Microbes in Human Welfare

NEET Biology · 80 questions · Page 4 of 8 · Click an option or "Show Solution" to reveal answer

Q31

An example of endomycorrhiza is -

A Nostoc

B Rhizobium

C Glomus

D Agaricus

Correct Answer

Option C

Solution

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

Q32

The common nitrogen-fixer in paddy fields is -

A Azospirillum

B Frankia

C Rhizobium

D Oscillatoria

Correct Answer

Option A

Solution

Azospirillum is an anaerobic nitrogen fixing bacteria which forms loose association with roots of some plants.

Inoculation of paddy fields with these bacteria helps in increasing yield.

Q33

A common biocontrol agent for the control of plant diseases is -

A Bacillus thuringiensis

B Trichoderma

C Glomus

D Baculovirus

Correct Answer

Option B

Solution

Free living fungus Trichoderma exerts biocontrol over several plant pathogens for the control of plant diseases.

Q34

Match the list of microbes and their importance - Saccharomyces cerevisiae, Monascus purpureus, Trichoderma polysporum, Propionibacterium sharmanii

A (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

B (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

C (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

D (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

Correct Answer

Option B

Solution

Saccharomyces - ethanol.

Monascus purpureus - blood cholesterol lowering agents.

Trichoderma polysporum - immunosuppressive agent.

Propionibacterium sharmanii - ripening of Swiss cheese.

Q35

The guts of cow and buffalo possess

A Cyanobacteria

B Fucus sp

C Methanogens

D Chlorella sp

Correct Answer

Option C

Solution

Methanogens (microorganisms producing methane) are found in the guts of ruminant animals e.g. cows and buffaloes.

Q36

What gases are produced in anaerobic sludge digesters?

A Methane and CO2 only

B Methane, Hydrogen Sulphide and O2

C Methane, Hydrogen Sulphide and CO2

D Hydrogen Sulphide and CO2

Correct Answer

Option C

Solution

Anaerobic digestion produces biogas consisting of methane, carbon dioxide and traces of other contaminant gases.

Q37

Which one of the following fungi contains hallucinogens?

A Morechella esculenta

B Neurospora sp.

C Amanita muscaria

D Ustilago sp.

Correct Answer

Option C

Solution

Several mushrooms such as Amanita muscaria secrete hallucinogenic substances like psilocybin and psilocin.

Q38

An alga which can be employed as food for human being is :

A Polysiphonia

B Chlorella

C Ulothrix

D Spirogyra

Correct Answer

Option B

Solution

Chlorella is a single celled chlorophycean alga with rich protein content.

It is considered as a source of SCP (single cell protein).

Q39

Microbe used for biocontrol of pest butterfly caterpillars is :

A Streptococcus sp

B Trichoderma sp.

C Saccharomyces cerevisiae

D Bacillus thuringiensis

Correct Answer

Option D

Solution

Bacillus thuringiensis is sprayed onto vulnerable plants where it is eaten by insect larvae.

In the gut of the larvae, the toxin is released and the larvae get killed.

Q40

A good producer of citric acid is

A Clostridium

B Saccharomyces

C Aspergillus

D Pseudomonas

Correct Answer

Option C

Solution

A good source of citric acid is Aspergillus niger (a fungus).

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

Take a Mock Test →