What is living? · NCERT Biology

What is the primary reason why it is difficult to define the 'living state' of a patient in a coma?

  1. They completely lack any form of metabolic activity of any kind
  2. They have lost the ability to respond to every stimulus
  3. They are supported by machines and lack self-consciousness
  4. Their body cells have entirely stopped dividing
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Correct answer: They are supported by machines and lack self-consciousness

A comatose patient may be kept alive with machines and lacks self-consciousness, yet still shows some properties of life such as metabolism. Because they exhibit some defining features of life but not others, they represent a boundary case in the definition of life.

Difficulty: Medium Question 11 of 38

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