Solved Examples on Respiration in Plants

Question1: Aerobic respiratory pathway is appropriately termed  [CBSE PMT’2009]

(a) parabolic

(b) amphibolic

(c) anabolic

(d) catabolic

Answer: b

Solution:

All energy-releasing pathways whether aerobic (requiring oxygen) or anaerobic (not requiring oxygen) begin with a pathway called glycolysis, which occurs in the cytoplasm (cytosol). Aerobic respiratory pathway is appropriately termed amphibolic. Aerobic respiration is the main energy-releasing pathway leading to ATP formation.It occurs in the mitochondria. Aerobic respiration yields thirty-six ATP.

Question2: The energy releasing metabolic process in which substrate is oxidized without an external electron acceptor is called [CBSE PMT’2010]

(a) glycolysis

(b) fermentation

(c) aerobic respiration

(d) photorespiration

Answer: b

Solution:

The energy releasing metabolic process in which substrate is oxidized without an external electron acceptor is called fermentation.

Question3: Which of the following is non-enzymatic phosphorylation?

(a) Formation of fructose 1,6-diphosphate

(b) Formation of dihydroxyacetone phosphate

(c) Formation of 1,3-diphosphoglyceraldehyde

(d) All of the above

Answer: c

Solution:

Formation of 1,3-diphosphoglyceraldehyde is non-enzymatic phosphorylation.