Question Set D

CBSE 12th Standard Biology Microbes in Human Welfare HOT Questions Study Material - QB365

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Questions:

Multiple Choice Question

55 x 1 = 55

'Good ozone' is found in the

(a)

mesosphere

(b)

troposphere

(c)

stratosphere

(d)

ionosphere

Which one of these is not a case of artificial selection?

(a)

shetland pony

(b)

great dane dog

(c)

broccoli

(d)

peppered moth

(e)

Arabian race horse

Which one of the following ancestors of man first time showed bipedal movement?

(a)

Australopithecus

(b)

Cro-magnon

(c)

Java apeman

(d)

Peking man

In humans, the oocyte is maintained in a state of meiotic arrest by secretion of

(a)

granulosa cells

(b)

zona pellucida

(c)

cumulus oophorus

(d)

theca

What is present in the middle piece of sperm?

(a)

acrosome

(b)

mitochondria

(c)

nucleus

(d)

proximal centriole

The embryo at 16 celled stage is known as

(a)

morula

(b)

gastrula

(c)

blastula

(d)

blastomere

the two gases making highest relative contribution to the green house gases are

(a)

CO₂ and N₂O

(b)

CO₂ and CH₄

(c)

CH₄ and N₂O

(d)

CFCs and N₂O

How many effective codons are there for the synthesis of twenty amino acids?

(a)

(b)

(c)

(d)

In genetic fingerprinting, 'the probe' refers to

(a)

a radioactively labelled double stranded RNA molecule

(b)

a radioactively labelled double stranded DNA molecule

(c)

a radio-actively labelled single stranded DNA molecule

(d)

a radioactively labelled single stranded RNA molecule

10.

Evolution can be studied now in action in

(a)

sphenodon

(b)

Archaeopteryx

(c)

Peppered moth

(d)

Paramecium

11.

Kanha National park is located in...and is famous for

(a)

Madhya Pradesh, elephant

(b)

Madhya Pradesh, tiger

(c)

Odisha, tiger

(d)

Assam, elephant

12.

Which of the following are not analogous organs?

(a)

fins of fishes and flippers of whales

(b)

stings of honey bee and scorpion

(c)

thorn of Bougainvillea and tendril of Cucurbita

(d)

wings of insect and wings of pterodactyl

13.

Edaphic factor refers to:

(a)

Water

(b)

Soil

(c)

Relative humidity

(d)

Altitude

14.

Climax community is in a state of:

(a)

non-equilibrium

(b)

equilibrium

(c)

disorder

(d)

constant change.

15.

Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a 'triplet'?

(a)

Hershey and Chase

(b)

Nirenberg and Mathaei

(c)

Morgan and Sturtevant

(d)

Beadle and Tatum

16.

Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid?

(a)

AUG, ACG-Start/methionine

(b)

UUA, UCA-Leucine

(c)

GUU, GCU-Alanine

(d)

UAG, UGA-stop

17.

Which one of the following is not used for construction of ecological pyramids?

(a)

fresh weight

(b)

dry weight

(c)

number of individuals

(d)

rate of energy flow

18.

Habitat loss and fragmentation, overexploitation, alien species invasion and coextinction are causes for

(a)

population explosion

(b)

migration

(c)

biodiversity loss

(d)

pollution

(e)

ecological succession

19.

Photosynthetic active radiation (PAR) has the following range of wavelengths

(a)

340-450 nm

(b)

400-700 nm

(c)

500-600 nm

(d)

450-950 nm

20.

Which one of the following diseases is spread by housefly?

(a)

Dengue fever

(b)

Encephalitis

(c)

Filariasis

(d)

Typhoid

21.

Prolonged libral irrigation of agricultural fields is likely to create the problem of

(a)

acidity

(b)

aridity

(c)

salinity

(d)

metal toxicity

22.

Example of corm is

(a)

Ginger

(b)

Colocasia

(c)

Onion

(d)

potato

23.

In your opinion, which is the most effective way to consrve the plant diversity of an area?

(a)

by creating a biosphere reverse

(b)

by creating botanical gardens

(c)

By developing seed bank

(d)

By tissue culture method

24.

There are various types of reproduction. The type of reproduction adopted by an organism depends on:

(a)

The habitat and morphology of the organism

(b)

Morphology of the organism

(c)

Morphology and physiology of the organism

(d)

The organism's habitat, physiology and genetic makeup

25.

