Respiratory Quotient for Proteins — NEET Biology

Which of the following statements regarding Respiratory Quotient (RQ) and its variations are correct? S1: The RQ value is calculated as the ratio of the volume of CO₂ evolved to the volume of O₂ consumed during respiration. S2: In certain succulent plants, like CAM plants, RQ values can fluctuate significantly throughout a 24-hour cycle due to the alternate synthesis and breakdown of organic acids. S3: During anaerobic respiration, the RQ is considered infinite because no carbon dioxide is released in the absence of oxygen. S4: The RQ for carbohydrates like glucose is consistently 1.0 because they possess a balanced proportion of carbon, hydrogen, and oxygen atoms. S5: When proteins are used as respiratory substrates, their RQ value typically falls below 0.7 due to their complex structure and low oxygen content.