Question Set D

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

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Questions:

Which of the following statements is true of yeast?

(a)

The cell divides by binary fission. One of them develops into a bud.

(b)

The cell divides unequally. The smaller cell develops into a bud.

(c)

The cell produces conidia, which develop into a bud.

Which of the following statements is true of Bryophyllum?

(a)

Germinating bud appears from the eye of the stem tuber.

(b)

Germinating bud appears from the node of the rhizome.

(c)

Geminating bud appears from the notch at the leaf margin.

Which one of the following statements is true of cucurbits?

(a)

It is monoecious producing both staminate and pistillate flowers in the same plant.

(b)

It is monoecious producing staminate and pistillate flowers in two different plants.

(c)

It is dioecious producing staminate flowers in one plant and pistillate flowers in another.

Which of the following statement is true of Hydra?

(a)

It produces asexual gemmules

(b)

It produces unicellular bud

(c)

It produces multicellular bud.

Which of the followin statements is true of Hydra?

(a)

It produces asexual gemmules

(b)

It produces unicellular bud.

(c)

It produces multicellur bud.

Which one of the following has the largest population in a food chain?

(a)

Producers

(b)

Primary consumers

(c)

Secondary consumers

(d)

Decomposers

The second trophic level in a lake is

(a)

Phytoplankton

(b)

Zooplankton

(c)

Benthos

(d)

Fishes

Second most important trophic level in a lake is

(a)

Phytoplankton

(b)

Zooplankton

(c)

Benthas

(d)

Fishes

Secondary producers are

(a)

Herbivores

(b)

Producers

(c)

Carnivores

(d)

None of the above

10.

Which of the following is included in biopesticide?

(a)

Viruses and bacteria

(b)

Viruses, bacteria and fungi

(c)

Viruses, bacteria, fungi, protozoa and mites

(d)

Viruses, bacteria, fungi and protozoa

11.

In hybridization, the haploids combine the advantages of

(a)

Recombination

(b)

Segregation

(c)

Fixation

(d)

All of them

12.

Which one of the following is not s secondary metabolite?

(a)

Resins

(b)

Essential oils

(c)

Amino acids

(d)

Tannins

13.

Which one of the following substance is responsible for callus formation

(a)

2,4-D

(b)

NAA

(c)

BAP

(d)

PEG

14.

Who gave the idea that every plant cell is totipotent

(a)

P.R White

(b)

E.C Cocking

(c)

F.C Staward

(d)

G.Haberlandt

15.

Which of the following can be controlled by using biopesticides?

(a)

Insects

(b)

Diseases

(c)

Weeds

(d)

All of them

16.

Human genome project was discovered by

(a)

Francis Collins and Roderick

(b)

Watson and Crick

(c)

Beadle and Tatum

(d)

Paul Berg and Wollman

17.

Bacillus thuringiensis (Bt) strains have been used for designing novel

(a)

Biofertilizers

(b)

Bio-metallurgical techniques

(c)

Bio-mineralization processes

(d)

Bio-insecticidal plants

18.

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

19.

Egg apparatus consists of

(a)

egg

(b)

egg and polar nuclei

(c)

Egg and synergids

(d)

Egg and antipodal cells

20.

Name the cytologist who cultured anthers for the first time.

(a)

Hannig

(b)

Shima Kura

(c)

Sumuki

(d)

Yabuta

21.

L.S.D, morphine and bhang are respectively obtained from

(a)

Claviceps, Papaver and Cannabis

(b)

Claviceps, Cannabis and Rauwolfia

(c)

Cannabis, Claviceps and Fuscarium

(d)

Claviceps, Rauwolfia and Papaver

22.

Transgenic plants are developed by

(a)

clone and genetically modified genes

(b)

introduction of foreign genes

(c)

genetic engineering

(d)

purified genes

23.

In which one of the following the BOD (Bio-chemical Oxygen Demand) of Sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order:

(a)

SE < PE < S < DE

(b)

PE < S < SE < DE

(c)

S < DE < PE < SE

(d)

SE < S < PE < DE

24.

Hashish and Ganja are got from

(a)

Erythroxylon

(b)

Nicotiana

(c)

Papaver

(d)

Cannabis

25.

The stimulant present in tea, cocoa and cola drinks is

(a)

Cocaine

(b)

Tannin

(c)

Astringent

(d)

Caffeine

26.

