Discussion
Which of the following products are obtained by anaerobic respiration in plants ?
1. Lactic acid
2. Carbon dioxide
3. Water
4. Ethanol
Choose the correct option :
Answer: B
The products are carbon dioxide and ethanol (2 and 4 only).
In plants and in yeast, anaerobic respiration (fermentation) breaks glucose down without oxygen into ethanol and carbon dioxide, releasing a little energy:
\[ \begin{aligned} &\mathrm{C_{6}H_{12}O_{6}} \\ &\mathrm{\rightarrow 2C_{2}H_{5}OH + 2CO_{2}} \end{aligned} \]
Lactic acid is the product of anaerobic respiration in animal muscle, and water is produced only in aerobic respiration, when oxygen is the final electron acceptor. That rules out options containing 1 or 3.
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