Question

Name the organ in cockroaches which helps in walking.

Answer 1

Hint: There are three pairs of jointed legs in cockroaches attached to the thorax. These legs help in walking and running. These legs have thick bundles of muscles that help that help them to move.

Complete answer:
The thorax region of cockroach bears three pairs of legs. All the three pairs of jointed walking legs are similar in structure and they help the cockroach in its cursorial (fast running) habit. According to their position, legs are named as pro-legs, meso-legs and meta-legs. All the three pairs of jointed legs are similar in structure.
Each leg consists of five segments, namely coxa, trochanter, femur, tibia and tarsus. Coxa is a small, hard podomere that articulates with the thoracic segment between the segments of pleuron and sternum. Coxa is followed by a smaller part called trochanter which is freely movable on the coxa but is fixed to the next segment of the leg that is the femur. Femur is a long and broad part of the leg, bearing sensory bristles. Femur is followed by a long uniformly thick tibia which also bears stout bristles. The last segment is called tarsus that has five movable joints known as podomeres or tarsomeres. The terminal tarsomere is called a pretarsus that bears two sharp curved claws and a soft hairy pad, the pulvillus, in between the two claws. Each tarsomere possesses a soft adhesive pad, the plantula on its lower side. The claws and pads help the cockroach in grasping the substratum firmly.

Note:
The thoracic region of cockroach bears three pairs of jointed legs and two pairs of wings. Each thoracic leg segment bears a pair of walking legs. These are walking legs and they help them in walking and running.