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Question
Explain general characteristics of phylum Platyhelminthes.
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Solution
(i) Their body is bilaterally symmetrical and dorsoventrally flattened.
(ii) They are acoelomate and triploblastic animals i.e. their tissues differentiate from three embryonic germ layers.
(iii) Circulatory and respiratory systems and skeleton are absent.
(iv) Their excretory system consists of blind tubules called protonephridia. Blind end of a tubule bears a tuft of cilia or a flagellum called the flame cell.
(v) They are hermaphrodites i.e. both male and female reproductive organs occur in the same individual.
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