemoreceptor called Osphradium.
The large, oval aperture or mouth of the shell can be tightly closed by a thick, plate- like operculum attached to the foot.
Moulting hormone is secreted by
corpora cardacum
corpora allata
neurosecretory hormone
prothoracic gland
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