Question

write two harmful and useful activities of bacteria

Answer 1

Harmful Activities:

Some bacteria are harm­ful to human affairs in different ways:

a. Pathogenic Bacteria:

These bacteria cause great losses to plant and animal popula­tion by causing several diseases. Some important bacterial diseases of plants and animals, including human beings is given below (Table 2.6-2.8 and 2.11).

b. Reduction of Soil Fertility

Answer 2

Two harmful activities of bacteria are :

1. Some bacteria can cause food poisoning.

2. There are bacteria who reduce the soil productivity.

Two useful activities of bacteria are :

1. Bacteria help in decomposing the sewage and the garbages and act as scavangars .

2. Many bacteria help in increasing soil fertility.