CBSE Board 2015 Microbiology Practice Questions

1. Which antibiotic was extensively used to treat American soldiers wounded in World War II?
2. Name two growth regulators commonly used in plant tissue culture.
3. Give the scientific name of the plant from which cocaine is obtained.
4. Write down the following terms in expanded form
(i) ELISA (ii) MALT
5. Give one example each of exotic breed of cattle and exotic breed of fowl.
6. How does colostrum provide initial protection against diseases to new born infants?
7. Differentiate between the two different varieties of sugarcane i.e., Saccharum barberi and Saccharum officinarum.
8. Why is the excreta (dung) of cattle rich in bacteria?
9. What do you understand by MOET? How is it useful in cattle improvement?
OR
What is meant by the term “inbreeding”? Write its disadvantages.
10. Riya, a 10 years old girl suffers from a bacterial disease.
She has rose coloured spots on her chest. She also suffers from adominal pain, light fever, low pulse rate and diarrhoea.
(i) From which disease does she suffer? Name the pathogen that infected her.
(ii) Which diagnostic test is used for its confirmation?
11. Draw a labelled diagram of a biogas plant, and explain its structure. How is biogas produced in the biogas plant?
12. Name the source of cyclosporin – A and streptokinase. Explain their importance in medical science.
13. (i) A farmer adds Azotobacter culture to the soil before sowing maize. How will it increase the yield of maize?
(ii) Explain the role of Lactobacillus in preparation of household products.
14. (i) Define the term ‘health’. When is “World Health Day” celebrated?
(ii) Describe the factors which affect our health.
15. What are baculoviruses? Why are they preferred as biological control agents?
16. What is mutation breeding? Explain its advantages over conventional methods of plant breeding?
17. What is biofortification? State its main objectives.
18. (i) How do plants develop insect resistance?
(ii) Name the resistant varieties of Brassica and flat bean and the related insect pests.
19. (i) Everyday humans are exposed to a large number of infectious agents in the environment, but only a few of these exposures result in disease. What is the reason for this?
(ii) Explain the different barriers of innate immunity.
20. (i) What will happen when a protoplast of tomato is fused with the protoplast of potato?
(ii) What is the role of micropropagation and somadones in improvement of crops?
OR
Mili owns a dairy farm. In order to improve the quality and quantity of milk production, what measures should be taken by her?
21.Jane had gone to her grandparents home where she visited a park near by. Suddenly she showed strong unusual hypersensitive response like sneezing, running nose and watery eyes.
(i) What could be the possible reason for it?
(ii) What should be done to reduce the symptoms in Jane?
22. (i) Draw a well-labelled diagram of an antibody molecule.
(ii) Which type of antibody is produced during allergic reaction?
23. John, 14 years old teenager is good in academics. However, there are few boys in his class who go to pubs for late night parties, consume alcohol and also take drugs. From the last few days, John’s mother noticed his drop in academic performance, lack of interest in personal hygiene, aggressive and rebellious behaviour, his loss of interest in hobbies, and changed sleeping and eating habits.
(i) What do you think may be the possible reason for this attitude?
(ii) What are the different measures that should be taken by parents to protect their children from substance abuse?
24. (i) Define apiculture and mention any two economically important products or humans which are obtained from honey bees.
(ii) Which points should be kept in mind for successful bee keeping?
(iii) Name two common species of honey bee, which are used in apiculture.
OR
(i) What is plant breeding?
(ii) Describe the major steps required for developing varieties of crops.
25. (i) How can microbes be useful in production of beverages?
(ii) Name a green manure crop? How does it help in increasing fertility of soil?
OR
(i) Differentiate between primary sludge and activated sludge.
(ii) Three water samples were subjected to BOD test. The samples were labelled as A, B and C. The BOD values of the three samples. A, B and C were recorded as 20mg/L, 8mg/L and 400 mg/L, respectively. Which sample of the water is most polluted?
26. (i) Bob, a cab driver is in the habit of chewing tobacco throughout the day. Since a few days, he has not been able to eat his food, as there are many ulcers in his mouth, and he is also suffering from high blood pressure. What may be the possible reason for this?
(ii) How does morphine, an opioid drug affect the human body?
OR
(i) What happens to a normal cell in a body when oncogenes the activated under certain conditions?
(ii) Which techniques are useful to detect cancer of internal organs?
(iii) Why are cancer patients often given a-interferon during their treatment?

Answers 

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