Question

The excretory organ in a cockroach.
a. Malpighian tubules
b. Raphids
c. Ureters
d. Nephridia

Answer 1

Hint: The excretory system is a passive biological system that involves the removal of excess and unnecessary materials from the body fluids of an organism. It helps to maintain the internal chemical homeostasis and also prevent damage to the body.

Complete answer:
Different types of organisms possess different modes of excretion. And the organs involved in the process of excretion are known as the excretory organ.
The excretory organ is present in the c cockroach and other insects between the junction of hindgut and midgut. The excretory system of cockroach is composed of branched tubules which remove the waste product from the hindgut.

Malpighian tubules are the excretory organ of the cockroach. The excretory system of cockroaches is a unit of osmoregulation. This system is made up of highly branched tubules and it extends part from the alimentary canal. This is a highly convoluted structure that mainly exploits the water and solutes from the haemolymph and ejects the waste product of the hindgut. The excretory system of cockroach is also known as the Malpighian tubules system and consists of Malpighian tubules.

The various nitrogenous waste products such as urea are produced from the wall and different useful ions such as sodium and potassium are moved through active transport. The waste product of the cockroach is mainly made up of nitrogenous substance urea and uric acid. After the reabsorption, the waste product passes to the rectum and is expelled out through the anus.

Hence, the correct answer is option (A).

Additional information:
- Nephridia is the excretory organ that is found in earthworms.
- Raphides are needle-shaped crystals which are formed of calcium oxalate or calcium carbonate and found in parenchyma cells in the leaves.
- The ureters are the tube-like structure that remains attached to each kidney and carries urine from the kidney to the urinary bladder.

Note: Excretion is an important biological process of every living organism. The system of excretion is known as the excretory system and the organs involved in excretion called excretory organs. The excretory organ of the cockroach is known as Malpighian tubules and that system is called the Malpighian tubules system. It also acts as an osmoregulatory unit. These highly branched tubules are extended from the alimentary canal of the cockroach.