1. How do microorganisms help the environment, according to the text?

2. What does the word ‘Krimi’ in ancient Indian texts refer to?

3. Why is manure formation important for plants?

4. What can we infer from Activity 2.7 about microorganisms?

5. Which gas is primarily produced by microorganisms during the decomposition of plant and animal waste in an oxygen-free environment?

6. What is biogas mainly composed of?

7. What is the main use of biogas produced by microorganisms?

8. Who developed a special bacterium that could break down oil spills in 1971?

9. What is a patent?

10. Why was Ananda Mohan Chakrabarty’s work important for the environment?