Bihar Board 12th Biology Important Questions Objective Type Part 7 are the best resource for students which helps in revision.
Bihar Board 12th Biology Objective Important Questions Part 7
Question 1.
Of the 23 pairs of chromosomes in human cells, how many are autosomes in man & woman?
(a) 23 pairs
(b) 22 pairs
(c) 20 pairs
(d) one pair
Answer:
(b) 22 pairs
Question 2.
Common cold is caused by:
(a) Retrovirus
(b) Phage virus
(c) Rhinovirus
(d) Sendai virus
Answer:
(c) Rhinovirus
Question 3.
Common cold is:
(a) Contagious disease
(b) Infectious disease
(c) non-contagious disease
(d) Quarantine disease
Answer:
(b) Infectious disease
Question 4.
Common cold is spread by:
(a) droplets resulting from sneezes
(b) contaminated objects
(c) contaminated mouse of computer
(d) All of above
Answer:
(d) All of above
Question 5.
“Personal hygine” stands for:
(a) Balanced diet
(b) To keep one self neat & clean
(c) Taking exercise
(d) To maintain good health
Answer:
(c) Taking exercise
Question 6.
Control of vectors can be achieved by:
(a) immunisation
(b) to take regular exercise
(c) by proper disposal of wastes & taking contamination free food
(d) to make aware about disease
Answer:
(c) by proper disposal of wastes & taking contamination free food
Question 7.
Balanced diet is one which contains:
(a) high protein
(b) enriched with minerals
(c) contains all the nutrients in proportion
(d) can be digested easily
Answer:
(c) contains all the nutrients in proportion
Question 8.
In Salvia, pollinating agents are insects. Such pollination is known as:
(a) anemophily
(b) hydrophily
(c) zoophily
(d) entomophily
Answer:
(d) entomophily
Question 9.
Some flowers which never open are called as
(a) protandrous
(b) unisexual
(c) cleistogamous
(d) chasmogamous
Answer:
(c) cleistogamous
Question 10.
The transfer of pollen grains from anther to stigma is known as:
(a) dichogamy
(b) fertilisation
(c) syngamy
(d) pollination
Answer:
(d) pollination
Question 11.
Which part of ovary degenerates during parturition?
(a) Grafian follicle
(b) Corpus luteum
(c) Corpus albicans
(d) Sertoli cells
Answer:
(b) Corpus luteum
Question 12.
An enzyme used to cut DNA.
(a) Pectinase
(b) Ligase
(c) Restriction endonuclease
(d) Lysozyme
Answer:
(c) Restriction endonuclease
Question 13.
The theory of Origin of Species by natural selection was proposed by:
(a) Charles Darwin
(b) Lamarck
(c) Ernst Haeckel
(d) Malthus
Answer:
(a) Charles Darwin
Question 14.
In which of following fertilization is internal:
(a) Fish
(b) Amphibians
(c) Major of algae
(d) Angiosperm
Answer:
(d) Angiosperm
Question 15.
Which one of the following would represents allotrploid:
(a) AAABB
(b) AAAA
(c) AABB
(d) BBBB
Answer:
(a) AAABB
Question 16.
In an ovule meiotic division takes place in
(a) Nucellus
(b) Megaspore mother cell
(c) Megaspore
(d) Archesporium.
Answer:
(b) Megaspore mother cell
Question 17.
Which one is the female gametophyte?
(a) Embryo
(b) Egg
(c) Embryo sac
(d) Antipodal cell
Answer:
(c) Embryo sac
Question 18.
The last past of the oviduct is called
(a) Isthmus
(b) Ampulla
(c) Fibriae
(d) Infundibulum
Answer:
(a) Isthmus
Question 19.
The opening of the vagina is often covered partially by a membrane called
(a) Clitoris
(b) Hymen
(c) Majora
(d) Minora
Answer:
(b) Hymen
Question 20.
Ovulation regulate by which hormone?
(a) TSH
(b) ACTH
(c) FAH & LH
(d) Progesteron
Answer:
(c) FAH & LH
Question 21.
Corpus luteum secretes
(a) Insulin
(b) Progesterone
(c) Gastrin
(d) Secretin
Answer:
(b) Progesterone
Question 22.
The Pre-natal technique to determine the genetic disorders in a foetus is called
(a) Laproscopy
(b) Amniocentesis
(c) Abstinence
(d) Coitus interrupts
Answer:
(b) Amniocentesis
Question 23.
Which one of these is caused by a retrovirus?
(a) Gonorrhoea
(b) syphillis
(c) AIDS
(d) Trichomoniasis
Answer:
(c) AIDS
Question 24.
Family Planning Programme was invented in
(a) 1920
(b) 1930
(c) 1950
(d) 1951
Answer:
(d) 1951
Question 25.
The method of directly injecting a sperm into ovum is assisted by reproductive technology is called?
(a) GFT
(b) ZIFT
(c) ICSI
(d) ET
Answer:
(c) ICSI
Question 26.
The phenotypic ratio in a dihybrid cross is
(a) 3 : 1
(b) 1 : 2 : 1
(c) 9 : 7
(d) 9 : 3 : 3 : 1
Answer:
(d) 9 : 3 : 3 : 1
Question 27.
