Answer:
Ans. For (a), (b) and (c)
refer to 0. 1
(d) Acoelomate
Pseudocoelomate
The animals without coelom
are called as acoelomates e.g., sponges, cnidarians, ctenophores and flatworms.
The animals in which body
cavity is derived from the blastocoels of the embryo are called
pseudocoelomates.
e.g., roundworms.
(e) Notochord
Nerve Cord
Acelomate body plan (e)
Notochord Notochord is the skeletal rod which lies lengthwise between the
central nervous system and the alimentary canal or the gut. Vertebrates
possess it at the young stage of development.
It is a part of skeleton
system
In adults vertebrates,
notocord is replaced by vertebral column.
Nerve cord is the solid
strand of nervous tissue forming a part of central nervous system, especially
in invertebrates.
(f) Polyp
Medusa
Polyp is sessile and
cylindrical form in Aurelia.
Polyp produces medusa
asexually
Medusa is umbrella shaped and
free swimming form in Aurelia.
Medusa forms polyp sexually.
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