Question

Malphigian tubules are the excretory organs in
A. Cockroach
B. Platyhelminthes
C. Ascaris
D. Pila

Answer 1

Hint: Excretory organs are the organs that help in the excretion of the waste of the body. Every living organism generates waste as a result of some metabolic reactions occurring in the body. Excretory system is a biological process by which this unnecessary produced waste gets out from the body of an organism.

Complete Answer:
- Malpighian tubules are the slender tubes that are normally found in the posterior regions of the alimentary canal or the arthropods.
- These tubules work as excretory organs in some insects, myriapods, arachnids and tardigrades.
- These tubules are lined with the microvilli for reabsorption and maintenance of osmotic balance. These tubules contain the action for support.
- The number of malpighian tubules vary from species to species.
- The malpighian tube system is named after the name of seventeenth century anatomist Marcello Malphigi.
- These tubules absorb water, salts and wastes from the hemolymph.
- The wastes are then released from the organism in the form of solid nitrogenous compounds and calcium oxalate.
- These tubules as excretory organs are found in the cockroaches, insects, etc.

Hence, option A is the correct option for this question.

Additional information:

Insect	Excretory organ
Platyhelminthes	Nephridium
Ascaris	Renette gland
Pila	Kidney

Note: The excretory system of the body helps in maintaining internal chemical homeostasis and prevents damage to the body. In the human excretory system kidneys are the units of this system. They help in the removal of nitrogenous waste in the form of urea out from the body.