Correct Option
The correct option isWater
Explanation
Respiration is the catabolic process by which living organisms break down glucose to release energy. Depending on the availability of oxygen, respiration is classified into aerobic (presence of oxygen) and anaerobic (absence of oxygen).
Option Analysis
- Alcohol is incorrect: Alcohol (specifically ethanol) is a product of anaerobic respiration (fermentation) in yeast cells. In this process, glucose is incompletely broken down into ethanol, carbon dioxide, and energy.
- Lactic acid is incorrect: Lactic acid is produced during anaerobic respiration in animal muscle cells. This occurs when there is a lack of oxygen during intense physical activity.
- Water is correct: Aerobic respiration involves the complete oxidation of glucose in the presence of oxygen. This process occurs in the mitochondria and results in the formation of Carbon dioxide ($CO_2$), Water ($H_2O$), and a large amount of Energy (ATP). The chemical equation is:
$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + Energy$ - Glucose is incorrect: Glucose is the substrate (reactant) that is broken down during the process of respiration; it is not a product.
Key Takeaway
Aerobic respiration completely breaks down glucose using oxygen to produce Carbon dioxide, Water, and Energy (ATP), whereas anaerobic respiration yields byproducts like alcohol or lactic acid.