Multiple Choice QuestionsClass Crustacea differ from Insecta in having:
two pairs of antennae
jointed foot
chitinous cuticle
none of these
Which of the following character is presence essentialy in chordates ?
Ventral spinal chord
Dorsal heart
Pharyngeal gill slits
Blood flow in forward direction in ventral blood vessels
Which of the following is not found in Hydra ?
Epithelio-muscular cells
Cnidocyte
Choanocyte
Nerve cells
Which of the following symmetry is found in adult sea-anemone ?
Radial
Biradial
Bilateral
Spherical
Body cavity of adult Ascaris is :
haemocoel
amphicoel
pseudocoel
schizocoel
C.
pseudocoel
Body cavity of Ascaris is called pseudocoel. It is the space between body wall and the alimentary canal which is not lined by mesoderm.
Haemocoel is the primary body cavity of most invertebrates, containing circulatory fluid.
Amphicoel or amphicoelous consists of both anterior and posterior surfaces of the centrum concave.
Schizocoel is a coelom present in the body cavity lying between the digestive tract and the musculature of the body wall.
Pearl oyster is a mollusc which belongs to class :
Cephalopoda
Pelecypoda
Scaphopoda
Gastropoda
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