NEET Biology Digestion And Absorption Based Practice Questions & Answers with Viewers Discussion and Detailed Explanation

Answer: (c)

The absorption of glucose and amino acids is mediated by carrier ions like $Na^{+}$. The concentration of $Na^{+}$ is higher in the intestinal lumen compared to mucosal cells. $Na^{+}$, therefore moves into the cells along its concentration gradient and simultaneously glucose is transported into the intestinal cells. Thus $Na^{+}$ diffuses into the cell and it drags glucose along with it. The intestinal $Na^{+}$ gradient is the immediate energy source. The mechanism for transport of amino acids is same as glucose.

Fructose absorption does not require energy and is independent of $Na^{+}$ transport.