Question:

Fate of pyruvic acid during aerobic respiration is

Updated On: Jul 6, 2022
  • lactic acid fermentation
  • alcoholic fermentation
  • oxidative decarboxylation
  • oxidative phosphorylation
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The Correct Option is C

Solution and Explanation

During aerobic respiration, pyruvic acid which is formed during glycolysis enters mitochondrial matrix. It undergoes oxidative decarboxylation to produce $CO_2$ and $NADH$. The product combines with sulphur containing coenzyme $A$ to form acetyl $CoA$. This reaction is catalysed by an enzyme complex pyruvate dehydrogenase. This step is called link reaction or gateway step as it links glycolysis with Krebs' cycle. Pyruvic acid $+ CoA + NAD^+$ $ {->[Mg^{2+}][\text{Pyruvate dehyrogenase}] }$ Acetyl $CoA + CO_2 + NADH + H^+$
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Notes on Respiration in plants

Concepts Used:

Respiration in Plants

Respiration in plants is a process that entails the production of energy in plants. This process can simply be described as the intake of Oxygen and the release of Carbon Dioxide as an outcome of the oxidation of complex organic compounds. Though plants do not have any specific organ to balance the process of respiration, their stems, roots, and leaves do this work at a very low rate than other living beings. The process of respiration is very crucial for the plants to sustain the growth of the plant tissues.

This process can be stated as-

\[C_6H_{12}O_6 + 6O_2 → 6CO_2 + 6H_2O + \text{Energy}\]