Question

R.Q for fatty substance/ fat is
(a)Unity
(b)Less than one
(c)Greater than one
(d)Zero

Answer 1

Hint: R.Q stands for the respiratory question which is a dimensionless number that is used for calculations of basal metabolic rate. It is calculated from the production of carbon dioxide.

Complete answer:
Respiratory question for fatty substance/ fat is less than 1. it is the ratio of carbon dioxide consumed to the oxygen evolved. The respiratory quotient can vary from 0.7 to 1.0 if the source of all energy is fat and if all energy came from carbohydrates respectively. The value of the respiratory question is obtained by indirect calorimetry at the patient's bedside which helps guide the planning of nutritional therapy. The values of the respiratory quotient are influenced by the relative contribution from fat, protein, and carbohydrate vichara 0.7, 0.8, and 1.0 respectively. The stoichiometry of the chemical reaction is used to compare the energy fuels by noting the amount of energy which is produced with the complete oxidation of the fuel. The respiratory question varies for different fuels. It is used to determine the predominant fuel which is used by a particular organ of the body such as the brain or a muscle. The blood entering and exiting the organ is analyzed to calculate the respiratory quotient for a particular organ and most of the other oxygen entering and exiting the oraren are bound to the haemoglobin. The carbon dioxide entering and exiting the organ is in the form of bicarbonate.

Additional Information: The respiratory quotient is used in severe cases of chronic obstructive pulmonary disease in the patients that spend a significant amount of energy on respiratory effort. This can be done by increasing the proportion of fats in the diet by which the respiratory question is driving down which causes a relative decrease in the amount of carbon dioxide produced and the respiratory burden to eliminate carbon dioxide and reducing the amount of energy that is spent on respiration. It is used as an indicator for underfeeding which forces the body to utilize fat stores and lower the respiratory question which causes lipogenesis and increases it while overfeeding.
So, the correct answer is 'Less than one'.

Note: In the plant cells, the respiratory quotient is the measure of moles of carbon dioxide evolved to the moles of oxygen absorbed which is one when the substrate is carbohydrate but lower for other substances such as lipids and proteins.