Question

(1) Give the name of two free living bacteria.
(2) What is the normal percentage of N2 in air?
(3) Write the full name of DDT.
(4) Write the full name of BOD.
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Answer 1

Answer:

1. Give the name of two free living bacteria.

Ans. Azotobacter and Clostridium.

2. What is the normal percentage of N₂ in air?

Ans. Atmosphere contains about 77.17% of N₂

3. Write the full name of DDT.

Ans. Dichloro Diphenyl Trichloro ethane.

4. Write the full name of BOD.

Ans. Biological Oxygen Demand.