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Consider the following statements about microbes and medicines:
1. Viruses reproduce only inside the cells of a host.
2. Penicillin kills bacteria by blocking the process by which they make their cell-wall.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Scientist) | List-II (Contribution) |
|---|---|
| A. Louis Pasteur | 1. Discovered the bacterium of anthrax |
| B. Edward Jenner | 2. Discovered fermentation |
| C. Alexander Fleming | 3. Penicillin prepared from a mould he observed |
| D. Robert Koch | 4. Vaccine for smallpox |
Select the correct answer using the codes given below.
Match List-I with List-II:
| List-I (Disease) | List-II (Causal microbe) |
|---|---|
| A. Citrus canker | 1. Virus |
| B. Rust of wheat | 2. Protozoa |
| C. Yellow vein mosaic of bhindi | 3. Bacteria |
| D. Kala-azar | 4. Fungi |
Select the correct answer using the codes given below.
Consider the following statements about food preservation:
1. Jams, jellies and squashes are preserved with sugar because sugar reduces moisture.
2. In pasteurisation, milk is heated and then cooled slowly so that microbes do not grow.
3. Sodium metabisulphite is a common chemical preservative.
Which of the statements given above is/are correct?
Consider the following statements:
1. Rhizobium lives in the root nodules of leguminous plants and fixes atmospheric nitrogen in a symbiotic relationship.
2. Some blue-green algae also fix nitrogen in the soil.
3. Microbes decompose polythene and plastic into manure.
Which of the statements given above is/are correct?
Consider the following statements about types of diseases:
1. Asthma and the infection causing elephantiasis are examples of acute diseases.
2. High blood pressure caused by excess weight and lack of exercise is a non-infectious disease.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Disease) | List-II (Mode of spread) |
|---|---|
| A. Malaria | 1. Sexual contact |
| B. Dengue | 2. Female Aedes mosquito |
| C. Cholera | 3. Contaminated drinking water |
| D. AIDS | 4. Female Anopheles mosquito |
Select the correct answer using the codes given below.
Consider the following statements about useful microbes:
1. Yeast is a bacterium whose carbon dioxide makes dough rise.
2. Alcohol, wine and vinegar are produced on a large scale with the help of microbes.
3. Bacteria are used in making cheese and pickles.
Which of the statements given above is/are correct?
Match List-I with List-II.
| List-I (Disease) | List-II (Causal microbe group) |
|---|---|
| A. Foot and mouth disease of cattle | 1. Bacteria |
| B. Anthrax | 2. Protozoa |
| C. Many skin infections | 3. Virus |
| D. Malaria | 4. Fungi |
Select the correct answer using the codes given below.
Consider the following statements about how diseases spread:
1. Syphilis spreads through sexual contact.
2. The housefly can contaminate food.
3. Syphilis spreads through casual contact such as shaking hands or playing together.
Which of the statements given above is/are correct?
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