Question

Among malpighian tubules, fat bodies, nephrocytes, uricose glands, gastric caeca, trachea, collaterial glands, phallic glands, crop, and gizzard, how many are concerned with the removal of nitrogenous wastes in the form of uric acid?
A. Six
B. Seven
C. Four
D. Three

Answer 1

Hint: Cockroaches are known to tolerate extreme conditions from very cold to very hot tropical heat. They are nocturnal insects and belong to the order Blattodea. It comprises a comparatively small head as compared to its broad body. Its body is covered by a hard exoskeleton. They are reddish-brown and live-in small holes.

Complete answer:
All the parts are present in the cockroach and have different functions. We’ll explore the function of each and every part and reach the answer.
The hepatic caeca is a 6-8 tubules in the form of a ring which is present at the junction of the foregut and midgut. They secrete digestive juices to help with the process of digestion.
They have a very efficient respiratory system but do not have lungs. They instead draw their air through external valves called spiracles which transport the air directly to the cells with the help of tubes known as trachea.
Collateral glands are present in female cockroaches and help with the secretion of the egg case of ootheca and are present in the third and fourth abdominal segments.
It is a large elongate sac-like structure that lies beneath the mushroom gland and ejaculatory duct. It opens by the side of the male gonopore. The secretion of accessory glands is mixed with the spermatozoa.
The food first enters into the oesophagus and then it enters into the crop. The crop stores the masticated food temporarily in it. It further passes into a gizzard where the food is grinded. The digestive enzymes secreted by the gastric caeca act upon the food in the stomach.
The parts associated with the excretory system of the cockroach are malpighian tubules, uricose gland, fat bodies and nephrocytes which help with the removal of nitrogenous wastes and also aid in the formation of uric acid.
Hence, the correct answer is option(C) four.

Additional Information:
The cockroaches have an open circulatory system and breathe through holes present on their body segments. They can survive without a head but die due to the absence of mouth as it cannot drink water and die of thirst.

Note: They can hold their breath for 40 minutes. They do so in order to compensate for the loss of water from their body. The cockroaches also live alive for a week if the head is removed from the cockroach.