|1 Crore+ students have signed up on EduRev. Have you?|
Q.1. What causes malaria?
Q.2. What are preservatives?
Q.3. Name the microorganisms which can fix atmospheric nitrogen in the soil.
Q.4. Give two examples of algae.
Q.5. How can we prevent the spread of communicable diseases?
Q.6. What are the harmful effects of microorganisms on plants?
Q.7. Who discovered penicillin?
Q.8. How are jams and squashes preserved?
Q.9. How can food be preserved by adding oil and vinegar?
Q.10. What causes foot and mouth disease of cattle?
Q.11. What diseases are prevented through vaccination?
Q.12. How does common cold spread?
Q.13. How are meat and fish preserved?
Q.14. Why dry fruits and even vegetables are sold in sealed air tight packets?
Q.15. What are biological nitrogen fixers?