Question

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Science
Q.1. What is vaccine? Describe the importance of vaccination.
Q.2. Explain various methods that can be used for food preservation.
Q.3. Describe nitrogen cycle in nature.
Q.4. Why are plastics considered a threat to our environment?
Q.5. Explain whether micro-organisms are our friends or foe.
Q.6. What is nitrogen fixation?
Q.7. What is the chemical nature of polyester?
Q.8. By which material artificial wool is formed? Why artificial wool has become more
popular than natural wool?
Q.9. Why is it advised not to wear synthetic clothes while working in a laboratory or
working with fire in the kitchen?
Q.10. Name any two thermoplastics and thermosetting plastics.
Q.11. What is polythene?
IQ.12. Why are thermoplastics not used for making frying pan handles?
Q.13. Complete Chapter-3 (Synthetic Fibres & Plastics) in Lab Manual.
Do above mentioned work in Science Practice Notebook and Lab Manua
respectively.
Social Science​

Answer 1

vaccine is a substance which is put in a blood which prevent body to fight against diseases. Vaccination is very important for our body to fight against diseases