Question Set C

CBSE 12th Standard Biology Biodiversity and Conservation HOT Questions Study Material - QB365

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Questions:

Bio fertilisers include:

(a)

Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi

(b)

Blue-green algae, rhizobia and other nitrogen fixings bacteria

(c)

Rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi

(d)

Blue green algae, rhizobia and mycorrhiza fungi

In order to obtain disease-free plants through tissue culture techniques, the best method is

(a)

Embryo rescue

(b)

Anther culture

(c)

Protoplast culture

(d)

Meristem culture

Viral genome incorporated into host DNA is called

(a)

Prophase

(b)

Prophage

(c)

Bacteriophage

(d)

None of these

The plant part which consists of two generations one within the other is

(a)

Germinated pollen grain

(b)

seed

(c)

Unfertilized ovule

(d)

Embryo

Cyclosporin-A an immunosuppressive drug is produced by

(a)

Aspergillus niger

(b)

Manascus purpureus

(c)

Penicillium notatum

(d)

Trichoderma polysporum

When a cluster of genes show linkage behaviour they

(a)

Do not show independent assortment

(b)

Do not show a chromosome map

(c)

Show recombination during meiosis

(d)

Induce cell division

Given below are the four methods and their modes of action in achieving contraception.Select their correct matching from the four options that follows.

control measures	Mode of Action
(A) Pill	1. Prevents sperms reaching cervix
(B) Condom	2. Prevents implication
(C)Vasectomy	3. Prevents ovulation
(D) Copper T	4. Semen contains no sperms

(a)

A	B	C	D
3	4	1	2

(b)

A	B	C	D
2	3	1	4

(c)

A	B	C	D
3	1	4	2

(d)

A	B	C	D
4	1	2	3

Initiator (starting) codon in eukaryotes is

(a)

AUG

(b)

AAG

(c)

CCU

(d)

GGC

Anthesis is a phenomenon which refers to

(a)

Formation of pollen

(b)

Development of anther

(c)

the opening of a flower bud

(d)

Reception of pollen by stigma

10.

Morphine obtained from Opium is

(a)

Latex

(b)

Pome

(c)

Alkaloid

(d)

Tannin

11.

The correct surgical procedure as a contraceptive method is:

(a)

Ovariectomy

(b)

Hysterectomy

(c)

Vasectomy

(d)

Castration

12.

If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?

(a)

Serum globulins

(b)

Fibrinogen in the plasma

(c)

Haemocytes

(d)

Serum albumins

13.

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

14.

Somaclonal variation appears in plants:

(a)

Growing in polluted soil or water

(b)

Exposed to gamma rays

(c)

Raised in tissue culture

(d)

Transformed by recombinant DNA technology

15.

The linking of antibiotic resistance gene with the plasmid vector became possible with

(a)

DNA polymerase

(b)

Exonuclease

(c)

DNA ligase

(d)

Enonucleases

16.

Which one is the most important role of microorganism of the well being of humans?

(a)

sewage treatment

(b)

production of methane

(c)

production of SO₂

(d)

conversion of milk to curd

17.

Indicate, the inheritance of which of the following is controlled by multiple alleles

(a)

Colour blindness

(b)

Sickle cell anaemia

(c)

Blood group

(d)

Phenylketoneuria

18.

Molecular scissors which cut DNA at specific site is

(a)

Pectinase

(b)

Polymerase

(c)

Restriction endonuclease

(d)

Ligase

19.

Which one of the following is surrounded by a callose wall?

(a)

Male gamete

(b)

Egg

(c)

Pollen grain

(d)

Microspore mother cell

20.

The plant in which hugo de vries introduced the concept of multation

(a)

Oenothera lamarkiana

(b)

Pisum sativum

(c)

Allium cepa

(d)

Mirabilis jalapa

21.

The two polynucleotide chains in DNA are

(a)

Discontinuous

(b)

Antiparallel

(c)

Semiconservative

(d)

Parallel

22.

Golden rice is a promising transgenic crop. When released for cultivation, it will help in

(a)

Producing a petrol-like fuel from rice

(b)

alleviation of vitamin A

(c)

pest resistance

(d)

heribcide tolerance

23.

The biggest constraint of plant breeding is :

(a)

availability of desirable gene in the crop and its wild relatives

(b)

infrastructure

(c)

trained manpower

(d)

transfer of genes from unrelated sources

24.

