Q.Differentiate between: Respiration and combustion

Step 1. Catalysis. Respiration is catalysed at every step by specific enzymes inside the living cell. Combustion is an uncatalysed, purely chemical burning reaction, needing no enzymes at all.

Step 2. Number of steps and rate. Respiration proceeds through many small, controlled steps (ten in glycolysis alone, several more through the Krebs cycle and ETC), releasing energy gradually. Combustion occurs in essentially one rapid step, releasing all of the substrate's energy at once.

Step 3. Temperature. Respiration proceeds at normal body/cell temperature. Combustion requires a much higher temperature to initiate and sustain the burning reaction. …

Differentiating respiration from combustion across catalysis, number of steps, temperature, and the fate of the re …

• Treating respiration and combustion as identical simply because both consume organic fuel and (in aerobic respiration) oxygen while releasing CO2 and water - the crucial differences are HOW the energy is released (stepwise/enzymatic vs single-step/uncatalysed) and where it ends up (ATP vs pure heat). …