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Differentiate between: (a) Acoelomate ...

Differentiate between:
(a) Acoelomate and pseudocoelomate.
(b) Notochord and nerve cord.
(c) Polyp and medusa.

Text Solution

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(a) Acoelomate animals are with no coelom e.g. sponges, coelonterates and flatworms., While pseudocoelomates have a fales coelom called pseudocoel filled with a watry fluid e.g. members of phylum Aschelminthes e.g. Ascaris (Round worm). (b) Notochord is a solid and unjointed rod of vacuolated cells present on dorsal side above the gut atleast in some stage of development in all the chordates, While nerve cord is the narrow and tubular part of CNS Present above the notochord. (c) Polyp is the fixed and nutritive zooid of Obelia Colony, while medusa is a free-swimming and reproductive zooid of Obelia colony.
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