Question

Through mosaic vision, a cockroach can receive
A. Several images of an object with more sensitivity but less resolution
B. Only one images of an object with more sensitivity but less resolution
C. Several images of an object with less sensitivity but more resolution
D. Only one images of an object with less sensitivity but more resolution
E. Only one images of an object with less sensitivity but less resolution

Answer 1

Hint:Cockroaches have two types of eyes: simple and compound. The smaller, simple eyes detect dark and light while the considerably larger compound eyes wrap around the head, allowing them to see from all sides.

Complete answer:
Cockroaches are insect species found in Phylum Arthropoda. The body of the cockroach is separated into three regions namely, head, thorax and abdomen. They have joined appendages. The body is enclosed by a hard exoskeleton made of chitin. There are hardened plates called sclerites on each segment of the exoskeleton which are connected together by a thin, flexible articular membrane.

The capsule of the head has a pair of compound eyes. A pair of thread like antennae emerges from membranous sockets located in front of the eyes. The antennas are sensory in nature and help to monitor the environment. The sense organs of the cockroach are antennas, eyes, maxillary and labial palps, anal cerci, etc. Compound eyes are found on the head's dorsal surface. There are approximately 2,000 hexagonal ommatidia on each eye. A cockroach may receive multiple images of an object with the aid of several ommatidia. This kind of vision is known as mosaic vision with more sensitivity but less resolution, which is common at night.

Thus, the correct answer is option A i.e., Several images of an object with more sensitivity but less resolution.

Note:Unlike human eyes, which only have one lens, the cockroach eyes each have more than 2,000 lenses. The vast number of lenses not only ensures that cockroaches have an outstanding vision; they also make it possible to see more than one object at a time.