Q. Which of the following is/are true for yeast :
  1. They are single-celled organisms.
  2. They respire aerobically and during this process yield alcohol.
Select the correct answer from the codes given below:

Answer: Only 1
Notes: Yeasts are single-celled organisms. They respire anaerobically and during this process yield alcohol. They are, therefore, used to make wine and beer.