Bihar Board 12th Biology Important Questions Objective Type Part 3 are the best resource for students which helps in revision.
Bihar Board 12th Biology Objective Important Questions Part 3
Question 1.
The loss of one chromosomes creates a condition called:
(a) Trisomy
(b) Nullisomy
(c) Monosomy
(d) Haploid
Answer:
(c) Monosomy
Question 2.
Lampbrush chromosomes are seen during:
(a) Mitotic prophase
(b) Meiotic prophase
(c) Mitotic metaphase
(d) Meiotic metaphase
Answer:
(b) Meiotic prophase
Question 3.
Balbiani rings are the structural features of:
(a) Autosomes
(b) Allosomes
(c) Polytene chromosomes
(d) Lamp brush chromosomes
Answer:
(c) Polytene chromosomes
Question 4.
If independent assortment of two genes A & B is lacking in Drosophila. This is due to:
(a) Linkage
(b) Repulsion
(c) Crossing over
(d) Recombination
Answer:
(a) Linkage
Question 5.
Antigens may be large molecules of:
(a) Proteins
(b) Carbohydrates
(c) Lipoproteins
(d) All of the above
Answer:
(d) All of the above
Question 6.
Humoral immune system comprises:
(a) B-lymphocytes
(b) T-lymphocytes
(c) Blood
(d) Monocytes
Answer:
(a) B-lymphocytes
Question 7.
Antibodies in our body produced by:
(a) Monocytes
(b) RBCs
(c) B-Lymphocytes
(d) T-Lymphocytes
Answer:
(c) B-Lymphocytes
Question 8.
Which one is the most numerous and long-acting antibody?
(a) IgA
(b) IgG
(c) IgM
(d) IgE
Answer:
(b) IgG
Question 9.
In colostrum which antibody is present?
(a) IgA
(b) IgG
(c) IgD
(d) IgE
Answer:
(a) IgA
Question 10.
Vaccination against small pox was developed by:
(a) Robert Koch
(b) Louis pasteur
(c) Edward Jenner
(d) Alexander Flemming
Answer:
(c) Edward Jenner
Question 11.
Which one is sexually transmitted disease?
(a) Syphilis
(b) Genital herpes
(c) Trichomoniasis
(d) All of these
Answer:
(d) All of these
Question 12.
BCG (Bacille calmetle guorin) is a vaccine that is used for preventation of:
(a) Polio
(b) Tuberculosis
(c) Tetanus
(d) Leprosy
Answer:
(b) Tuberculosis
Question 13.
Tetanus is a dangerous disease of human which Is caused by:
(a) Clestridium botulinum
(b) Clastridium tetani
(c) Corynebacterium diphtherae
(d) Bordetella pertusis
Answer:
(b) Clastridium tetani
Question 14.
Lung cancer is known as:
(a) Carcinoma
(b) Sarcoma
(c) Melanoma
(d) Glioma
Answer:
(a) Carcinoma
Question 15.
Cerebral malaria is caused bv Plasmodium:
(a) Vivax
(b) Ovale
(c) Malariae
(d) Falciparum
Answer:
(d) Falciparum
Question 16.
Diabetes mellitus is characterized by:
(a) Hypoglycemia
(b) Hyperglycemia
(c) Hypercalcemia
(d) Hypocalcemia
Answer:
(b) Hyperglycemia
Question 17.
Hydrophobia (Rabies) is a disease caused by:
(a) Nematode
(b) Virus
(c) Bacteria
(d) Protozoan
Answer:
(b) Virus
Question 18.
A water borne disease is:
(a) Small pox
(b) Malaria
(c) Tuberculosis
(d) Cholera
Answer:
(d) Cholera
Question 19.
Leprosy is caused by:
(a) Bacillus
(b) Mycobacterium
(c) Vibrio
(d) Salmonella
Answer:
(b) Mycobacterium
Question 20.
Cancer producing genes are:
(a) Tumour genes
(b) Oncogenes
(c) Cancer genes
(d) Regulator genes
Answer:
(b) Oncogenes
Question 21.
Which one of the followings is an opiate nartotic?
(a) Barbiturate
(b) LSD
(c) Moiphine
(d) Amphetamines
Answer:
(c) Moiphine
Question 22.
Sleeping pills are made from:
(a) LSD
(b) Cocaine
(c) Barbiturates
(d) Amphetamines
Answer:
(c) Barbiturates
Question 23.
Cirrhosis is caused by taking:
(a) LSD
(b) Alcohol
(c) Opium
(d) Heroin
Answer:
(b) Alcohol
Question 24.
Anti-Tobacco Day is celebrated on:
(a) May 31
(b) April 22
(c) December 1
(d) June 27
Answer:
(a) May 31
Question 25.
Which of the following are haliucino gens?
