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Question 47
Give examples for the following
(a) Bilateral, dorsiventral symmetry is found in
___.
(b) Worms causing disease elephantiasis is ___.
(c) Open circulatory system is found in ___ where coelomic cavity is filled with blood.
(d)
___are known to have pseudocoelom.


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Solution

(a) Liver fluke - It belongs to the phylum Platyhelminthes in which body is flattened dorsiventrally and with bilateral symmetry
(b) Filarial worm - It belongs to phylum nematodes. These are very familiar as parasitic worms causing diseases, elephantiasis
(c) Arthropods - In phylum arthropods, circulatory system in which blood does not flow in well-defined blood vessels and the coelomic cavity is filled with blood is called open type of circulatory system
(d) Nematodes - In nematodes pseudocoelom is a fluid-filled body cavity lying inside the external body wall of the nematode that bathes the internal organs, including the alimentary system and the reproductive system


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