Blood of which group can be given to a patient of any blood group
(a) O
(b) A
(c) B
(d) AB
Answer:
(a) O
Question 28.
When a red skinned animal is crossed with white skinned animal then roar cloared animal produced in F1 geneation. This shows
(a) Incomplete dominance
(b) Complete dominance
(c) Co-dominance
(d) Linkage.
Answer:
(c) Co-dominance
Question 29.
The enzyme involved in transcription is
(a) DNA Polymerase I
(b) DNA Polymerase II
(c) RNA Polymerase
(d) DNA Polymerase III
Answer:
(c) RNA Polymerase
Question 30.
Which one is mainly transcribed?
(a) Only RNA sequence
(b) Middle repetitive DNA sequence
(c) Highly repetitive
(d) Single copy of DNA sequence
Answer:
(d) Single copy of DNA sequence
Question 31.
One of these is not directly prepared from DNA
(a) m-RNA
(b) t-RNA
(c) r-RNA
(d) Protein
Answer:
(d) Protein
Question 32.
Circular DNA is found in
(a) Mitochondria
(b) Virus
(c) amoeba
(d) Bacteria
Answer:
(a) Mitochondria
Question 33.
DNA Fingerprinting is
(a) DNA typing
(b) DNA profiling
(c) both a and b
(d) Base pairing
Answer:
(b) DNA profiling
Question 34.
Echidna is
(a) Connecting link
(b) Vestigial organ
(c) Extinct link
(d) None of these
Answer:
(a) Connecting link
Question 35.
An allergic reaction is initiated by which group of antibodies
(a) IgG
(b) IgA
(c) IgF
(d) IgM
Answer:
(c) IgF
Question 36.
Passive immunity can be obtained by injecting
(a) Antibodies
(b) Antigens
(c) Antibiotics
(d) Vaccination
Answer:
(a) Antibodies
Question 37.
Filaria disease develops by Wuchereria bancrofti. It is of which group
(a) protozoa
(b) Bacteria
(c) Virus
(d) Helminth
Answer:
(d) Helminth
Question 38.
The infective stage of Plasmodium to man is
(a) Gametocyte
(b) Sporozoite
(c) Merozoite
(d) Cryptozoite
Answer:
(b) sporozoite
Question 39.
Most nutritious among the following is
(a) Wheat
(b) Maize
(c) Barley
(d) Rice
Answer:
(c) Barley
Question 40.
The technique of obtaining large number of plantlets by tissue culture method is called
(a) Organ culture
(b) Micro-propagation
(c) Macro-propagation
(d) Plantlet culture
Answer:
(b) Micro-propagation
Question 41.
The best milk breed in the world is
(a) Chittagong
(b) Deoni
(c) Holstein-Friesian
(d) Sindhi
Answer:
(c) Holstein-Friesian
Question 42.
Honey is made by
(a) Male honey bee
(b) Queen honey bee
(c) Worker honey bee
(d) Both a and b
Answer:
(c) worker honey bee
Question 43.
Restriction enzymes are
(a) Exonuclease
(b) Endonuclease
(c) ligase
(d) polymerase
Answer:
(b) Endonuclease
Question 44.
Bacteria has
(a) Plasmid DNA
(b) RNA
(c) Both a and b
(d) none of these
Answer:
(c) Both a and b
Question 45.
PCR Cycle completes into
(a) Denaturation
(b) Annealing
(c) Extension
(d) All of these
Answer:
(d) All of these
Question 46.
Gene gun is used to
(a) Cut the plasmid
(b) Bind the cut DNA
(c) Introduction of alien DNA into host cell
(d) Purify DNA
Answer:
(c) Introduction of alien DNA into host cell
Question 47.
The maximum growth rate occurs in
(a) Lag phase
(b) Exponential phase
(c) Stationary phase
(d) Senescent phase
Answer:
(b) Exponential phase
Question 48.
Animals undergo inactive state during winters. It is called
(a) Acclimatisation
(b) Hibernation
(c) Aestivation
(d) Adaptation
Answer:
(b) Hibernation
Question 49.
Ecotone is
(a) A polluted area
(b) The bottom of a lake
(c) A zone of transition between two communities
(d) A zone of developing community
Answer:
(c) A zone of transition between two communities
Question 50.
Red Data Book is produced by
(a) IUCN
(b) WWF
(c) IBWL
(d) None of these
Answer:
(a) IUCN
Question 51.
The study of rearing honey bees and production of honey is known as
(a) Sericulture
(b) Apiculture
(c) Lac Culture
(d) Pisciculture
Answer:
(b) Apiculture
Question 52.
The study of rearing silkworm of production of silk thread is called
(a) Apiculture
(b) Lack culture
(c) Sericulture
(d) Poultry
Answer:
(c) Sericulture
Question 53.
Nuclear membrane is absent in
(a) Monera
(b) Fungi
(c) Plantae
(d) Protista
Answer:
(d) Protista
Question 54.
Central cell of embryo sac is
(a) Primary nucleus
(b) Secondary nucleus
(c) Synergial
(d) Both a and b
Answer:
(b) Secondary nucleus