Question 14

Anaerobic respiration is responsible for the recorded production of CO2 by yeast cells from sugar solution.

Yeast cells produce carbon dioxide (CO2) through the process of anaerobic respiration when they metabolize sugars in the absence of oxygen. This process leads to fermentation, where sugar is converted into alcohol and CO2.

A) Capillary action

Capillary action refers to the movement of liquids through narrow spaces, which is not relevant to the metabolic processes of yeast. This option does not involve the production of CO2 and is therefore incorrect.

B) Translocation

Translocation is the movement of nutrients and water within a plant, primarily through the phloem. It is unrelated to yeast metabolism and has no role in the production of CO2, making this option incorrect.

C) Photosynthesis

Photosynthesis is the process by which plants convert light energy into chemical energy, producing oxygen and glucose. Yeast, however, does not perform photosynthesis but rather ferments sugars to produce CO2, rendering this option incorrect.

D) Anaerobic respiration

Anaerobic respiration is the correct process as it occurs in yeast cells when they break down sugar in the absence of oxygen, resulting in the production of carbon dioxide and ethanol. This is the primary pathway through which yeast generates CO2 from sugar solutions.

Conclusion

Anaerobic respiration is the definitive process responsible for CO2 production in yeast, as it directly involves the fermentation of sugars. Other options like capillary action, translocation, and photosynthesis do not pertain to yeast metabolism or the specific context of CO2 production from sugar solutions, thus solidifying D as the correct answer.