Excretory System is not associated with

Question

Accepted Answer

The correct option is 2:
The excretory system is the biological system that removes metabolic waste products and excess materials from the body to maintain homeostasis. The ears (Option 2) are sensory organs primarily responsible for hearing and balance; they are part of the auditory system, not the excretory system. Although the ears produce earwax (cerumen), which is a waste substance, the ear's primary physiological role is sensory, and it is not considered one of the major excretory organs. Therefore, the ears are not typically associated with the systemic function of excretion.

The incorrect option is 1:
Kidneys (Option 1) are the primary organs of the excretory system. They filter blood to remove nitrogenous waste (like urea) and excess water, forming urine, which is a major mechanism of excretion.

The incorrect option is 3:
Lungs (Option 3) are also excretory organs because they remove gaseous waste products, primarily carbon dioxide, which is a major metabolic byproduct of cellular respiration. They also excrete water vapor.

The incorrect option is 4:
Skin (Option 4) acts as an excretory organ through sweating. Sweat contains water, salts, and small amounts of urea and lactic acid, which are wastes removed from the body.