Assertion : Glycolysis is the first step of respiration in which glucose completely breaks into CO ₂ and H ₂ O . Reason : In this process, there is net gain of twenty four molecules of ATP.

Step-by-step solution

Glycolysis is the process of breakdown of glucose or similar hexose sugar into two molecules of pyruvic acid through a series of enzyme mediated reactions, releasing energy (ATP) and reducing power ( NADH ₂ ) . It is the first step of respiration, which occurs inside the cytoplasm and is independent of O ₂ . In glycolysis, two molecules of ATP are consumed during double phosphorylation of glucose to form fructose 1, 6 diphosphate. Four molecules of ATP are produced in the conversion of 1,3-diphosphoglycerate to 3-p