AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The basic filtration unit of the kidney is called the nephron.
Source: Life Processes, Section 5.5.1
The examiner expects the single term "nephron." The passage clearly states: "Each kidney has large numbers of these filtration units called nephrons packed close together." No further detail is needed for a 1-mark question — just name it correctly.