Question

Which of the following is not absorbed by simple diffusion?

(a) Glucose

(b) Amino acids

(c) Sodium ions

(d) Chloride ions

The question was asked by my school teacher while I was bunking the class.

This key question is from Disorders in Digestive System in section Digestion and Absorption of Biology – Class 11

Answer 1

Right answer is (c) Sodium ions

To explain I would say: Sodium ions are not absorbed by simple diffusion. Glucose, amino acids and some electrolytes like chloride ions are generally absorbed by simple diffusion. The rate or passage of these ions depends upon the concentration gradients.