Q.State the significance of respiration.

Respiration is significant because it releases the chemical energy stored in food (as ATP) needed for every life activity; the breakdown intermediates also serve as raw material for synthesising other biomolecules, an...

Respiration provides usable energy (ATP), metabolic intermediates, and maintains gas balance essential for survival.

Respiration is significant to living organisms for several reasons. First and foremost, it is the process by which the chemical energy locked in food molecules (glucose and other organic substrates) is released in a controlled, stepwise manner and captured as ATP, the universal energy currency used to power muscle contraction, active transport, biosynthesis, nerve conduction and every other energy-requiring life process. Second, the intermediate compounds generated during glycolysis and the Krebs cycle (e.g. pyruvate, acetyl-CoA, various organic acids) serve as precursor molecules for synthesising amino acids, fatty acids, and other essential biomolecules, linking respiration to overall metabolism. Third, aerobic respiration involves continuous gas exchange — taking in oxygen (needed as the final electro …