What is the primary function of the excretory system in animals?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Removal of waste products .
The primary function of the excretory system in animals is the removal of waste products generated from metabolic activities. This system helps maintain the body’s internal balance by eliminating harmful substances like nitrogenous wastes (urea, ammonia, uric acid), excess salts, and water. Organs such as kidneys, skin, lungs, and liver play key roles in filtering and excreting these wastes. By removing toxic materials, the excretory system prevents their accumulation, which could disrupt cellular functions and harm the body. Overall, it ensures homeostasis, helping animals maintain a stable internal environment essential for survival and health.