NEET2016ZoologyStructural Organisation in AnimalsActual
Which of the following features is not present in Periplaneta americana ?
Options
- ASchizocoelom as body cavity
- BIndeterminate and radial cleavage during embryonic development
- CExoskeleton composed of N-acetylglucosamine
- DMetamerically segmented body
Correct answer
B. Indeterminate and radial cleavage during embryonic development
Step-by-step solution
Periplaneta americana shows indeterminate and spiral cleavage. The developing embryo of a cockroach is called nymphs. This nymph undergoes morphological change around 13 times to attain an adult form. Nymphs don’t have wings, but the last two changes develop a structure called a wing pad. This mode of cockroach development by various nymphal stages is called paurometabolous.