Arrange the following elements in descending order of their contribution to percentage weight of the human body.
- B, A, C, D
- A, B, C, D
- C, A, B, D
- B, C, D, A
Answer
(2) A, B, C, D
Solution
Percentage weight of elements in the human body:
Oxygen (A) ≈ 65%
Carbon (B) ≈ 18.5%
Hydrogen (C) ≈ 9.5%
Nitrogen (D) ≈ 3.3%
∴ Descending order: Oxygen > Carbon > Hydrogen > Nitrogen, i.e., A, B, C, D.
(NCERT Table 9.1 prints 0.5% for hydrogen in the human body, a misprint for 9.5%.)
Answer: (2)