Question

Contribution of passive water absorption to total water absorption is

• A. 50%
• B. 70%
• C. 80-90%
• D. 96-100%

Answer 1

Answer: (D)

96-100%

Contribution of passive water absorption to total water absorption is maximum and ranges to 96 to 100 percent because it takes place without expenditure of energy. The molecules move from higher concentration to the lower concentration which is towards the gradient. It takes place by two methods facilitated diffusion and simple diffusion.

In facilitated diffusion, the ions like sodium, glucose and potassium passes using carrier proteins through the cell membrane without energy along the concentration gradient. In diffusion, the ions or molecules randomly diffuses through the semipermeable membrane along the concentration gradient.

So, the correct answer is option D.