Bihar Board 12th Biology Objective Important Questions Part 3

Bihar Board 12th Biology Objective Important Questions Part 3

BSEB 12th Biology Objective Important Questions Part 3

Question 1.
The number of Linkage groups in a cell having 2n = 20 are
(a) 5
(b) 10
(c) 15
(d) 20
Answer:
(b) 10

Question 2.
Anemophily can best be seen in:
(a) Maize
(b) Vallisneria
(c) Salvia
(d) Yueca
Answer:
(a) Maize

Question 3.
Wucheria wankrufu causes filaria in human being is a:
(a) Protozoa
(b) Bacteria
(c) Virus
(d) Helminth
Answer:
(d) Helminth

Question 4.
Widal test in done to confirm:
(a) Malaria
(b) Typhoid
(c) AIDS
(d) Cancer
Answer:
(b) Typhoid

Question 5.
Which of the following enzyme is used to cleave the DNA for recombinant DNA technology:
(a) Restriction endonuclease
(b) Topoisomerase (I)
(c) Topoisomerase (II)
(d) Ligase
Answer:
(a) Restriction endonuclease

Question 6.
Termination of Transcription is brought about by:
(a) Co-protein
(b) Sigma-factor
(c) Rho-protein
(d) Omega factor
Answer:
(c) Rho-protein

Question 7.
Gestation period in humans is:
(a) 10 weeks
(b) 25 weeks
(c) 28 weeks
(d) 36 weeks
Answer:
(d) 36 weeks

Question 8.
Lysozyme is present in:
(a) Saliya
(b) Gastric enzymes
(c) Tears
(d) Pancreatic juice
Answer:
(c) Tears

Question 9.
An antibody molecule has:
(a) One polypeptide chain
(b) Two polypeptide chain
(c) Three polypeptide chain
(d) Four polypeptide chain
Answer:
(d) Four polypeptide chain

Question 10.
In DNA, if adenine = a, guanine = b, cytosine = c and thymine = d. Which of the following represent correct equation
(a) a + b = b + c
(b) a + b = c + d
(c) a + c = b + d
(d) a + d = b + c
Answer:
(b) a + b = c + d

Question 11.
Which of the following sites RNA polymerase attaches to for transcription
(a) Promoter
(b) Regulator
(c) Structural
(d) None
Answer:
(a) Promoter

Question 12.
The nutritive cells found in seminiferous tubules are:
(a) Sertoli cells
(b) Leydig cells
(c) Spermatogonial cells
(d) Epithelial cells
Answer:
(a) Sertoli cells

Question 13.
The Single Shield shaped Cotyledon in monocots is called:
(a) Seutellum
(b) Epiblast
(c) Tigellum
(d) None of the above
Answer:
(a) Seutellum

Question 14.
The term coupling & repulsion are two sides of the same coin of:
(a) Linkage
(b) Synapsis
(c) Disjunction
(d) Non-disjunction
Answer:
(b) Synapsis

Question 15.
Secondary producers are:
(a) Herbivores
(b) Producers
(c) Carnivores
(d) None
Answer:
(a) Herbivores

Question 16.
The genotypic ratio in monohybrid cross is:
(a) 3 : 1
(b) 9 : 3 : 3 : 1
(c) 1 : 2 : 1
(d) None
Answer:
(c) 1 : 2 : 1

Question 17.
Exposure of X-rays increases the frequency of:
(a) Crossing over
(b) Non ctoss-over
(c) Linkage
(d) Independent assortment
Answer:
(a) Crossing over

Question 18.
The colour of human blood is red due to presence of:
(a) Haemozoin
(b) Haemoglobin
(c) Iron
(d) Red pigment
Answer:
(b) Haemoglobin

Question 19.
The science of raising, feeding, management & breeding of animals is called:
(a) Veterinary Science
(b) Dairy Science
(c) Cattle farming
(d) Animal husbandry
Answer:
(d) Animal husbandry

Question 20.
The fusion of male gamete with secondary nucleus is known as:
(a) Syngamy
(b) Xenogamy
(c) Triple fusion
(d) None
Answer:
(c) Triple fusion

Question 21.
Which one is a sex-linked disease?
(a) Sickle-cell anaemia
(b) Phenylketonuria
(c) Haemophilia
(d) Albinism
Answer:
(c) Haemophilia

Question 22.
When the anthers mature before the stigma, it is known as:
(a) Dicliny
(b) Heterostyly
(c) Protandry
(d) Protogyny
Answer:
(c) Protandry

Question 23.
Copper-T prevents.
(a) Ovulation
(b) Pollination
(c) Fertilisation
(d) Implantation
Answer:
(a) Ovulation

Question 24.
An exception of Mendel’s is law is:
(a) Dominance
(b) Purity of gametes
(c) Linkage
(d) Independent assortment
Answer:
(c) Linkage

