Respiration In Plants

The respiratory quotient (RQ) is used in calculations of basal metabolic rate (BMR). It is the ratio of the volume of carbon dioxide produced by the body to the volume of oxygen consumed by the body in respiration over a period of time. It depends on the type of respiratory substrate used during respiration. RQ of fat is about of carbohydrate is of organic acids is above of protein is RQ value gives information about the source of energy an animal is using.

Tricarboxylic acid cycle or citric acid cycle or Krebs cycle takes place in matrix of mitochondria. Acetyl coenzyme-A is connecting link between cycle and EMP pathway, while oxaloacetate is acceptor molecule. Substrate level phosphorylation takes place during the conversion of succinyl Co-A to succinic acid,
Succinyl Co-A + ADP + succinic acid + ATP + Co-A

Respiratory Quotients is the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed in respiration over a period of time. Its value is one, zero, more than or less than .
slightly more than unity is found when organic acids are broken down as respiratory substrates under aerobic conditions.
For example,
(Malic acid) or