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.