Question

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

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

Answer 1

The correct option is A Indeterminate and radial cleavage during embryonic development

Indeterminate and radial cleavage is a feature of deuterostomes while cockroach is an example of protostomes. Protostomes develop the mouth before the anus, they also have spiral and determinate cleavage. Spiral cleavage refers to the rotational pattern of the dividing cells, and determinate means that each cell has a certain fate - they cannot become whole organisms if isolated from other cells.

So, the correct option is 'Indeterminate and radial cleavage during embryonic development'.