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Respiration In Plants — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYRespiration In Plants3 Marks
Question
Explain various steps involved in cellular respiration.
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Answer

Steps of cellular respiration:

  1. Glycolysis: Glycolysis is the first step in cellular respiration. During glycolysis glucose undergoes partial oxidation and makes pyruvic acid. From 1 molecule of glucose 2 molecules of pyruvic acid is formed.

  2. Fermentation: The pyruvic acid undergoes fermentation in anaerobic conditions. There can be lactic acid fermentation or ethanol fermentation. By lactic acid fermentation pyruvic acid is converted into lactic acid, while in another case the pyruvic acid is converted to ethyl alcohol. Fermentation does not ensure complete oxidation of glucose.

  3. Citric Acid Cycle: Under aerobic conditions the pyruvic acid undergoes citric acid cycle. This converts the pyruvic acid into citric acid. ATP is also released which is stored by mitochondria.

$\text{Pyruvic Acid}+ \text{CoA}+\text{NAD}^+\xrightarrow{\ \ \ \ \text{Mg}^{2+}\ \ \ }\text{ Acety}\text{ CoA}+ \text{NADH}+\text{H}^+$

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