Pasteur's effect is

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(C) Pasteur's effect is the inhibition of the process of fermentation by oxygen. When oxygen is introduced to an anaerobic culture of yeast,the rate o

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Decrease in fermentation in the presence of oxygen

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(C) Pasteur's effect is the inhibition of the process of fermentation by oxygen. When oxygen is introduced to an anaerobic culture of yeast,the rate of glucose consumption decreases significantly because the organism switches from fermentation (which is less efficient) to aerobic respiration (which is more efficient for $ATP$ production). Thus,the presence of oxygen suppresses the fermentation process.

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