By QB365 on 31 Dec, 2022
QB365 provides a detailed and simple solution for every Possible Questions in Class 12 Biology Subject - Important 1 Mark MCQ's, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
12th Standard
Biology
Answer all the following questions.
The mode of sexual reproduction in bacteria is by ______.
Formation of gametes
Endospore formation
Conjugation
Zoospore formation
The male sex hormone testosterone is secreted from _____.
Sertoli cells
Leydig cell
Epididymis
Prostate gland
The glandular accessory organ which produces the largest proportion of semen is ______.
Seminal vesicle
Bulbourethral gland
Prostate gland
Mucous gland
The milk secreted by the mammary glands soon after child birth is called ______.
Mucous
Colostrum
Lactose
Sucrose
Identify the correct statements from the following.
Chlamydiasis is a viral disease
Gonorrhoea is caused by a spirochaete bacterium, Treponema palladium
The incubation period for syphilis is 2 to 14 days in males and 7 to 21 days in females
Both syphilis and gonorrhoea are easily cured with antibiotics
Select the incorrect action of hormonal contraceptive pills from the following
Inhibition of spermatogenesis.
Inhibition of ovulation
Changes in cervical mucus impairing its ability to allow passage and transport of sperms
Alteration in uterine endometrium to make it unsuitable for implantation
ABO blood group in man is controlled by _____.
Multiple alleles
Lethal genes
Sex linked genes
Y-linked genes
What can be the blood group of offspring when both parents have AB blood group?
AB only
A, B and AB
A, B, AB and O
A and B only
Hershey and Chase experiment with bacteriophage showed that ______.
Protein gets into the bacterial cells
DNA is the genetic material
DNA contains radioactive sulphur
Viruses undergo transformation
E. coli cell grown on 15N medium are transferred to 14N medium and allowed to grow for two generations. DNA extracted from these cells is ultracentrifuged in a cesium chloride density gradient. What density distribution of DNA would you expect in this experiment?
One high and one low density band
One intermediate density band.
One high and one intermediate density band.
One low and one intermediate density band
Which of the following was the contribution of Hugo de Vries?
Theory of mutation
Theory of natural Selection
Theory of inheritance of acquired characters
Germplasm theory
Which period was called “Age of fishes”?
Permian
Triassic
Devonian
Ordovician
Amphetamines are stimulants of the CNS, whereas barbiturates are ______
CNS stimulant
both a and b
hallucinogenic
CNS depressants
Allergy involves
IgE
IgG
lgA
IgM
Cyclosporin – A is an immunosuppressive drug produced from _______
Aspergillus niger
Manascus purpureus
Penicillium notatum
Trichoderma polysporum
The gases produced in anaerobic sludge digesters are
Methane, oxygen and hydrogen sulphide
Hydrogen sulphide, methane and sulphur dioxide
Hydrogen sulphide, nitrogen and methane
Methane, hydrogen sulphide and CO2.
The genetic defect adenosine deaminase deficiency may be cured permanently by
Enzyme replacement therapy
periodic infusion of genetically engineered lymphocytes having ADA cDNA
administering adenosine deaminase activators
introducing bone marrow cells producing ADA into embryo at an early stage of development.
Transgenic animals are those which have
Foreign DNA in some of their cells
Foreign DNA in all their cells
Foreign RNA in some of their cells
Foreign RNA in all their cells
Predation and parasitism are which type of interactions?
(+,+)
(+, O)
(--, --)
(+, --)
The organization which published the red list of species is
WWF
IUCN
ZSI
UNEP
Assertion(A): The Environmental conditions of the tropics are favourable for speciation and diversity of organisms.
Reason(R): The climate seasons, temperature, humidity and photoperiod are more or less stable and congenial.
Both Assertion and Reason are true and Reason explains Assertion correctly.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Assertion is true, but Reason is false.
Both Assertion and Reason are false.
SMOG is derived from:
Smoke
Fog
Both (a) and (b)
Only A
Pollen tube was discovered by ______.
J.G.Kolreuter
G.B.Amici
E.Strasburger
E.Hanning
Which one of the following is an example of polygenic inheritance?
Flower colour in Mirabilis Jalapa
Production of male honey bee
Pod shape in garden pea
Skin Colour in humans
An allohexaploidy contains ______.
Six different genomes
Six copies of three different genomes
Two copies of three different genomes
Six copies of one genome
pBR 322, BR stands for ______.
Plasmid Bacterial Recombination
Plasmid Bacterial Replication
Plasmid Boliver and Rodriguez
Plasmid Baltimore and Rodriguez
Micro propagation involves _____.
vegetative multiplication of plants by using micro-organisms.
vegetative multiplication of plants by using small explants.
vegetative multiplication of plants by using microspores.
Non-vegetative multiplication of plants by using microspores and megaspores.
Cryopreservation means it is a process to preserve plant cells, tissues or organs _____.
at very low temperature by using ether.
at very high temperature by using liquid nitrogen
at very low temperature of -196°C by using liquid nitrogen
at very low temperature by using liquid nitrogen
Which of the given plant produces cardiac glycosides?
