M.C.Q (1 Marks)

MCQ 11 Mark

In cheese microorganisms are required for:

A
Ripening only.
B
Souring of milk only.
✓
Souring and ripening.
D
Development of resistance to spoilage.

Answer

Correct option: C.

Souring and ripening.

c.Souring and ripening.

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MCQ 21 Mark

The bacterium that commonly lives in animal and human intestine is:

A
Bacillus anthracis.
B
Vibrio cholerae.
✓
Escherichia coli.
D
Corynebacterium.

Answer

Correct option: C.

Escherichia coli.

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MCQ 31 Mark

Match the items in Column $'A\ ’$ and Column $'B\ ’$ and choose correct answer.

	Column $A$		Column $B$
$i.$	Lady bird	$a.$	Methano bacterium
$ii.$	Mycorrhiza	$b.$	Trichoderma
$iii.$	Biological control	$c.$	Aphids
$iv.$	Biogas	$d.$	Glomus

The correct answer is:

A
$\text{i -b, ii -d, iii -c, iv -a.}$
✓
$\text{i -c, ii -d, iii -b, iv -a.}$
C
$\text{i -d, ii -a, iii -b, iv -c.}$
D
$\text{i -c, ii -b, iii -a, iv -d.}$

Answer

Correct option: B.

$\text{i -c, ii -d, iii -b, iv -a.}$

	Column $A$		Column $B$
$i.$	Lady bird	$c.$	Aphids
$ii.$	Mycorrhiza	$d.$	Glomus
$iii.$	Biological control	$b.$	Trichoderma
$iv.$	Biogas	$a.$	Methano bacterium

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MCQ 41 Mark

What would happen if oxygen availability to activated sludge flocs is reduced?

✓
The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs
B
Flocs would increase in size as anaerobic bacteria would grow around flocs
C
Protozoa would grow in large numbers
D
It will slow down the rate of degradation of organic matter

Answer

Correct option: A.

The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs

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MCQ 51 Mark

Trichoderma harzianum has proved a useful microorganism for:

A
Gene transfer in higher plants
✓
Biological control of soil$-$borne plant pathogens
C
Bioremediation of contaminated soils
D
Reclamation of wastelands

Answer

Correct option: B.

Biological control of soil$-$borne plant pathogens

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MCQ 61 Mark

Which of the following bacteria is associated with the production of bioinsecticide?

A
Bacillus subtilis
✓
Bacillus thuringiensis
C
Agrobacterium
D
Azotobacter

Answer

Correct option: B.

Bacillus thuringiensis

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MCQ 71 Mark

Which gas is responsible for the puffed$-$up appearance of dough?

✓
$CO_2$
B
$O_2$
C
$SO_2$
D
$NO_2$

Answer

Correct option: A.

$CO_2$

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MCQ 81 Mark

Which among the following exhibits competitive inhibition?

✓
Statin.
B
Cyclosporin.
C
Penicillin.
D
Yeast.

Answer

Correct option: A.

Statin.

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MCQ 91 Mark

Which of the following bacteria converts milk into curd?

A
Propionibacterium.
✓
Lactobacillus.
C
Streptococcus.
D
Bacillus.

Answer

Correct option: B.

Lactobacillus.

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MCQ 101 Mark

In $\text{rDNA}$ technology, Hepatitis $B$ vaccine is produced from:

✓
Yeast.
B
Bacillus.
C
$E.$ coli.
D
Streptaescores.

Answer

Correct option: A.

Yeast.

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MCQ 111 Mark

The guts of cow and buffalo possess:

A
Chlorella spp
✓
Methanogens
C
Cyanobacteria
D
Fucus spp.

Answer

Correct option: B.

Methanogens

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MCQ 121 Mark

The technology of biogas production from cow dung was developed in India largely due to the efforts of:

A
Gas Authority of India.
B
Oil and Natural Gas Commission.
✓
Indian Agricultural Research Institute and Khadi $\&$ Village Industries Commission.
D
Indian Oil Corporation.

Answer

Correct option: C.

Indian Agricultural Research Institute and Khadi $\&$ Village Industries Commission.

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MCQ 131 Mark

Which among the following is not included under cyanobacteria?

A
Anabaena.
B
Nostoc.
C
Oscillatoria.
✓
Rhizobium.

Answer

Correct option: D.

Rhizobium.

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MCQ 141 Mark

Which of the following nitrogen$-$fixing bacteria is present in root nodules of leguminous plants?

✓
Rhizobium
B
Salmonella
C
Lactobacillus
D
Acetobacter

Answer

Correct option: A.

Rhizobium

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MCQ 151 Mark

They help in increasing soil fertility:

A
Pseudomonas and cereals
B
Bacillus and Penicillium
✓
Salvinia and Marsilea
D
Nostoc and legumes

Answer

Correct option: C.

Salvinia and Marsilea

Nostoc and legumes help in increasing soil fertility by nitrogen fixation in the soil.

