Microbes In Human Welfare

Biology
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By all of the following ways, bacteria can become resistant to the antibiotic, except - 

A
Making enzymes that inactivate the drug.
B
Becoming impermeable to the drug.
C
Modifying the target of the drug.
D
Moving away from the drug.
Medium
AIIMS
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Cultivation of Bt cotton has been much in the news. The prefix "Bt" means

A
"Barium-treated" cotton seeds
B
"Bigger thread" variety of cotton with better tensile strength
C
Produced by "biotechnology" using restriction enzymes and ligases
D
Carrying an endotoxin gene from Bacillus thuringiensis
Medium
AIIMS
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Which one of the following is a matching pair of a drug and its category?

A
Amphetamines - Stimulant
B
Lysergic acid diethylamide - Analgesic
C
Benzodiazepam - Pain killer
D
None of the abve
Hard
AIIMS
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Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by 

A
Storing them in underground storage tanks
B
Using them for producing biogas
C
Vermiculture
D
Using them directly as biofertilizers
Medium
AIIMS
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Select the correct statement.

A
Acetobacter aceti produces citric acid.
B
Saccharomyces cerevisiae is used as clot buster.
C
Penicillium notatum restrict the growth of Staphylococci.
D
Methanogens are found in aerobic conditions.
Hard
AIIMS
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Assertion

Use of fertilizers greatly enhances crop productivity.

Reason

Irrigation is very important in increasing crop productivity.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C
Assertion is correct but Reason is incorrect.
D
Both Assertion and Reason are incorrect.
Hard
AIIMS
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Azolla is used as a biofertilizer, because it

A
Multiplies very fast to produce massive biomass
B
Has association of nitrogen-fixing Rhizobium
C
Has association of nitrogen-fixing Cyanobacteria
D
Has association of Mycorrhiza
Medium
AIIMS
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Which of the following antibiotics is not correctly matched with the source from which it is obtained?

A
Penicillin - Penicillium chrysogenum
B
Bacitracin - Bacillus licheniformis
C
Griseofulvin - Penicillium griseofulvum
D
Streptomycin - Bacillus griseus
Medium
AIIMS
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Which one of the following is regarded as a biofertilizer?

A
An association between pteridophytes and cyanobacteria Anabaena
B
An association between gymnosperms and Nostoc
C
An association between legume and Rhizobium
D
All of the above
Hard
AIIMS
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