Question 25.
What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiation?
(a) 100%
(b) 50%
(c) 1.5%
(d) 2.1%
Answer:
(b) 50%

Question 26.
“Syndrome” means:
(a) Diseased condition
(b) Virulency of pathogens
(c) Malignancy
(d) A group of symptoms
Answer:
(d) A group of symptoms

Question 27.
Vector insects are those which:
(a) Spread disease
(b) Destroy crops
(c) Cause disease
(d) Destroy humans
Answer:
(a) Spread disease

Question 28.
In F₂ generation, phenotypic & genotypic ratios are similar in:
(a) Monohybrid cross
(b) Dihybrid cross
(c) Incomplete dominance
(d) Complementary genes
Answer:
(c) Incomplete dominance

Question 29.
In DNA, A equals:
(a) C
(b) G
(c) T
(d) None
Answer:
(c) T

Question 30.
Crystals of Bt toxins produced by some bacteria do not kill the bacteria themselves because:
(a) Bacteria are resistant to the toxin
(b) Toxin in not matured
(c) Toxins are inactive
(d) Bacteria incloses toxins in a special sac.
Answer:
(c) Toxins are inactive

Question 31.
The chromosomal constitution of klinefelter’s syndrome is:
(a) 2A + XY
(b) 2A + XO
(c) 2A + XX
(d) 2A + XXY
Answer:
(d) 2A + XXY

Question 32.
The fusion of male gamete with secondary nucleus Is known as
(a) Syngamy
(b) Xenogamy
(c) Triple fusion
(d) None
Answer:
(c) Triple fusion

Question 33.
Select the statement which explains best parasitism:
(a) One organism is benefited
(b) Both the organism are benefited
(c) One organism are benefited other is not affected
(d) One organism is benefited, other is affected
Answer:
(d) One organism is benefited, other is affected

Question 34.
Homo sapiens arose in:
(a) Africa
(b) Asia
(c) Europe
(d) Australia
Answer:
(b) Asia

Question 35.
Amoebiasis is caused due to:
(a) Entamoeba histolitica
(b) Plasmodium
(c) Streptococcus
(d) Wuchareia bancrofti
Answer:
(a) Entamoeba histolitica

Question 36.
Perisperm is the remained portion of:
(a) Nucleus
(b) Embryo
(c) Endosperm
(d) Integument
Answer:
(a) Nucleus

Question 37.
The process of double fertilization was discovered by
(a) Strasburger
(b) Robert Koch
(c) Nawaschin
(d) Huxley
Answer:
(c) Nawaschin

Question 38.
Which one of the following has largest population in a food-chain:
(a) Producer
(b) Primary Consumer
(c) Secondary consumer
(d) Decomposer
Answer:
(a) Producer

Question 39.
Malaria is caused due to:
(a) Protozoa
(b) Algae
(c) Fungi
(d) Malnutrition
Answer:
(a) Protozoa

Question 40.
According to Mendelism which characters are dominant:
(a) Tall plant, wrinked seed (B)
(b) Tall plant, round seed
(c) Dwarf plant, wrinkled seed
(d) Dwarf plant, round seed
Answer:
(b) Tall plant, round seed

Question 41.
The genotypic ratio in monohybrid cross is:
(a) 3 : 1
(b) 9 : 3 : 3 : 1
(c) 1 : 2 : 1
(d) None
Answer:
(c) 1 : 2 : 1

Question 42.
The term humulin is used for:
(a) A firm of chitin
(b) A digestive enzyme
(c) A powerful antibiotics
(d) human insulin
Answer:
(d) human insulin

Question 43.
Balance between CO₂ & O₂ is maintained due to:
(a) Photorespiration
(b) Respiration
(c) Photosynthesis
(d) Leaf anatomy
Answer:
(c) Photosynthesis

Question 44.
An exception of Mendel’s law is:
(a) Dominance
(b) Purity of gamete
(c) Linkage
(d) Independent assortment
Answer:
(c) Linkage

Question 45.
Lampbrush chromosomes found in the oocytes of amphibians are seen in:
(a) Leptotene
(b) Diplotene
(c) Pachytene
(d) None
Answer:
(b) Diplotene

Question 46.
The main difference between gram positive (+) and gram negative (-) bacteria lies in:
(a) Pili
(b) Cell Wall
(c) Flagella
(d) Plasmids
Answer:
(b) Cell Wall

Question 47.
In pond/forest ecosystem pyramid of energy is:
(a) Always upright
(b) always inverted
(c) Both upright & inverted
(d) Shaped
Answer:
(a) Always upright

Question 48.
What is the main contribution of Neo-Darwinians to theory of Darwinism?
(a) Photorespiration
(b) Respiration
(c) Photosynthesis
(d) Leaf anatomy
Answer:
(d) Leaf anatomy

