Chemical Constituents of Cells · NCERT Biology

The most abundant element in the human body by weight percentage is:

  1. Carbon element
  2. Hydrogen
  3. Oxygen element
  4. Nitrogen
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Correct answer: Oxygen element

Oxygen constitutes approximately 65% of the human body's mass. This is largely because water (which is about 89% oxygen by weight) makes up the majority of the body. Carbon follows at about 18.5%.

Difficulty: Medium Question 19 of 20

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