Calotropis
Acacia
Nepenthes
Utricularia
Which of the following plant has a non-succulent xerophytic and thick leathery leaves with waxy coating
Bryophyllum
Ruscus
Nerium
Calotropis
Profundal zone is predominated by heterotrophs in a pond ecosystem, because of ______.
with effective light penetration
no effective light penetration
complete absence of light
a and b
Which of the following are not regulating services of ecosystem services
i) Genetic resources
ii) Recreation and aesthetic values
iii) Invasion resistance
iv) Climatic regulation
i and iii
ii and iv
i and ii
i and iv
Which of the following would most likely help to slow down the greenhouse effect.
Converting tropical forests into grazing land for cattle.
Ensuring that all excess paper packaging is buried to ashes.
Redesigning landfill dumps to allow methane to be collected.
Promoting the use of private rather than public transport.
Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancer?
Ammonia
Methane
Nitrous oxide
Ozone
Match Column I with Column II
Column I | Column II |
i) William S. Gaud | I) Heterosis |
ii) Shull | II) Mutation breeding |
iii) Cotton Mather | III) Green revolution |
iv) Muller and Stadler | IV) Natural hybridization |
i | ii | iii | iv |
I | II | III | IV |
i | ii | iii | iv |
III | I | IV | II |
i | ii | iii | iv |
IV | II | I | IV |
i | ii | iii | iv |
II | IV | III | I |
Match column I (crop) with column II (Corresponding disease resistant variety) and select the correct option from the given codes.
Column I | Column II |
I) Cowpea | i) Himgiri |
II) Wheat | ii) Pusa komal |
III) Chilli | iii) Pusa Sadabahar |
IV) Brassica | iv) Pusa Swarnim |
I | II | III | IV |
iv | iii | ii | i |
I | II | III | IV |
ii | i | iii | iv |
I | II | III | IV |
ii | iv | i | iii |
I | II | III | IV |
i | iii | iv | ii |
Assertion: Vegetables are important part of healthy eating.
Reason: Vegetables are succulent structures of plants with pleasant aroma and flavours.
Assertion is correct, Reason is wrong
Assertion is wrong, Reason is correct
Both are correct and reason is the correct explanation for assertion.
Both are correct and reason is not the correct explanation for assertion.
Find out the correctly matched pair.
Rubber-Shorea robusta
Dye-Lawsonia inermis
Timber-Cyperus papyrus
Pulp-Hevea brasiliensis
Anaphylactic shock is due to
Allergic reaction
Secretion of toxins
Secretion of histamines
All the above
B cells that produce and release large amounts of antibody are called
Memory cells
Basophils
Plasma cells
killer cells
Multiple fission is seen in _______
Vorticella and ceratium
Plasmodium and paramecium
Amoeba and cyanobacteria
Vorticella and plasmodium
This technique is used to diagnose the chromosomal abnormities.
Assisted Reproductive Technology (ART)
Micro Testicular Sperm Extraction
Amniocentesis
GIFT
Height in humans is
Somatagenic variation
Discontinuous variation
Continuous variation
Both B and C
DB is a standard abbreviation used for the quantitative expression of
The density of bacteria in a medium
A particular pollutant
The dominant bacillus in a culture
A certain pesticide
A scrubber in the exhaust of a chemical industrial plant removes
Gases like sulphur dioxide.
Particulate matter of the size 5 micrometer or above.
Gases like ozone and methane
Particulate matter of the size 2.5 micrometer or less
An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is
camdylotropous
anatropous
orthotropous
hemianatropous
In order to calculate map distance of genes on a chromosome, this has to be considered
Number of mutant genes
Cross over percentage
Recombination frequency of each gene locus
Non cross over percentage
_____________ technique helps in identification of transformed cells in culture media.
Blue white colony selection
Antibiotic resistant markers
Replica plating
Agarose gel electrophoresis
If we uncover half of the forest covering the earth, what crisis will be produced at most and the first?
Some species will be extinct
Population and ecological imbalance will rise up
Energy crisis will occur
Rest half forests will maintain this imbalance
Which plant in cultivated for about 7,500 years?
Oryza sativa
Triticum aestivum
Secale cerale
Chenopodium
Answers
Conjugation
Leydig cell
Seminal vesicle
Colostrum
Both syphilis and gonorrhoea are easily cured with antibiotics
Inhibition of spermatogenesis.
Multiple alleles
A, B and AB
DNA is the genetic material
One low and one intermediate density band
Theory of mutation
Devonian
CNS depressants
IgE
Trichoderma polysporum
Methane, hydrogen sulphide and CO2.
Enzyme replacement therapy
Foreign DNA in all their cells
(+, --)
IUCN
Both Assertion and Reason are true and Reason explains Assertion correctly.
Both (a) and (b)
G.B.Amici
Skin Colour in humans
Two copies of three different genomes
Plasmid Boliver and Rodriguez
vegetative multiplication of plants by using small explants.
at very low temperature of -196°C by using liquid nitrogen
Calotropis
Nerium
no effective light penetration
i and ii
Redesigning landfill dumps to allow methane to be collected.
Ozone
i | ii | iii | iv |
III | I | IV | II |
I | II | III | IV |
ii | i | iii | iv |
Assertion is correct, Reason is wrong
Dye-Lawsonia inermis
All the above
Plasma cells
Vorticella and plasmodium
Amniocentesis
Continuous variation
A particular pollutant
Gases like sulphur dioxide.
hemianatropous
Cross over percentage
Replica plating
Some species will be extinct
Triticum aestivum