| (i) Bacteria multiply quickly, thus producing a cheap and abundant source of enzymes. |
| (ii) Only one type of bacteria is required to provide the various enzymes necessary for different kinds of wastes. |
| (iii) Bacteria can break down waste under anaerobic or aerobic condition. |
A) (i) only
B) (i) and (iii) only
C) (ii) and (iii) only
D) (i), (ii) and (iii)
Correct Answer: B
Solution :
Bacteria have very short generation time, thus an abundant supply of bacteria can be obtained quickly. Also, the sewage treatment process involve different conditions, e.g., aerobic and anaerobic, at different steps. There are various kinds of bacteria that are adapted to various types of environments, thus it is easy to find suitable bacteria that can break down waste at various points along the process. Various kinds of enzymes are usually required to breakdown different substrates and these enzymes come from different bacteria.
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