Polyethylene glycol method is used for

(a)

Biodiesel production

(b)

Seedless fruit production

(c)

Energy production from sewage

(d)

Gene transfer without a vector

25.

Which of the following is commonly used in transfer of foreign DNA into crop plants?

(a)

Meloidogyne incognita

(b)

Agrobacterium tumefaciens

(c)

Penicillium expansum

(d)

Trichoderma harzianum

26.

What is true about Bt toxin?

(a)

Bt toxin exists as active toxin in the Bacillus

(b)

The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication

(c)

The concerned Bacillus has anti toxins

(d)

The inactive prototoxin gets converted into active form in the insect gut

27.

Embryo sac is to ovule __________ is to an anther

(a)

Stamen

(b)

Filament

(c)

Pollen grain

(d)

Androecium

28.

Select the statement which explains best parasitism.

(a)

One organism is benefitted.

(b)

Both the organisms are benefitted

(c)

One organism is benefitted, other is not affected

(d)

One organism is benefitted, other is affected.

29.

Match the following and choose the correct answer.

column I	column II
A. Phobia	1. Maladaptive hait
B. Neurosis	2. Undue concern about health
C. Hypochondria	3. Lack of sleep
D. Insomnia	4. Intense feat

(a)

A-2, B-1, C-4, D-3

(b)

A-2, B-1, C-3, D-4

(c)

A-4, B-1, C-3, D-2

(d)

A-3, B-4, C-2, D-1

(e)

A-4, B-1, C-2, D-3

30.

Which one of the following species of bees is used for the commercial production of honey?

(a)

Apis dorsata

(b)

Apis indica

(c)

Apis florea

(d)

Apis mellifera

31.

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.

32.

A pea plant parent having violet colour flowers with unknown genotype was crossed with a plant having white colour flowers, in the progeny 50% flowers were violet and 50% were white. The genotypic constitution of the parent having violet colour flower was

(a)

Homozygous

(b)

Merozygous

(c)

Heterozygous

(d)

Hemizygous

33.

To speed up the malting process in brewing industry, the growth hormone used is

(a)

auxin

(b)

gibberellic acid

(c)

kinetin

(d)

ethylene

34.

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

35.

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

36.

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

37.

Which one of the following is a pair of endangered species?

(a)

Garden lizard and Mexican poppy

(b)

Rhesus monkey and sal tree

(c)

Indian peacock and Carrot grass

(d)

Hornbill and Indian Aconite

38.

Which one of the following processes results in the formation of clone of bacteria?

(a)

Transformation

(b)

Transduction

(c)

Binary Fission

(d)

Conjugation

39.

A person with sickle cell anemia is

(a)

More prone to malaria

(b)

More prone to typhoid

(c)

Less prone to malaria

(d)

Less prone to typhoid

40.

Amensalism is an association between two species where:

(a)

one species is harmed and other is benefitted

(b)

one species is harmed and other is unaffected

(c)

one species is benefitted and other is unaffected

(d)

both the species are harmed

41.

More than 70% of world's fresh water is contained in

(a)

polar ice

(b)

glaciers and mountains

(c)

Antarctica

(d)

Greenland

42.

Cuscuta is an example of

(a)

ectoparasitism

(b)

brood parasitism

(c)

predation

(d)

endoparasitism

43.

Which one of the following pairs of organisms are exotic species introduced in India?

(a)

Lantana camera, Water hyacinth

(b)

Water hyacinth, Prosopis cinereria

(c)

Nile perch, Ficus religiosa

(d)

Ficus religiosa, Lantana Camara

44.

In a polluted environment, the maximum pollutant will occur to

(a)

primary produces

(b)

tertiary consumers

(c)

secondary consumers

(d)

primary consumers

45.

The '10 per cent law' is related to

(a)

Mendelian genetics

(b)

non-mendelian genetics

(c)

energy transfer from lower trophic level to higher trophic level

(d)

energy consumption during photosynthesis in C₄ plants

46.

Mass of living matter at a trophic level in an area at any time is called

(a)

standing crop

(b)

detritus

(c)

humans

(d)

standing state

47.

In an aquatic ecosystem, the trophic level equivalent to cows in grasslands is

(a)

phytoplankton

(b)

zooplankton

(c)

nekton

(d)

benthos

48.

