AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Answer: B — Respiration
Respiration is the process of acquiring oxygen from outside the body and using it to break down food sources (like glucose) to release energy for cellular needs.
Source: Chapter 5, Section 5.1 – What are Life Processes?
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The textbook (Section 5.1) gives this exact definition: "The process of acquiring oxygen from outside the body, and to use it in the process of break-down of food sources for cellular needs, is what we call respiration." For MCQs, directly recall the definition. Do not confuse with Nutrition (intake of food) or Excretion (removal of wastes).