Question

Plantulae are found in cockroach upon
A. Pretarsus
B. Femur
C. Trochanter
D. Coxa

Answer 1

Hint: Cockroaches belong to the phylum Arthropoda. The leg in arthropods is a form of joined legs or appendages and are used for walking, climbing and running.

Complete answer:
The body of the cockroaches is divided into three primary regions that is the head, thorax and the abdomen. They bear three pairs of jointed legs, one pair of antennae and a tough, rigid exoskeleton.
The head region bears the eyes, antennae and the mouth parts. The eyes are movable and are compound. The eyes are composed of cells that are photoreceptors in nature and are known as ommatidia. Antenna are movable structures and are often referred to as the antennal flagella. It acts as the sensory organ of cockroaches.
The thorax is the place for attachment of three pairs of appendages or legs. The type of leg depends upon the region of the thorax to which it is attached. The legs in cockroaches are of three types and these are the prothoracic legs, the mesothoracic legs and the metathoracic legs.
The prothoracic legs lie closest to the head of the cockroaches and are the shortest legs. They act as brakes during running. The prothoracic legs are followed by the middle legs or the mesothoracic legs. These types of legs are used to control the speed of movement by moving either backwards or forwards. The very long type of legs are known as metathoracic and are used to move forwards.
The three pairs of legs have the same structural parts and work in the same way. The structure of the leg has an upper portion which is known as the coxa. The coxa is the site of attachment of the leg with thorax. The leg is further divided into trochanter, femur and tibia and the tarsus. The trochanter helps the leg to bend and the femur and tibia resemble the thigh bones.
The tarsus is a segmented portion on the leg and it acts as the ankle and foot. The tarsus consists of pretarsus, plaintulae, pulvillus and terminal claws. Pulvillus are present between the tarsal claws and are lobes or adhesive pads. The distal part of the tarsus is known as pretarsus and it generally bears the claw. The underside of the segments of tarsal in the region of pretarsus, plantulae is present. The plantulae is connected with the pretarsus and it helps the cockroaches to walk or move on smooth surfaces.
> Hence, the option (A) is considered as the correct option.

Note: The appendages or legs of cockroaches are designed for a variety of activities like walking, running and climbing and the structure of legs are divided into three parts. The terminal part of the leg is known as the tarsus. The distal part of the tarsus is the pretarsus which bears the plaintulae.