(a) Charas
(b) Ganja
(c) Bhang
(d) All of these
Answer:
(d) All of these
Question 26.
Hallucinogens are:
(a)
(b) Marijuana
(c) LSD
(d) All of these
Answer:
(d) All of these
Question 27.
Which part of brain is most affected by alcohol?
(a) Cerebrum
(b) cerebellum
(c) Medulla oblongata
(d) Pens varotii
Answer:
(b) cerebellum
Question 28.
Which one is a synthetic drug?
(a) Opium
(b) LSD
(c) Barbiturates
(d) Cocaine
Answer:
(c) Barbiturates
Question 29.
Sedative may produce a feeling of:
(a) Relaxation
(b) Calmness
(c) Drowsiness
(d) All of these
Answer:
(d) All of these
Question 30.
Restriction endonucleases are widely used in recombinant DNA technology. They are obtained from:
(a) Bacteriophages
(b) Plasmids
(c) Bacterial cells
(d) All prokaryotic cells
Answer:
(c) Bacterial cells
Question 31.
Plasmids are:
(a) c-DNA
(b) Mitochondrial DNA
(c) Circular extrachromosomal DNA in Bacteria
(d) Viral RNA
Answer:
(c) Circular extrachromosomal DNA in Bacteria
Question 32.
Transgenic plants are developed by:
(a) clone and genetically modified genes
(b) Introduction of foreign genes
(c) genetic engineering
(d) Purified genes
Answer:
(b) Introduction of foreign genes
Question 33.
Molecular scissors which cut DNA at specific site is:
(a) Pectinase
(b) Polymerase
(c) Restriction endonuclease
(d) Ligase
Answer:
(c) Restriction endonuclease
Question 34.
There is a restriction endonuclease “ECORI’. What does ‘Co’ part in it stand for?
(a) colon
(b) coelom
(c) coenzyme
(d) coli
Answer:
(d) coli
Question 35.
Which of the following is used in gene cloning?
(a) Nucleoids
(b) Mesosomes
(c) Lomasomes
(d) Plasmids
Answer:
(d) Plasmids
Question 36.
Agarose extracted from seaweeds is used in:
(a) Spectrophotometry
(b) Tissue culture
(c) PCR
(d) Gel electrophoresis
Answer:
(d) Gel electrophoresis
Question 37.
Which one is Palindromic, base sequence in DNA?
Answer:
(d) 5’ GAATTC 3’
3’ CTTAAG 5’
Question 38.
Nucleic acids within the polynucleotide chain is cut by which enzyme?
(a) Endonuclease
(b) Exonuclease
(c) Arysulfatase
(d) Restriction
Answer:
(a) Endonuclease
Question 39.
Restriction enzyme functions as to:
(a) cut the DNA at specific site
(b) Join the cut ends
(c) cut DNA at the ends
(d) cut RNA at specific site
Answer:
(a) cut the DNA at specific site
Question 40.
The cut DNA joined to another cut DNA by which enzyme?
(a) Ligase
(b) Polymerase I
(c) Polymerase II
(d) Helicases
Answer:
(a) Ligase
Question 41.
Bt gene is isolated from:
(a) Bacteria
(b) viruses
(c) Protozoans
(d) Nematodes
Answer:
(a) Bacteria
Question 42.
Bt gene is introduced in cotton plant for protection against:
(a) Protozoans
(b) Nematodes
(c) Insects
(d) Viruses
Answer:
(c) Insects
Question 43.
Which one of the followings is used in industrial preparation of ethanol:
(a) Azotobacter
(b) Lactobacillus
(c) Saccharomyces
(d) Penicillium
Answer:
(c) Saccharomyces
Question 44.
Genetically engineered bacteria are being utilized for production of:
(a) Thyroxine
(b) Cortisol
(c) Human insulin
(d) Epinephrine
Answer:
(c) Human insulin
Question 45.
Antibiotics are mostly obtained from:
(a) Bacteria
(b) Fungi
(c) Viruses
(d) Angiosperms
Answer:
(a) Bacteria
Question 46.
Antibiotics are:
(a) Toxins
(b) Drugs
(c) Syrup
(d) plants
Answer:
(b) Drugs
Question 47.
T-lymphocytes originates from:
(a) Liver
(b) Thymus
(c) Bone marrow
(d) None of these
Answer:
(b) Thymus
Question 48.
Interferons are anti:
(a) viral proteins
(b) Bacterial proteins
(c) Cancer proteins
(d) nucleoproteins
Answer:
(a) viral proteins
Question 49.
Pyramid of energy in a pond ecosystem is always:
(a) Linear
(b) Inverted
(c) Upright
(d) Irregular
Answer:
(c) Upright
Question 50.
Energy transferred from one trophic level to another is:
(a) 5%
(b) 10%
(c) 15%
(d) 20%
Answer:
(b) 10%