(B) is the correct answer. Trematodes,commonly called flukes,are either ectoparasites or endoparasites. Their body is unsegmented,leaf-like,and flatte

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Trematoda - Well developed suckers,flat unsegmented body

(B) is the correct answer. Trematodes,commonly called flukes,are either ectoparasites or endoparasites. Their body is unsegmented,leaf-like,and flattened dorso-ventrally. They possess well-developed suckers for attachment to the host.

Class 11 Biology Animal Kingdom Phylum-Platyhelminthes

Medium

Which one of the following is a matching set of the class and some of its main distinguishing features?

A
Sporozoa - Infection by sporozoites,transmission by intermediate host and a contractile vacuole
B
Trematoda - Well developed suckers,flat unsegmented body
C
Arachnida - $3$ pairs of legs,chitinous exoskeleton and poisonous sting
D
Insecta - Compound eyes,segmented body and nephridia