Question

Question 9 Discuss “The respiratory pathway is an amphibolic pathway.”

Class XI Biology Chapter - Respiration in Plants Page 238

Answer 1

Respiration is generally assumed to be a catabolic process because during respiration, various substrates are broken down for deriving energy. Carbohydrates are broken down to glucose before entering respiratory pathways. Fats get converted into fatty acids and glycerol whereas fatty acids get converted into acetyl CoA before entering the respiration. In a similar manner, proteins are converted into amino acids, which enter respiration after deamination.

During synthesis of fatty acids, acetyl CoA is withdrawn from respiratory pathway. Also, in the synthesis of proteins, respiratory substrates get withdrawn. Thus, respiration is also involved in anabolism. Therefore, respiration can be termed as amphibolic pathway as it involves both anabolism and catabolism.

Answer 2

Respiration is a process through which the oxygenated air moves into the lungs and deoxygenated air is expel out. This process aids in the oxidation of the food.

Explanation:

• The process of respiration is an amphibolic pathway.
• The process of respiration involves both catabolism as well as anabolism.
• In the catabolic process the complex molecules are broken down into simple molecules.
• The carbohydrates are broken down into simple sugars whereas the fats are converted into acetyl CoA.
• The proteins are broken into amino acids.
• During the process of synthesis of protein the subrate amino acid is withdrawn this is the anabolic pathway.

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