What is living? · NCERT Biology

Which statement correctly describes 'Metabolism'?

  1. It is the sum of all chemical reactions in a living body
  2. It occurs only within genuinely complex multicellular organisms
  3. In-vitro isolated metabolic reactions are living organisms
  4. It is equally a characteristic of non-living objects
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Correct answer: It is the sum of all chemical reactions in a living body

Metabolism is the sum total of all biochemical reactions in a cell or organism and is a defining feature of life. While isolated reactions can be performed in a test tube (in-vitro), these are living reactions but not living organisms themselves.

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