THESE ARE SOME HEAVY DUTY QUESTIONS FROM CLASS 8th BIOLOGY BOOK Please help me in my homework. You cant Google This.
1. How do vaccines works in our body? (AS1) 2. What are the differences between Antibiotic and Vaccine? (AS1) 3. Invention of pencilline protected the world from deaths during first world war, explain.(AS 1) 4. Take three bowls and mark as A, B, C. Pour lukewarm milk in bowl A, hot milk in bowl B, cold milk in bowl C. Add one tea spoon of curd or butter milk in three bowls and stir them slightly. Cover the bowls with lids. Keep the bowls undisturbed for five to six hours. In which bowl milk turned into curd? Give your reasons. (AS 3) • Some microorganisms are useful and some microorganisms are harmful. • Microbes are useful in home, industry cleaning the environment. • Soil microbes degrade organic wastes into useful nutrients. This helps plants in their growth and development. • Some microorganisms cause diseases in humans, plants, and other animals. • Some insects and animals act as vectors of microbes. • Some microbes release toxins in improperly preserved food, which causes food poisoning. • Pasteurisation helps in milk preservation. • The bacterium 'rhizobium' present in root nodules of leguminous plants fixes atmospheric Nitrogen. SCERT TELANGANA 5. Collect more information about scientists who invented and discovered other facts related to Microorganisms. How these discoveries helped mankind? Make a chart presentation and paste it on your classroom wall Magazine.(AS 4) 6. Make an Album of scientists and their discoveries related to Microorganisms.(AS 4) 7. Visit the veterinary hospital and prepare a list of cattle, Goat, Sheep diseases by asking questions to the doctor? (AS4) 8. What is pasteurisation ? How is it useful? (AS 6) 9. Edward Jenner's collects fluid from cow pox pustule and injects to a eight year old boy. Then he exposed the boy to smallpox and the boy did not get smallpox. How do you appreciate the daring action of Edward Jenner? (AS 6) 10. Visit a nearby milk chilling centre/a librarey . Observe the process and make a report on it. (40) 11. ''Prevention is better than cure'' comment. (AS 6) 12. Raheem tells to his neighbours, "stagnation of sewage in our surroundings is harmful to our health." Do you support this? Why?(AS 6) 13. Jeevan said that "If there are no micro organisms earth will remain with wastes" will you agree with this statement, why? (AS 6) 14. kavita is suffering from serious illness. Doctor priscribed antibiotics for five days. After three days of usage she stopped taking antibiotics. Is it correct or not, discuss. (AS 6) 15. What are the precautions taken to eradicate malaria? (AS 7) 16. One medical store owner is giving antibiotics to his customer who is suffering from fever without a doctor’s prescription? But the customer's daughter Malathi is telling her father not to take antibiotics without doctor’s prescription. Whom do you support and why? (AS 7)
Answers
Answer:
1.Vaccines help develop immunity by imitating an infection. This type of infection, however, almost never causes illness, but it does cause the immune system to produce T-lymphocytes and antibodies. Sometimes, after getting a vaccine, the imitation infection can cause minor symptoms, such as fever.
2.Antibiotics and vaccines are in some ways opposites. Antibiotics kill indiscriminately, whereas vaccines are highly targeted. Antibiotics are used to treat severe infection, whereas vaccines prevent infections from ever becoming established.
3. it was extracted by Sir Alexander Flemming. but was brought in full use by Ernest Chain and Howard Florey during world war 1. ✔️in a war people get injured seriously and are more often likely to die due to microbial infection in wounds. penicillin stops microbial growth and prevents people from dying.
3.. Out of the three bowls A B C, bowl A with lukewarm milk will turn into milk. The reason for the lukewarm setting the milk is that it contains lectobesilus bacteria. These bacteria helps to change the milk into curd. the bowl B with hot milj kill the bacterias and so will the bowl C.
3.. Types of Microorganisms are bacteria, archaea, fungi, protozoa, algae, and viruses. Harmful Microorganisms examples: Escherichia coli O157:H7, Mycobacterium tuberculosis, Streptococcus mutans, Salmonella enteric and Chlamydophila pneumonia. Useful Microorganisms include: Saccharomyces cerevisiae, Aspergillus oryzae,
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