Question

Mammals may drink water and also get it from

• A. Breakdown of glycogen into glucose
• B. Secretion of saliva
• C. Oxidation of glucose
• D. Conversion of oxyhaemoglobin into haemoglobin

Answer 1

Answer: (C)

Oxidation of glucose

Answer 2

Other cellular activities in the given options do not produce water in mammalian cells.

• Meanwhile, the oxidation of glucose through cellular respiration produces water as one of its byproducts.
• During the electron transport chain stage of cellular respiration, oxygen is present as an electron acceptor.
• When electrons are transferred through the electron transport chain, they bind with oxygen and H+ ions (protons) to form H20.
• This reaction helps to maintain the proton gradient across the membrane of mitochondria.
• Along with the synthesis of ATP through oxidative phosphorylation.
• So, by this reaction, water is produced in the cell.

REACTION: $\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{CO}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ENERGY (ATP)}$
( Here, $\text{C}_6\text{H}_{12}\text{O}_6$ stands for glucose, CO2 stands for carbon dioxide, and H20 stands for water.)
So, the correct answer is (C) : Oxidation of glucose.