Question

Select the CORRECT statements regarding Periplaneta americana.
I. A ring of 6-8 blind tubules called hepatic or gastric caeca is present at the junction of foregut and midgut.
II. Labium and labrum are called lower lip and upper lip, respectively.
III. Tegmina are mesothoracic wings that are opaque, leathery, and dark.
IV. It has a vision known as a mosaic vision with more resolution but less sensitivity.

• A. I, II and III only
• B. I, III and IV only
• C. I, II, III and IV
• D. III and IV

Answer 1

Answer: (A)

Cockroaches are brown or black bodied animals that are included in class Insecta of phylum Arthropoda. It has two types of wings. Forewings (mesothoracic) called tegmina are opaque dark, leathery and cover the hind wings when at rest. The hind wings are transparent, membranous and are used in flight. The mouthparts consisting of a labrum (upper lip), a pair of mandibles, a pair of maxillae and a labium (lower lip). A ring of 6-8 blind tubules called hepatic or gastric caeca is present at the junction of foregut and midgut, which secrete digestive juice. With the help of several ommatidia, a cockroach can receive several images of an object. This kind of vision is known as a mosaic vision. It has more sensitivity, but less resolution is common during the night.