Answer the following in short: [7*2=14] 1. What role does social machinery play in the field of hygiene?
2. Why is washing of hands before and after meal essential?
3. How can you control the spread of infectious diseases?
4. All living organisms adjust to change in the environment. Justify the statements with examples.
5. How do you aquatic plant protects their bodies from decay while living in water?
6. Write the importance of blood transfusion.
7. Why is blood group ‘O’ called the universal donor?
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