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MCQ 161 Mark

Which bacteria was used as biopesticide, for the first time on the commercial scale in the world?

✓
Bacillus thuringiensis
B
Escherichia coli
C
Pseudomonas aeruginosa
D
Agrobacterium tumefaciens

Answer

Correct option: A.

Bacillus thuringiensis

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MCQ 171 Mark

Fertilizers applied to crop plants, pollute:

A
Soil resources.
B
Water resources.
C
Atmosphere.
✓
Both $A$ and $B.$

Answer

Correct option: D.

Both $A$ and $B.$

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MCQ 181 Mark

Dosa and Idli are preparations of:

A
Wheat flour
B
Rice
✓
Rice and Black gram
D
Wheat and Black Gram

Answer

Correct option: C.

Rice and Black gram

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MCQ 191 Mark

Pasteurisation is a process that is undertaken to:

✓
Make milk tastier
B
Kill the pathogenic microbes
C
Make beverages
D
All of the above

Answer

Correct option: A.

Make milk tastier

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MCQ 201 Mark

What gases are produced in anaerobic sludge digesters?

A
Methane and $CO_2$ only
✓
Methane, hydrogen sulphide and $CO_2$
C
Methane, hydrogen sulphide and $O_2$
D
Hydrogen sulphide and $CO_2$

Answer

Correct option: B.

Methane, hydrogen sulphide and $CO_2$

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MCQ 211 Mark

High biological oxygen demand in a water body means?

✓
Water is polluted
B
Water is not polluted
C
Waterbody contains lots of lifeforms
D
None of these

Answer

Correct option: A.

Water is polluted

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MCQ 221 Mark

Two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Intercropping checks the population of insects.
Reason: Plant pests can be controlled biologically by their natural parasites and pathogens.

A
Both assertion and reason are true and reason is the correct explanation of assertion.
✓
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
D
Both assertion and reason are false.

Answer

Correct option: B.

Both assertion and reason are true but reason is not the correct explanation of assertion.

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MCQ 231 Mark

What will happen if a wheat field is inoculated with bacterium Rhizobium?

A
The soil will become rich in calcium.
B
The soil will become rich in nitrogen.
✓
There will be no effect on soil nitrogen.
D
The soil will be rich in $O_2$.

Answer

Correct option: C.

There will be no effect on soil nitrogen.

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MCQ 241 Mark

fern commonly inoculated to paddy fields is:

✓
Azolla
B
Marsilea
C
Salvinia
D
Anabaena

Answer

Correct option: A.

Azolla

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MCQ 251 Mark

Activated sludge should have the ability to settle quickly so that it can:

✓
Be rapidly pumped back from sedimentation tank to aeration tank.
B
Absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tank.
C
Be discarded and anaerobically digested.
D
Absorb colloidal organic matter.

Answer

Correct option: A.

Be rapidly pumped back from sedimentation tank to aeration tank.

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MCQ 261 Mark

The plant pesticide pyrethrum is obtained from:

A
Cinchona officinalis
✓
Chrysanthemum cinerariifolium
C
Chrysophyllum cainito
D
Cannabis sativa

Answer

Correct option: B.

Chrysanthemum cinerariifolium

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MCQ 271 Mark

Methanogens do not produce:

✓
Oxygen.
B
Methane.
C
Hydrogen sulfide.
D
Carbon dioxide.

Answer

Correct option: A.

Oxygen.

Methanogens produce methane, carbon dioxide and hydrogen sulphide.

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MCQ 281 Mark

Select the correct statement from the following:

✓
Activated sludge sediment is dettlement tanks of sewage treatment plant is rich source of aerobic bacteria.
B
Biogas is produced by the activity of aerobic bacteria on animal waste.
C
Biogas commnly called gobar gas in pure methane.
D
None of these.

Answer

Correct option: A.

Activated sludge sediment is dettlement tanks of sewage treatment plant is rich source of aerobic bacteria.

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MCQ 291 Mark

$\text{BOD}$ of waste water is estimated by measuring the amount of:

✓
oxygen consumption
B
oxygen evolution
C
biodegradable organic matter
D
total organic matter

Answer

Correct option: A.

oxygen consumption

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MCQ 301 Mark

Which one is a biofertilizer?

✓
$\text{VAM}$
B
Sporeine
C
Devine
D
Agent Orange

Answer

Correct option: A.

$\text{VAM}$

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MCQ 311 Mark

Thurioside is a proteinaceous toxin, which is obtained from:

A
Biofertilizer
B
Farmyard manure
C
Green manure
✓
Bacteria

Answer

Correct option: D.

Bacteria

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MCQ 321 Mark

The product of which has been commercialised for lowering blood cholesterol:

A
Trichoderma polysperma
✓
Monascus purpureus
C
Saccharomyces cerevisiae
D
Aspergillus niger

Answer

Correct option: B.

