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Question

Identify the phylum from the statements given below:

(i) Their body has circular cross section.
(ii) They may be free-living, aquatic or terrestrial.
(iii) They are parasitic in plants and animals.
(iv) They are bilaterally symmetrical, triploblastic and pseudocoelomate.

A
Cnidaria
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B
Aschelminthes
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C
Annelida
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D
Arthropoda
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E
Platyhelminthes
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Solution

The correct option is B Aschelminthes
Nematodes/Aschelminthes is a phylum of the animal kingdom that includes bilaterally triploblastic organisms. These organisms have a cylindrical bodies and hence a circular cross-section. They do not possess real organs and are pseudocoelomates. They are often characterized as being parasitic creatures in plants and animals and cause diseases. Some examples are Ascaris and Wuchereria.

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