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Q.

Which of the following characteristic features always holds true for the corresponding group of animals ?

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a

Mollusca - Open circulatory system

b

Aschelminthes - All are parasites

c

Platyhelminthes - Fertilisation is external

d

Echinodermata - Excretory system is absent

answer is D.

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Detailed Solution

In all the members of Echinodermata excretory system is absent.In Cephalopoda of Mollusca, closed circulation is seen.Some members of Aschelminthes are free living Ex: Caenorhabditis.Fertilisation in Platyhelminthes is internal.
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