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Answer: 2. Indeterminate and radial cleavage during embryonic development

Key idea: Cockroach (Periplaneta) is a protostome arthropod, so its embryonic cleavage is determinate and is not the radial, indeterminate type.

Indeterminate radial cleavage is a feature of deuterostomes (e.g. chordates, echinoderms). The other statements apply: the coelom is a schizocoelom (reduced and filled as a haemocoel), the exoskeleton is chitin (a polymer of N-acetylglucosamine), and the body is metamerically segmented. Hence (2).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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