Question 49.
Ovulation occurs under the influence of:
(a) LH
(b) FSH
(c) Estrogen
(d) Progesterone
Answer:
(a) LH

Question 50.
Number of sperms formed from one primary spermatocyte is:
(a) 8
(b) 4
(c) 3
(d) 1
Answer:
(b) 4

Question 51.
Moya’ and ‘Ratna’ are the varieties of:
(a) Rice
(b) Maize
(c) Wheat
(d) Bajra
Answer:
(a) Rice

Question 52.
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 harmed
(d) Both the species are harmed
Answer:
(c) One species is benefitted and other is harmed

Question 53.
Maximum growth rate occurs in:
(a) Lag phase
(b) Senescent phase
(c) Exponential phase
(d) Stationary phase
Answer:
(c) Exponential phase

Question 54.
Mycorrhiza show:
(a) Commensalism
(b) Amensaiism
(c) Parasitism
(d) Mutualism
Answer:
(d) Mutualism

Question 55.
Aerosols reduce primary productivity by:
(a) Decreasing O₂ concentration in atmosphere
(b) Reducing photosynthesis
(c) Competing with CO₂
(d) Being toxic to chloroplast
Answer:
(b) Reducing photosynthesis

Question 56.
Project tiger has started in India in:
(a) 1973
(b) 1985
(c) 1981
(d) 1986
Answer:
(a) 1973

Question 57.
Which of these is caused by a retrovirus?
(a) Gonorrhoea
(b) AIDS
(c) Syphilis
(d) Trichomoniasis
Answer:
(b) AIDS

Question 58.
Which one of the following has largest population in a food chain.
(a) Producers
(b) Primary Consumers
(c) Secondary Consumers
(d) Decomposers
Answer:
(a) Producers

Question 59.
‘AIDS’ is caused by:
(a) Phage virus
(b) Papiloma virus
(c) Gemini virus
(d) Retro virus
Answer:
(d) Retro virus

Question 60.
Malaria is caused by:
(a) Giardia
(b) Mycoplasma
(c) Plasmodium
(d) Salmonella
Answer:
(c) Plasmodium

Question 61.
What is the main contribution of Neo-Darwinians to the theory of Darwinism?
(a) explanation of source of variation
(b) explanation of natural selection
(c) explanation of species formation
(d) explanation of isolation
Answer:
(a) explanation of source of variation

Question 62.
Syndrome means:
(a) Diseased condition
(b) Virulency of pathogen
(c) Malignancy
(d) a group of symptoms
Answer:
(d) a group of symptoms

Question 63.
Heterozygous organism for two shall be:
(a) RRyy
(b) RrYY
(c) RrYy
(d) RRYy
Answer:
(c) RrYy

Question 64.
Crossing over takes place during:
(a) Zygotene
(b) Pachytene
(c) Diplotene
(d) Leptotene
Answer:
(b) Pachytene

Question 65.
Longitudinal binary fission is found in:
(a) Amoeba
(b) Paramecium
(c) Euglena
(d) None
Answer:
(c) Euglena

Question 66.
The flippers of penguin and dolphin show:
(a) homology
(b) Analogy
(c) both
(d) None
Answer:
(b) Analogy

Question 67.
Spermatid transforms into following number of sperms:
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(a) 2

Question 68.
The chromosome number is Doun’s syndrome is:
(a) 48
(b) 47
(c) 49
(d) 46
Answer:
(b) 47

Question 69.
Followering is the basal part of ovule:
(a) Chalaza
(b) Hilum
(c) Nucellus
(d) None
Answer:
(b) Hilum

Question 70.
Which one of the following is a sexually transmitted disease?
(a) Typhoid
(b) Syphilis
(c) Cholera
(d) Malecia
Answer:
(b) Syphilis

Question 71.
Which is not greenhouse gases?
(a) Methane
(b) CO₂ (CO₂)
(c) chlorofluorocarbon
(d) Nitrogen
Answer:
(d) Nitrogen

Question 72.
Termination codon is:
(a) UGG
(b) GUG
(C) UAG
(d) AvG
Answer:
(C) UAG

Question 73.
Eutrophication causes decrease in:
(a) Dissolved hydrogen
(b) Dissolved salts
(c) Dissolved oxygen
(d) All of these
Answer:
(c) Dissolved oxygen

Question 74.
Which RNA is used as aminoacid acceptor?
(a) m RNA (m RNA)
(b) t RNA (t RNA)
(c) hn RNA (hn RNA)
(d) r RNA (r RNA)
Answer:
(b) t RNA (t RNA)

Question 75.
PCR method is useful for:
(a) DNA synthesis
(b) DNA amplification
(c) Protein synthesis
(d) Amino acid synthesis
Answer:
(b) DNA amplification

