Microbes in Human Welfare

NEET Biology · 80 questions · Page 6 of 8 · Click an option or "Show Solution" to reveal answer

Q51

A drug used for organ-transplant patients is obtained from a species of the organism:

A Trichoderma

B Pseudomonas

C Monascus

D Penicillium

Correct Answer

Option A

Solution

Cyclosporin A is an immunosuppressive drug obtained from Trichoderma and used in organ transplantation.

Q52

An organism used as a biofertilizer for raising soyabean crop is:

A Azotobacter

B Azospirillum

C Nostoc

D Rhizobium

Correct Answer

Option D

Solution

Rhizobium japonicum forms symbiotic association in the roots of the leguminous plant soybean.

Q53

Ethanol is commercially produced through a particular species of:

A Clostridium

B Trichoderma

C Aspergillus

D Saccharomyces

Correct Answer

Option D

Solution

Ethanol is commercially produced through Saccharomyces cerevisiae.

Q54

Continuous addition of sugars in fed batch fermentation is done to:

A obtain antibiotics

B produce methane

C purify enzymes

D degrade sewage

Correct Answer

Option A

Solution

Continuous addition of sugars in fed-batch fermentation is done to obtain high yields of desired products like antibiotics.

Q55

Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?

A Propane

B Mustard gas

C Marsh gas

D Laughing gas

Correct Answer

Option C

Solution

Marsh gas is another term for methane, produced by anaerobic bacteria decomposing organic matter.

Q56

The most common substrate used in distilleries for the production of ethanol is:

A Ground gram

B Molasses

C Soyabean

D Corn meal

Correct Answer

Option B

Solution

Molasses are commonly used in distilleries for the production of ethanol.

Q57

Secondary sewage treatment is mainly a:

A Mechanical process

B Chemical process

C Biological process

D Physical process

Correct Answer

Option C

Solution

In secondary treatment, settled sewage flows to an aerobic biological treatment stage where microorganisms remove and oxidise most remaining organic pollutants.

Q58

Organisms called Methanogens are most abundant in a:

A Polluted stream

B Hot spring

C Cattle yard

D Sulphur rock

Correct Answer

Option C

Solution

Methanogens are archaebacteria, abundant in cattle yards and paddy fields.

Q59

Which one of the following is not a biofertilizer?

A Agrobacterium

B Nostoc

C Rhizobium

D Mycorrhiza

Correct Answer

Option A

Solution

Agrobacterium tumefaciens is a pathogen of several dicot plants causing gall tumour. It is not a biofertilizer.

Q60

An example of endomycorrhiza is:

A Nostoc

B Rhizobium

C Glomus

D Agaricus

Correct Answer

Option C

Solution

The genus Glomus forms endomycorrhiza. They absorb phosphorus from soil and pass it to the plant.

Ready for a full NEET mock test? Timed · full syllabus · instant results

Take a Mock Test →