Even in absence of pollinating agents, seed setting is assured in

(a)

Commelina

(b)

Zostera

(c)

Salvia

(d)

Fig

26.

Sexual reproduction in fungi may occur by means of

(a)

Zporangiospore

(b)

Zoospore, oospore and ascospore

(c)

Sporangiospore, ascospore and basidiospore

(d)

Oospore, ascospore and basidiospore

27.

Which of the following wall layers of anther plays a predominant role in its dehiscence?

(a)

Epidermis

(b)

Endothecium

(c)

Middle layers

(d)

Tapetum

28.

Popluation density of terrestrial organism is measured in terms of individual per

(a)

meter³

(b)

meter⁴

(c)

meter

(d)

meter²

29.

The popultation of an insect species show an explosive increase in numbers during rainly season followed by its disappearance at teh end of the season. What does this show?

(a)

the food plants mature and die at the end of the rainy season

(b)

its population growth curve is of J-type

(c)

the population of its predators increase

(d)

S-shaped or sigmoid growth of this insect.

30.

Niche overlap indicates

(a)

mutualism between two species

(b)

active cooperation between two species

(c)

two different parasites on the same host

(d)

sharing of one or more resources between the two species

31.

From among the sets of terms given below, identify those that are associated with gynoecium.

(a)

Stigma, ovule, embryo sac, placenta

(b)

Thalamus, pistil, style, ovule

(c)

Ovule, ovary, tapetum, embryo sac

(d)

Egg, integument, embryo sac, nucellus

32.

Bacillus thuringiensis is used to control

(a)

bacterial pathogens

(b)

fungal pathogens

(c)

nematodes

(d)

insect pests

33.

During transcription in eukaryotic cell the RNA splicing and RNA capping takes place inside the

(a)

Nucleus

(b)

Ribosomes

(c)

Dictyosomes

(d)

34.

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example.

(a)

colour change in chamaeleon

(b)

enlargement of body size by swallowing air in puffer fish

(c)

poison fangs in snakes

(d)

melanism in months

35.

More than 70% of livestock population is in :

(a)

Denmark

(b)

India

(c)

China

(d)

India and China

36.

A bacterial cell was transformed with a recombinant DNA that was generated using a human gene. However, the transformed cells did not produce the desired protein. Reasons could be:

(a)

Human gene may have intron which bacteria can not process

(b)

Amino acid codons for humans and bacteria are different

(c)

Human protein is formed but degraded by bacteria

(d)

All of the above

37.

Micro-propagation is :

(a)

propagation of microbes in vitro

(b)

propagation of plants in vitro

(c)

propagation of cells in vitro

(d)

growing plants on smaller scale

38.

Select the incorrect statement from the following :

(a)

Linkage is an exception to the principle of independent assortment in heredity.

(b)

Galactosemia is an inborn error of metabolism.

(c)

Small population size result in random genetic drift in a population.

(d)

Baldness is a sex-linked trait.

39.

Double fertilization is the process in plants that includes

(a)

Syngamy and triple fusion

(b)

only triple fusion

(c)

Development of antipodal cells

(d)

Name of the above

40.

Which one of the following is the most widely accepted method of contraception in India at present?

(a)

cervical caps

(b)

tubectomy

(c)

diaphragms

(d)

IUDs (Intra uterine devices)

41.

Methanogens do not produce

(a)

oxygen

(b)

methane

(c)

hydrogen sulfide

(d)

carbon dioxide

42.

In protoplast fusion the enzymes required

(a)

Celluase,hemicellulase,pectinase

(b)

Pectinase

(c)

Ligase,hemicellulase

(d)

Hemicellulase

43.

In-vitro fertilization is a technique that involves transfer of which one of the following into the fallopian tube??

(a)

Zygote only

(b)

Embryo only, upto 8 cell stage

(c)

Either zygote or early embryo foetus

(d)

embryo of 32 cell stage

44.

which one of the following is not a nitrogen-fixing organism?

(a)

Anabaena

(b)

Nostoc

(c)

Azotobacter

(d)

Pseudomonas

45.

Which of the following malarial parasites has the longest inculation period?

(a)

Plasmodium vivax

(b)

Plasmodium falciparum

(c)

Plasmodium ovale

(d)

Plasmodium malariae

46.

