Exemplar Problems

Question:

What is the excretory product uric acid, and which groups of organisms are known to excrete it efficiently? What unique organ adaptations are involved in this excretion?

Answer:

Uric acid (C5H4N4O3) is the excretory product primarily excreted by birds, reptiles (except some amphibians), and insects. Birds and reptiles are particularly efficient at conserving water and excreting uric acid as a semi-solid paste. This adaptation helps reduce water loss. In birds, specialized salt glands are involved in the excretion of uric acid, which also aids in salt removal from their bodies.