Question

1. Some yeast, sugar and water are mixed in a test-tube.The diagrams show the
test-tube at the start and after one hour.
Which process causes this change?
a. growth
b. reproduction
c. respiration
d. All of the above

Answer 1

Answer:

Explanation:

Explanation: In the tube containing sugar solution and yeast, aerobic respiration will take place. So the products would be carbon dioxide and water. The tube which has a oil cover on the sugar solution, doesn't have access to oxygen. So anaerobic respiration will take place. The respiration products will be carbon dioxide, lactic acid or ethanol.