The correct sequence of spermatogenic stages leading to the formation of sperms in a mature human testis is

(a)

spermatogonia-spermatid-spermatocyte-sperms

(b)

spermatocyte-spermatogonia-spermatid-sperms

(c)

spermatogonia-spermatocyte-spermatid-sperms

(d)

spermatid-spermatocyte-spermatogonia-sperms

49.

While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were: Adenine=29%, Guanine=17%, Cytosine=32%, Thymine=17%. Considering the Chargaffs rule it can be concluded that:

(a)

it is a double stranded circular DNA

(b)

it is single stranded DNA

(c)

it is a double stranded linear DNA

(d)

No conclusion can be drawn

50.

If global warming continues, the organism which may face more severe threat is

(a)

cow

(b)

banana

(c)

snow leopard

(d)

dolphin

51.

Amniocentesis is a technique used to

(a)

Determine errors in amino acid metabolism in embryo

(b)

Pinpoint specific cardiac ailments in embryo

(c)

Determine any hereditary/genetic abnormality in embryo

(d)

All of these

52.

Transposons are:

(a)

house keeping genes

(b)

jumping genes

(c)

transporting genes

(d)

stationary genes

53.

Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?

(a)

they were partially isolated from the surroundings

(b)

they could maintain an internal environment

(c)

they were able to reproduce

(d)

they could separate combinations of molecules from the surroundings

54.

One of the following is not a green house gas:

(a)

CO₂

(b)

CH₄

(c)

Ethane

(d)

N₂O

55.

Hardy-Weinberg equilibrium is known to be affected by

(a)

evolution

(b)

limiting factors

(c)

saltation

(d)

natural selection

56.

The embryo at 16 celled stage is known as

(a)

morula

(b)

gastrula

(c)

blastula

(d)

blastomere

57.

Positive feedback loop signals from fully developed fetus and placenta ultimately lead to parturition which requires the release of

(a)

estrogen from the placenta

(b)

relaxing from placenta

(c)

oxytocin from fetal pituitary

(d)

oxytocin from maternal pituitary

58.

Amphibians were dominant during

(a)

Carboniferous

(b)

silurian

(c)

ordovician

(d)

cambrian

(e)

jurassic

59.

Reproductive isolation between segments of a single population is termed

(a)

sympatry

(b)

allopatry

(c)

population divergence

(d)

disruptive divergence

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Answers Key:

(a)
Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi

(d)
Meristem culture

(b)
Prophage

(b)
seed

(d)
Trichoderma polysporum

(a)
Do not show independent assortment

(a)
AUG

10.

11.

12.

(a)
Serum globulins

13.

14.

15.

16.

(a)
sewage treatment

17.

18.

19.

(d)
Microspore mother cell

20.

(a)
Oenothera lamarkiana

21.

(b)
Antiparallel

22.

(b)
alleviation of vitamin A

23.

(d)
transfer of genes from unrelated sources

24.

(d)
Gene transfer without a vector

25.

(b)
Agrobacterium tumefaciens

26.

(d)
The inactive prototoxin gets converted into active form in the insect gut

27.

28.

(d)
One organism is benefitted, other is affected.

29.

(e)
A-4, B-1, C-2, D-3

30.

(d)
Apis mellifera

31.

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

32.

33.

(b)
gibberellic acid

34.

(d)
Oospore, ascospore and basidiospore

35.

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

36.

(a)
by creating a biosphere reverse

37.

(d)
Hornbill and Indian Aconite

38.

39.

40.

41.

(a)
polar ice

42.

(a)
ectoparasitism

43.

(a)
Lantana camera, Water hyacinth

44.

(b)
tertiary consumers

45.

46.

(a)
standing crop

47.

(b)
zooplankton

48.

49.

(b)
it is single stranded DNA

50.

51.

52.

(b)
jumping genes

53.

54.

55.

(d)
natural selection

56.

57.

(d)
oxytocin from maternal pituitary

58.

(a)
Carboniferous

59.

(a)
sympatry

CBSE 12th Standard Biology Biodiversity and Conservation HOT Questions Study Material - QB365 Set C

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Std: 12th Standard CBSE - Biology

chapter: Biodiversity and Conservation - HOT Questions

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Questions:

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Answers Key:

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