First slide

Basis of Classification

Question

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

Moderate

A

Exoskeleton composed of N-acetylglucosamine
B

Metamerically segmented body
C

Schizocoelom as body cavity
D

Indeterminate and radial cleavage during embryonic development

Solution

Indeterminate and radial cleavage during embryonic development is not a feature of Periplaneta americana.
The cockroach undergoes protostome development. Protostomes undergo spiral cleavage at the eight-celled stage and show determinate development, in which the development fate of each cell in the adult organism is already determined.

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