Intraspecific incompatibility can be overcome by

(a)

Wetting of anthers

(b)

Mixed pollination

(c)

Intraovarian fertilization

(d)

Intraspecific competition

27.

Restriction endonucleases are most widely used in recombinant DNA technology. They are obtained from

(a)

Bacteriophages

(b)

Bacterial cells

(c)

Plasmids

(d)

All prokaryotic cells

28.

Which is used in molecular genetic engineering?

(a)

Tomato

(b)

Tobacco

(c)

Carrot

(d)

Arabidopsis

29.

LSD is

(a)

Lying diethylamide

(b)

Lysergic acid diethylamide

(c)

Lysing dimethylamide

(d)

Lysergic acid diethylamide

30.

Viral genome incorporated into host DNA is called

(a)

Prophase

(b)

Prophage

(c)

Bacteriophage

(d)

None of these

31.

Which type of association is found in between entomophilous flower and pollinating agent?

(a)

Mutualism

(b)

Commensalism

(c)

Cooperation

(d)

Coevolution

32.

Jumping genes given by Barbara Mclintock are also called

(a)

Transposons

(b)

Mutons

(c)

Cistrons

(d)

Vectors

33.

In angiosperms, pollen tubes liberate their male gametes into the

(a)

Central cell

(b)

Antipodal cell

(c)

Egg cell

(d)

Synergids

34.

Heterozygous purple flower is crossed with recessive white flower. The progeny has the ratio :

(a)

75% purple and 25% white

(b)

50% purple and 50% white

(c)

All purple

(d)

All white

35.

Which of the following properties of acquired immunity is the basis of vaccination?

(a)

Specificity

(b)

Diversity

(c)

Memory

(d)

Discrimination between self and non self.

36.

Nitrogenous base sequence in one strand of DNA is ATGCTTGA, the sequence in the complementary strand will be

(a)

TAGGTAGT

(b)

TACGAACT

(c)

TACGTACT

(d)

TCCGAACT

37.

Superiority of hybrid over parents is

(a)

Digantism

(b)

Lethality

(c)

Heterosis

(d)

Dwarfism

38.

Immunodeficiency can result from which of the following?

(a)

Gene mutation

(b)

Infection

(c)

Malnutrition

(d)

All of the above

39.

Insect-pollinated flowers are characterized by

(a)

Large number of pollens

(b)

Dry and smooth pollens

(c)

Sticky and rough pollens

(d)

Heavy pollens

40.

Which of the following is used in biowar

(a)

A pathogen

(b)

Toxin from a pathogen

(c)

A delivery system for the bioweapon agent

(d)

All of the above

41.

Which of the following combinations of risk are associated with genetically modified food?
I. Toxicity
II. Allergic reaction
III. Antibiotic resistance in micro-organisms present in the alimentary canal.

(a)

I and II

(b)

I, II and III

(c)

I and III

(d)

II and III

42.

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

43.

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

44.

That the mode of DNA replication is semiconservative was demonstrated by

(a)

Khorana

(b)

Watson and Crick

(c)

Meselson and Stahl

(d)

Tayler

45.

Insect resistance trangenic cotton has been produced by inserting a piece of DNA from

(a)

an insect

(b)

a bacterium

(c)

a wild relative of cotton

(d)

a virus

46.

In human beings, the eggs are:

(a)

Skin lecithal

(b)

Macrolecithal

(c)

Mesolecithal

(d)

Alecithal

47.

Female heterogamy is found in

(a)

Birds

(b)

Grasshopper

(c)

Both a and b

(d)

Drosophila

48.

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt

(a)

50% will be tall with red fruit

(b)

75% will be tall with red fruit

(c)

all the offspring will be tall with red fruit

(d)

25% will be tall with red fruit

49.

In a flowering plant, archesporium gives rise to

(a)

only the wall of the sporangium

(b)

both wall and the sporogenous cells

(c)

wall and the tapetum

(d)

Only tapetum and sporogenous cells

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.

In DNA replication, leading strand replicates in

(a)

5' ------>3' direction continuously

(b)

3'------>5' direction continuously

(c)

5'----->3' directiom discontinuosly

(d)

3,------->5' direction discontinuously

52.

Temin and Baltimore are associated with the discovery of

(a)

RNA synthesis

(b)

Transcription

(c)

Reverse transcription

(d)

photorespiration

53.

