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Question

Which of the following is not present in Periplaneta americana?

A
Schizocoelom as body cavity
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B
Indeterminate and radial cleavage during embryonic development
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C
Exoskeleton composed of N-acetylglucosamine
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D
Metamerically segmented body
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Solution

The correct option is B Indeterminate and radial cleavage during embryonic development
The body of Periplaneta americana is metamerically segmented and is divided into head, thorax and abdomen. The entire body is covered by a hard chitinuous exoskeleton which is composed of N-acetylglucosamine.
Cockroach is a eucoelomate. True eucoelomates is of two types; schizocoelom (schizocoel) and enterocoelom (enterocoel).
Schizocoelom - It develops as a split in the mesoderm sheet. It is found in annelids, arthropods (cockroach), molluscs.
Cleavage is the division of cells in an early embryo. It is of two types- Determinate and Indeterminate.
Indeterminate cleavage is the division of an egg into cells, each of which has the potential of developing into a complete organism.
Determinate cleavage is the division of an egg into cells, each of which does not have the capacity to develop into a complete organism.
Cockroach has determinate cleavage during embryonic development and it develops into nymph, which is a fully developed cockroach

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