AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The two nitrogenous waste products excreted by human kidneys are urea and uric acid.
It is essential to remove them because these are harmful metabolic wastes. Their accumulation in the body acts as a poison, which can damage body tissues and even lead to death.
Source: Life Processes, Section 5.5.1
The question has two parts — naming the wastes (1 mark) and giving the reason (1 mark). The passage explicitly mentions "urea or uric acid" as nitrogenous wastes filtered by kidneys, and the 'More to Know' box states that accumulation of such wastes can lead to death. Stick to these two points; no extra detail is needed for 2 marks.