Question

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

• A. Four distinct regions – head, thorax, abdomen and legs
• B. Exoskeleton composed of N-acetylglucosamine
• C. Metamerically segmented body
• D. Schizocoelom

Answer 1

The correct option is A Four distinct regions – head, thorax, abdomen and legs


Periplaneta americana is the scientific name of cockroach.

The body of a cockroach consists of three distinct regions - head, thorax and abdomen.

The legs are present in the thorax region.

Exoskeleton of a cockroach is made up of chitin. Chitin is a polysaccharide which is made up of N-acetylglucosamine.

In cockroaches, the coelom is formed by the splitting of mesoderm and hence is called a schizocoelomate animal.

In cockroaches, the body is divided into segments and there is repetition of certain body parts in every segment and hence it exhibits metamerism.