Monascus purpureus

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MCQ 331 Mark

Acellular microorganism is:

A
Bacteria
✓
Virus
C
Protozoa
D
None of the above

Answer

Correct option: B.

Virus

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MCQ 341 Mark

Microbe used for biocontrol of pest butterfly caterpillars is?

✓
Bacillus thuringiensis
B
Streptococcus species
C
Trichoderma species
D
Saccharomyces cerevisiae

Answer

Correct option: A.

Bacillus thuringiensis

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MCQ 351 Mark

Two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Enzymes application in industry is enhanced by its immobilisation.
Reason: Immobilisation provides protection to enzymes without affecting their activity.

✓
Both assertion and reason are true and reason is the correct explanation of assertion.
B
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
D
Both assertion and reason are false.

Answer

Correct option: A.

Both assertion and reason are true and reason is the correct explanation of assertion.

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MCQ 361 Mark

Leghaemoglobin takes part in:

A
Energy release
B
Stimulating growth of Rhizobium
C
$N_2$ absorption
✓
Protecting nitrogenase

Answer

Correct option: D.

Protecting nitrogenase

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MCQ 371 Mark

Bacillus thuringiensis is widely used as:

✓
Insecticide
B
Weedicides
C
Rodenticide
D
None of these

Answer

Correct option: A.

Insecticide

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MCQ 381 Mark

The term antibiotic was coined by:

A
Alexander Fleming
✓
$S.$ Waksman
C
Louis Pasteur
D
Edward Jenner

Answer

Correct option: B.

$S.$ Waksman

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MCQ 391 Mark

Yield of paddy field can be increased by application of:

A
Iron bacteria
✓
Nostoc$/$ Anabaena
C
Archae bacteria
D
Symbiotic bacteria

Answer

Correct option: B.

Nostoc$/$ Anabaena

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MCQ 401 Mark

The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is:

A
Vitamin $C.$
B
Vitamin $D.$
✓
Vitamin ${B}_{12}$.
D
Vitamin $E.$

Answer

Correct option: C.

Vitamin ${B}_{12}$.

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MCQ 411 Mark

Monascus purpureus is a yeast used commercially in the production of:

A
Ethanol
B
Streptokinase for removing clots from the blood vessels
C
Citric acid
✓
Bood cholesterol lowering statins

Answer

Correct option: D.

Bood cholesterol lowering statins

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MCQ 421 Mark

What would happen if oxygen availability to activated sludge flocs is reduced?

A
It will slow down the rate of degradation of organic matter.
✓
The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs.
C
Flocs would increase in size as anaerobic bacteria would grow around flocs.
D
Protozoa would grow in large numbers.

Answer

Correct option: B.

The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs.

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MCQ 431 Mark

Statins, a bioactive molecule, inhibits the enzyme responsible for synthesis of:

A
Carbohydrate
B
Protein
C
Vitamins
✓
Cholesterol

Answer

Correct option: D.

Cholesterol

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MCQ 441 Mark

The bacteria present in root nodules of leguminous plants that fixes the atmospheric nitrogen is:

✓
Rhizobium
B
Blue$-$green algae
C
Nitrifying bacteria
D
Paramoecium

Answer

Correct option: A.

Rhizobium

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MCQ 451 Mark

The last step of biogas formation is:

A
Acidogenesis
✓
Methanogenesis
C
Hydrolysis of organic substances
D
Solubilization of organic substances

Answer

Correct option: B.

Methanogenesis

Methanogenesis is the last step of biogas formation. Methanogenesis or biomethanation is the formation of methane by microbes known as methanogens. In most environments, it is the final step in the decomposition of biomass.

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MCQ 461 Mark

Rising of dough is due to:

A
Multiplication of yeast.
✓
Production of $CO_2$.
C
Emulsification.
D
Hydrolysis of wheat flour starch into sugars.

Answer

Correct option: B.

Production of $CO_2$.

Carbon dioxide creates bubbles in the dough and it leads to rising of dough.

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MCQ 471 Mark

$\text{VAM}$ is characterized by:

A
Intracellular vesicles
B
Intracellular arbuscules
✓
Both $A$ and $B$
D
Associative symbiosis

Answer

Correct option: C.

Both $A$ and $B$

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MCQ 481 Mark

Which of the following is a biofertilizer?

A
Funaria
B
Fern
✓
Anabaena
D
Escherichia coli

Answer

Correct option: C.

Anabaena

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MCQ 491 Mark

Methanogens do not produce:

✓
Oxygen
B
Ethane
C
Hydrogen sulfide
D
Carbon dioxide

Answer

Correct option: A.

Oxygen

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MCQ 501 Mark

The primary treatment of waste water involves the removal of:

✓
Stable particles.
B
Toxic substances.
C
Harmful bacteria.
D
Dissolved impurities.

Answer

Correct option: A.

Stable particles.

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Biology M.C.Q (1 Marks)

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