Hybridoma technology has been successfully used in

(a)

production of somatic hybrids

(b)

synthesis of monoclonal antibodies

(c)

synthesis of haemoglobin

(d)

production of alcohol in bulk

54.

Which of the following birth control measures can be considered as the safest?

(a)

the rhythm method

(b)

the use of physical barriers

(c)

termination of unwanted pregnancy

(d)

sterilization techniques

55.

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

56.

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

57.

Which of the following is the component of oral pills?

(a)

Progesterone

(b)

Oxytocin

(c)

Relaxin

(d)

None of these

58.

Choose the correct answer regarding the ZIFT procedure?

(a)

Ova collected from a female donor are transferred to the fallopian tube to facilitate zygote formation.

(b)

Zygote is collected from a female donor and transferred to the fallopian tube.

(c)

Zygote is collected from a female donor and transferred to the uterus

(d)

Ova collected from a female donor and transferred to the uterus

59.

Which of the following walked like gorillas and chimpanzees?

(a)

Dryopithecus

(b)

Ramapithecus

(c)

Both (a) and (b)

(d)

Australopithecus

60.

The turtle and tortoise evolved from

(a)

Amphibians

(b)

Fishes

(c)

Mammals

(d)

None of these

61.

Which of the following evolved first

(a)

Homo Sapiens

(b)

Homo habilis

(c)

Homo erectus

(d)

Tyrannosaurus

62.

Which of the following walked upright?

(a)

Dryopithecus

(b)

Ramapithecus

(c)

Both (a) and (b)

(d)

Australopithecus

63.

Lichens are well known combination of an alga and a fungus where fungus has

(a)

an epiphytic relationship with the alga

(b)

a parasitic relationship with the alga

(c)

a symbiotic relationship with the alga

(d)

a saprophytic relationship with alga

64.

Maximum growth rate occurs in

(a)

senescent phase

(b)

lag phase

(c)

exponential phase

(d)

stationary phase

65.

Zone of atmosphere near the earth surface is

(a)

Stratosphere

(b)

Mesosphere

(c)

Troposphere

(d)

Thermosphere

66.

In which one of the following habitats does the diurnal temperature of soil surface vary most?

(a)

Forest

(b)

Desert

(c)

Grassland

(d)

Shrub land

67.

Photosynthetically active radiation (PAR) represents the following range of wavelength

(a)

450-950 nm

(b)

340-450 nm

(c)

400-700 nm

(d)

500-600 nm

68.

A terrestrial animal must be able to

(a)

Conserve water

(b)

Actively pumps salts out through the skin

(c)

Excrete large amounts of salt in urine

(d)

Excrete large amounts of water in urine

69.

In 1984, the Bhopal gas tragedy took place because methyl isocyanate

(a)

Reacted with ammonia

(b)

Reacted with CO₂

(c)

Reacted with water

(d)

Reacted with DDT

70.

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

71.

Lead conc. in blood is considered alarming if it is

(a)

30 \(\mu \)g/100 ml

(b)

4 - 6 \(\mu \)g/100 ml

(c)

10 \(\mu \)g/100 ml

(d)

20 \(\mu \)g/100 ml

72.

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

73.

Blood analysis of a patient reveals an usually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct? The patient has been inhaling polluted air containing unusually high content of

(a)

Chloroform

(b)

Carbondioxide

(c)

Carbon monoxide

(d)

Carbon disulphide

74.

If the Bengal tiger becomes extinct

(a)

Hyaenas and Wolves will become scarce

(b)

The wild areas will be safe for man and domestic animals

(c)

its gene pool will be lost forever

(d)

The population of beautiful animals like deers will get stabilized

75.

Common indicator organism of water pollution is

(a)

Eichhornia crassipes

(b)

Escherchia coli

(c)

Entamoeba histolytica

(d)

Lemna pancicostata

76.

Which of the following animals is protected in Kaziranga Sanctuary of Assam?

(a)

Indian bison

(b)

Indian lion

(c)

Indian rhinoceros

(d)

Indian elephant

77.

The noise produced in office is normally at the level of

(a)

20 db

(b)

30 db

(c)

40 db

(d)

60 db

78.

Which of the following is not done in a wildlife sanctuary?

(a)

fauna is conserved

(b)

flora is conserved

(c)

soil and flora is utilized

(d)

hunting is prohibited

79.

