Question

Read the following statements:

(i) The maximum concentration of alcohol in beverages that are naturally fermented is less than 3%
(ii) Yeasts poison themselves to death when the concentration of alcohol reaches about $13\%$.
(iii) In both lactic acid and alcoholic fermentation not much energy is released, less than $7\%$ of the energy in glucose is released and not all of it is trapped as high energy bonds of ATP.
(iv) The ratio of ATP formed in aerobic and anaerobic respiration is $18:1$.
(v) During aerobic respiration, complete oxidation of respiratory substrate releases energy, $C{O}_2$ but not water.

How many of the above statements are correct?

• A. Five
• B. Four
• C. Three
• D. Two

Answer 1

Answer: (C)

Three

Statements (i) and (v) are incorrect, while rest are correct.

Maximum concentration of alcohol in naturally fermented beverages is 15-16%.

During aerobic respiration, complete oxidation of respiratory substrate releases energy, CO${}_2$ and water.

So, the correct option is 'Three'.