Question

Each thoracic segment of Periplaneta americana is enclosed by four ________ skeletal sclerites : a dorsal________a ventral______ and two lateral _____. The _________ of the prothorax is also called pronotum, which covers the neck and a part of the head.
Complete the above paragraph by choosing the correct sequence of words.

• A. Chitinous, tergum, sternum, pleura, tergum
• B. Proteinaceous, sternum, tergum, pleura, tergum
• C. Chitinous, sternum, tergum, pleura, sternum
• D. Proteinaceous, tergum, pleuron, sternum, tergum

Answer 1

Answer: (A)

Periplaneta americana belongs to class Insecta, of the phylum Arthropoda and hence , it is covered by a chintinous exoskeleton , which is a character of arthropods . Arthropods also show segmentation and hence it's body is divided into various segments. The segments of this chitinous exoskeleton have been named according to their positions , the dorsal sclerites are called as tergum or tergites . The ventral sclerites are called as sternum or sternites and the lateral sclerites are known as pleurons or pleurites.