Question

In the following diagram of a leg of cockroach parts have been indicated by alphabets. Choose the answer in which these alphabets have been correctly matched with the parts which they indicate:

A) a-coxa, b-tibia, c-tarsus, d-femur, e-trochanter
B) a-coxa, b-femur, c-trochanter, d-tarsus, e-tibia
C) a-coxa, b-tarsus, c-femur, d-tibia, e-trochanter
D) a-coxa, b-trochanter, c-femur, d-tibia, e-tarsus

Answer 1

Hint: The cockroaches have jointed appendages present. They have three pairs of legs present are prothoracic legs, mesothoracic legs, and metathoracic legs. These are named according to their attachment to the thorax region of its body.

Complete answer:
The legs of the cockroach have different sizes and different amounts of strength present in them. The three pairs of legs also perform different functions but have the same parts. They have legs segmented into five parts. The parts of the cockroach legs are coxa, trochanter, femur, tibia, and then tarsus. The coxa is the upper part of the leg. The coxa region helps in the attachment of the leg to the thorax region of the body. Then comes the trochanter which acts as the knee of the cockroach. It helps the cockroach to bend its leg. The femur region is regarded as the thigh region of the leg of the cockroach and the tibia resembles the shin bones as present in the human legs. The tarsus is the segmented region that acts like the ankle and foot of the cockroach. It helps the cockroach to climb up on the wall and also helps them to walk upside down.
So, the correct answer is option D, i.e., ‘a-coxa, b-trochanter, c-femur, d-tibia, e-tarsus’.

Note: The parts of the legs of the cockroach have some resemblance to the structure of human legs. The legs are present on the ventral side of the thoracic region and are in pairs. The prothoracic legs are the smallest in size and the metathoracic legs are the longest legs present in cockroaches.