DENDROLOGY

Detailed explanation-1: -The most common respiratory substrate in the body is glucose.-One molecule of glucose gives 38 molecules of ATP, hence it is an instant source of energy.-It is also abundantly available and is stored easily in the body in the form of glycogen. It is also stored in plants in the form of starch or complex sugars.

Detailed explanation-2: -The compounds oxidised during the process of respiration are called as respiratory substrates. Carbohydrates, especially glucose, act as a respiratory substrate.

Detailed explanation-3: -The most preferred respiratory substrates are carbohydrates even though the energy yield is lower compared to that of lipids as oxidation is easier compared to oxidation of other respiratory substrates.

Detailed explanation-4: -Carbohydrates are commonly used as respiratory substrates. Glucose is the most common respiratory substrate. One molecule of glucose produces 38 molecules of ATP, so it’s an instant energy source. It is also abundant and easily stored in the body in the form of glycogen.

Detailed explanation-5: -Thus carbohydrates are used as main source of energy, because these are much easily made available as respiratory substrate in spite of the fact that lipids are much richer source of energy as compared to the carbohydrates. Lipids are used in respiration only when carbohydrates are not available.