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Which of the following features is not present in Periplaneta americana ?

(a) Exoskeleton composed of N­acetylglucos­ amine

(b) Metamerically segmented body

(c) Schizocoelom as body cavity

(d) Indeterminate and radial cleavage during embryonic development

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Ans: (d) Indeterminate and radial cleavage during embryonic development

Sol. In cockroach, determinate and spiral cleavage is found during embryonic development, not indeterminate and radial cleavage.

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