Golden rice is a transgenic crop of the future with the following improved trail:

(a)

Insect resistance

(b)

High lysine (essential amino acid) content

(c)

High protein content

(d)

high vitamin-A content

47.

Amniocentesis is a process to

(a)

determine any disease of heart

(b)

determine any hereditary disease of the embryo

(c)

know about the disease of brain

(d)

grow cell on culture medium

48.

Genetic engineering is possible because

(a)

the phenomenon of transduction in bacteria is well understood

(b)

we can see DNA by electron microscope

(c)

we can cut DNA at specific sites by endonucleases like DNAase 1

(d)

restriction endonucleases purified from bacteria can be used in vitro

49.

Opiates (opium, heroin) are obtained from

(a)

Papaver sominiferum

(b)

Cannabis sativa

(c)

Theobroma

(d)

Thea chinensis

50.

A self-fertilizing trihybrid plant forms

(a)

4 different gametes and 16 different zygotes

(b)

8 different gametes and 16 different zygotes

(c)

8 different gametes and 32 different zygotes

(d)

8 different gametes and 64 different zygotes

51.

Two crosses between the same pair of genotype or phenotypes in which the sources of the gametes are reversed in one cross, is known as

(a)

Reverse cross

(b)

Dihybrid cross

(c)

Test cross

(d)

Reciprocal cross

52.

A transgene expression can achieve which of the following?

(a)

Prevent expression of a native gene.

(b)

Modify an existing biosynthetic pathway.

(c)

Produce a protein that itself produces the phenotype of interest.

(d)

All of the above

53.

Superiority of hybrid over parents is

(a)

Digantism

(b)

Lethality

(c)

Heterosis

(d)

Dwarfism

54.

A good example of organic fertilizer which improves phosphorus uptake is

(a)

Actinomycetes fungi

(b)

Rhizobium

(c)

Azospirillum

(d)

None of these

55.

Name the cytologist who cultured anthers for the first time.

(a)

Hannig

(b)

Shima Kura

(c)

Sumuki

(d)

Yabuta

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Answers Key:

Multiple Choice Question

55 x 1 = 55

(d)
peppered moth

(a)
Australopithecus

(a)
granulosa cells

(b)
mitochondria

(b)
CO₂ and CH₄

(d)
61

10.

11.

(b)
Madhya Pradesh, tiger

12.

13.

(b)
Soil

14.

(b)
equilibrium

15.

(b)
Nirenberg and Mathaei

16.

(d)
UAG, UGA-stop

17.

(a)
fresh weight

18.

19.

(b)
400-700 nm

20.

(d)
Typhoid

21.

22.

(b)
Colocasia

23.

(a)
by creating a biosphere reverse

24.

(d)
The organism's habitat, physiology and genetic makeup

25.

(a)
Commelina

26.

(d)
Oospore, ascospore and basidiospore

27.

(b)
Endothecium

28.

(d)
meter²

29.

(b)
its population growth curve is of J-type

30.

(d)
sharing of one or more resources between the two species

31.

(a)
Stigma, ovule, embryo sac, placenta

32.

(d)
insect pests

33.

(d)
ER

34.

35.

(d)
India and China

36.

(a)
Human gene may have intron which bacteria can not process

37.

(b)
propagation of plants in vitro

38.

(d)
Baldness is a sex-linked trait.

39.

(a)
Syngamy and triple fusion

40.

(d)
IUDs (Intra uterine devices)

41.

(a)
oxygen

42.

(a)
Celluase,hemicellulase,pectinase

43.

44.

(d)
Pseudomonas

45.

(d)
Plasmodium malariae

46.

(d)
high vitamin-A content

47.

(b)
determine any hereditary disease of the embryo

48.

(d)
restriction endonucleases purified from bacteria can be used in vitro

49.

(a)
Papaver sominiferum

50.

(d)
8 different gametes and 64 different zygotes

51.

(d)
Reciprocal cross

52.

(d)
All of the above

53.

54.

55.

(b)
Shima Kura

CBSE 12th Standard Biology Microbes in Human Welfare HOT Questions Study Material - QB365 Set D

QB365 Student Learing Managemnet System

Std: 12th Standard CBSE - Biology

chapter: Microbes in Human Welfare - HOT Questions

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Questions:

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