Nitrogen oxides produced from the emission of automobiles and power plants, are the source of fine air born particles which lead to

(a)

Photochemical ring

(b)

Dry acid deposition

(c)

Industrial smog

(d)

Wet acid deposition

80.

Some important events in the human female reproductive cycle are given below.Arrange the events in a proper sequence.A-secretion of FSH, B-growth of corpus luteum, C-growth of the follicle and oogenesis, D-ovulation, E-sudden increase in the levels of LH

(a)

A D C E B

(b)

B A C D E

(c)

C A D B E

(d)

A C E D B

81.

Identify the correctly matched pair/pairs of the germ layers and their derivatives.
A.ectoderm-epidermis B. endoderm-dermis
C. mesoderm-muscles D. mesoderm-notochord
E. endoderm-enamel of teeth

(a)

A and D only

(b)

A and B only

(c)

A, C and D only

(d)

A, B, C and E only

82.

1st polar body is formed at which state of oogenesis?

(a)

1st meiosis

(b)

2nd mitosis

(c)

1st mitosis

(d)

differentiation

83.

Foetal ejection reflex in human female is induced by

(a)

differentiation of mammary glands

(b)

the pressure exerted by amniotic fluid

(c)

the release of oxytocin from pituitary

(d)

fully developed foetus and placenta

84.

Presence of gills in the tadpole of frog indicates that

(a)

fishes evolved from frog-like ancestors

(b)

frogs will have gills in future

(c)

frogs evolved from gilled ancestors

(d)

fishes were amphibious in the past

85.

Which of the following is a living fossil?

(a)

Moss

(b)

Saccharomyces

(c)

Spirogyra

(d)

Cyas

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Answers Key:

(b)
The cell divides unequally. The smaller cell develops into a bud.

(a)
It is monoecious producing both staminate and pistillate flowers in the same plant.

(a)
Producers

(b)
Zooplankton

(b)
Zooplankton

(a)
Herbivores

10.

11.

(d)
All of them

12.

13.

(a)
2,4-D

14.

(a)
P.R White

15.

(d)
All of them

16.

(a)
Francis Collins and Roderick

17.

(d)
Bio-insecticidal plants

18.

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

19.

20.

(b)
Shima Kura

21.

(a)
Claviceps, Papaver and Cannabis

22.

(b)
introduction of foreign genes

23.

(b)
PE < S < SE < DE

24.

(d)
Cannabis

25.

(d)
Caffeine

26.

(b)
Mixed pollination

27.

(b)
Bacterial cells

28.

(d)
Arabidopsis

29.

(b)
Lysergic acid diethylamide

30.

(b)
Prophage

31.

(a)
Mutualism

32.

(a)
Transposons

33.

(d)
Synergids

34.

(b)
50% purple and 50% white

35.

36.

(b)
TACGAACT

37.

38.

(d)
All of the above

39.

40.

(d)
All of the above

41.

(b)
I, II and III

42.

(d)
All of the above

43.

(d)
Reciprocal cross

44.

45.

(b)
a bacterium

46.

(d)
Alecithal

47.

Birds

48.

(b)
75% will be tall with red fruit

49.

(b)
both wall and the sporogenous cells

50.

(d)
8 different gametes and 64 different zygotes

51.

(a)
5' ------>3' direction continuously

52.

53.

(b)
synthesis of monoclonal antibodies

54.

(d)
sterilization techniques

55.

56.

(b)
determine any hereditary disease of the embryo

57.

(a)
Progesterone

58.

(b)
Zygote is collected from a female donor and transferred to the fallopian tube.

59.

(a)
Dryopithecus

60.

(d)
None of these

61.

(d)
Tyrannosaurus

62.

(b)
Ramapithecus

63.

64.

65.

66.

(b)
Desert

67.

68.

(a)
Conserve water

69.

70.

(a)
by creating a biosphere reverse

71.

(b)
4 - 6 \(\mu \)g/100 ml

72.

(d)
Hornbill and Indian Aconite

73.

74.

75.

(b)
Escherchia coli

76.

77.

(d)
60 db

78.

79.

(a)
Photochemical ring

80.

(d)
A C E D B

81.

82.

(a)
1st meiosis

83.

(d)
fully developed foetus and placenta

84.

85.

(d)
Cyas

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

QB365 Student Learing Managemnet System

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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