Question 76.
Anthesis is a phenomenon which refers to:
(a) growth of pollen tube inside ovary
(b) Formation of Pollen
(c) Opening of flower bud
(d) Development of anther
Answer:
(c) Opening of flower bud

Question 77.
When breeding is between animals of the same breed it is called:
(a) Inbreeding
(b) Out breeding
(c) Out crossing
(d) Cross breeding
Answer:
(a) Inbreeding

Question 78.
Ornithophily is pollination by:
(a) Man
(b) Wind
(c) Birds
(d) Bats
Answer:
(c) Birds

Question 79.
Baker’s yeast is:
(a) S. Cerevisae
(b) S. Ludwingi
(c) S. Octosporus
(d) Shizo saaharomyces
Answer:
(a) S. Cerevisae

Question 80.
Group of bacteria used in biogas production is:
(a) Eubacteria
(b) Organotroph
(c) Methanotroph
(d) Methanogen
Answer:
(d) Methanogen

Question 81.
Which are of the following works as biofertilizer in paddy field?
(a) blue-green algae
(b) yeast
(c) fungi
(d) insect pest
Answer:
(a) blue-green algae

Question 82.
Cancer of epithelial tissue is called:
(a) Lymphoma
(b) Liposa
(c) Leukaemia
(d) Cacinoma
Answer:
(d) Cacinoma

Question 83.
Which one of the following is oviparous?
(a) Flowering plants
(b) Crocodile
(c) Woman
(d) Monkey
Answer:
(b) Crocodile

Question 84.
Seeds of fruits are transformed:
(a) Corolla
(b) Style
(c) Wall of avary
(d) Ovule
Answer:
(d) Ovule

Question 85.
Dudhwa National Park is situated in:
(a) Assam
(b) U.P.
(c) Gujarat
(d) West Bengal
Answer:
(b) U.P.

Question 86.
Replication of DNA needs:
(a) DNA Ligase
(b) DNA Polymerase
(c) DNA Polymerase and DNA Ligase
(d) Translocase and RNA Polymerase
Answer:
(c) DNA Polymerase and DNA Ligase

Question 87.
What is the position of a tiger in food chain in shown below?
(Grass → Deer → Tiger):
(a) Producer
(b) Primary Consumer
(c) Secondary Consumer
(d) Decomposer
Answer:
(c) Secondary Consumer

Question 88.
Select the statement which explains parasitism best.
(a) One organism is benefited
(b) Both the organisms are benefitted
(c) One organism is benefitted, other is not affected
(d) One organism is benefitted, other is affected.
Answer:
(d) One organism is benefitted, other is affected.

Question 89.
The second trophic level in a lake is:
(a) phytoplankton
(b) Zooplankton
(c) Benthos
(d) Fishes
Answer:
(b) Zooplankton

Question 90.
The chromosomal constitution of Klinefelter’s syndrome is:
(a) 2A + XY
(b) 2A + XO
(c) 2A + XX
(d) 2A + XXY
Answer:
(d) 2A + XXY

Question 91.
Genes which have similar genotypic effect when present separately but together interact to produce a different trait & a ratio of 9 : 7 in F2 generation are known as:
(a) Supplementary genes
(b) Complementary genes
(c) Inhibitory genes
(d) Duplicate genes
Answer:
(b) Complementary genes

Question 92.
The fact that DNA is a helix of uniform diameter was found out by:
(a) Watson & Crick
(b) Franklin
(c) Hargovind Khorana
(d) Altenburg
Answer:
(b) Franklin

Question 93.
Mycorrhiza is the example of:
(a) Mutualism
(b) Commensalism
(c) Parasitism
(d) All
Answer:
(a) Mutualism

Question 94.
The initiation codon in Translation process is:
(a) GUA
(b) AUG
(c) UGA
(d) All
Answer:
(b) AUG

Question 95.
Archaeopteryx is the connecting link between:
(a) amphibia and reptile
(b) reptile and aves
(c) Aves and mammals
(d) None
Answer:
(b) reptile and aves

Question 96.
Pyrimidine is:
(a) Adenine
(b) Guanine
(c) Uracil
(d) All
Answer:
(c) Uracil

Question 97.
Couper’s glands are found in:
(a) Human male
(b) Human female
(c) Frog
(d) Snake
Answer:
(a) Human male

Question 98.
Polar bodies are formed during:
(a) Oogenesis
(b) Spermatogenesis
(c) Gametogenesis
(d) Spermiogenesis
Answer:
(a) Oogenesis

Question 99.
Which of the following theories explain evolution on the basis of changes in gene-frequency:
(a) Neo-Lamarckism
(b) Neo-Darwinism
(c) Synthetic theory
(d) Darwinism
Answer:
(c) Synthetic theory

Question 100.
An ecosystem does not alter because it is in a state of:
(a) Homeostasis
(b) Imbalance
(c) Deficient light
(d) Deficient components
Answer:
(a) Homeostasis