11. | Pasteur is famous for – |
A. for protein synthesis | |
B. for the discovery of the microscope | |
C. For germ theory of diseases | |
D. for fermentation of wine |
12. | The smallest animal among the following is – |
A. Virus | |
B. bacteria | |
C. mycoplasma | |
D. yeast |
13. | The bacteria which directly convert atmospheric nitrogen into nitrogenous compounds are called – |
A. denitrifying bacteria | |
B. putrefaction bacteria | |
C. nitrogen fixing bacteria | |
D. nitrifying bacteria |
14. | Root nodules are found in – |
A. In some leguminous plants and in some other plants | |
B. only in some leguminous plants | |
C. in all leguminous plants but never in other plants | |
D. in all plants |
15. | Bacteria cannot survive in high salt pickle because |
A. These protoplasms shrivel up and thus die | |
B. Pickles do not contain nutrients necessary for the survival of bacteria. | |
C. salt inhibits reproduction | |
D. bacteria do not get enough light to reproduce |
16. | The bacteria found in human intestine is |
A. corinii bacterium | |
B. escherichia coli | |
C. vibrio caulei | |
D. bacillus anthracis |
17. | The bacterium that causes tuberculosis (TB) is – |
A. salmonella | |
B. mycobacterium | |
C. diplococcus | |
D. Streptomyces |
18. | Food poisoning is caused by – |
A. by Clostridium titanii | |
B. by Clostridium botulinum | |
C. by salmonella typholis | |
D. by Bacillus anthracis |
19. | Antibiotics are mostly obtained from – |
A. from fungi | |
B. from viruses | |
C. from bacteria | |
D. from angiosperms |
20. | If one bacterial cell divides every 20 minutes, how many bacteria will be formed in two hours? |
A. 4 | |
B. 16 | |
C. 8 | |
D. 64 |