MCQ Questions for Class 12 Biology Quiz with Answers Chapter Wise PDF Download

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Class 12 Biology MCQs Multiple Choice Questions with Answers

Here are the chapterwise CBSE MCQ Quiz Test Questions for Class 12th Biology in pdf format that helps you access & download so that you can practice online/offline easily.

Biodiversity And Its Conservation Class 12 Medical Biology MCQ Quiz

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Biodiversity And Its Conservation Questions and Answers

Biodiversity And Its Conservation Quiz Question Answer
Which is the national aquatic animal of India?
 River dolphin
Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to
 Keoladeo Ghana National Park
Select the correct statement about biodiversity. Western Ghats have a very high degree of species richness and endemism.
Which one of the following is not used for ex situ plant conservation?
 Shifting cultivation
How many hot spots of biodiversity in the world have been identified till date by Norman Myers? 34
Cryopreservation of gametes of threatened species in viable and fertile condition can be referred to as Advanced ex-situ conservation of biodiversity.
Which one of the following is a characteristic feature of cropland  ecosystem?
 Least genetic diversity
Which of the following National Parks is home to the famous musk deer or Hangul?  Dachigam National Park, Jammu and Kashmir
In which of the following both pairs have correct combination? In situ conservation : National Park

Ex situ conservation : Botanical Garden
Which one of the following is related to Ex-situ conversation of threatened animals and plants? Wildlife Safari parks

Biotechnology And Its Applications Class 12 Medical Biology MCQ Quiz

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Biotechnology And Its Applications Questions and Answers

Biotechnology And Its Applications Quiz Question Answer
Use of bioresources by multinational companies and organisations without authorization from the concerned country and its people is called: Biopiracy
Which body of the Government of India regulates GM research and safety of introducing GM organisms for public services? Genetic Engineering Approval Committee
Which of the following are not an invention and should not be patented? All of the above
Which of the following is not a principal patenting pirate? India

The illegal and unlawful development of bio materials without payment to the inhabitants of their origin is called as

 Biopiracy

Some multinational companies patent biological sample of other country without permission is called as

 Biopiracy

Biopiracy of Indian plant by USA is

 Mustard
Why is umbilical cord preserved after the birth? It is a source of stem cells.
TRIPS states that ___________. Patents shall be available for any inventions, whether products or processes, in all fields of technology, provided that they are new, involve an inventive step and are capable of industrial application
In autologous stem cell transplant, the stem cells are obtained  From the individual itself.

Biotechnology: Principles And Processes Class 12 Medical Biology MCQ Quiz

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Biotechnology: Principles And Processes Questions and Answers

Biotechnology: Principles And Processes Quiz Question Answer
Which of the following enzyme's other name is knife of DNA? Restriction endonuclease
Biolistics (gene-gun) is suitable for Transformation of plant cells.
In genetic engineering, a DNA segment (gene) of interest, is transferred to the host cell through a vector. Consider the following four agents (A-D) in this regard and select the correct option about which one or more of these can be used as a vector/vectors.
(A) A bacterium 
(B) Plasmid 
(C) Plasmodium 
(D) Bacteriophage 
 (B) and (D) only
The given figure shows three steps (A, B, C) of Polymerase Chain Reaction (PCR). Select the option giving correct identification together with what it represents?
306836.png		 C- Extension in the presence of heat stable DNA polymerase
Which one of the following is wrong?
(A) The first transgenic cow Rosie, produced milk which was human alpha-lactalbumin enriched.
(B) Restriction enzymes are used in isolation of DNA from other macro-molecules.
(C) Downstream processing is one of the steps of R-DNA technology.
(D) Disarmed pathogen vectors are also used in transfer of R-DNA into the host.

 Statement (B) only
In which of these vectors the size of the DNA that can be cloned is the smallest?
 Plasmid
An analysis of chromosomal DNA using the southern hybrization technique does not use
 PCR
Which one of the following represents a palindromic sequence in DNA? 5' GAATTC 3'

3' CTTAAG 5'
The cutting of DNA at specific locations became possible with the discovery of
 Restriction enzymes
Plasmid has been used as vector because All of the above.

Ecosystem Class 12 Medical Biology MCQ Quiz

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Ecosystem Questions and Answers

Ecosystem Quiz Question Answer
In an ecosystem, the rate of production of organic matter during photosynthesis is termed as Gross primary productivity.
Given above is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.

312232.png		 A- Detritus, B- Rock minerals, C- Producers, D- Litter fall
Secondary succession takes place on/in Degraded forest.
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct? Gross primary productivity is always more than Net primary productivity.
The rate of formation of new organic matter by rabbit in a grassland is called Secondary productivity
In which of the following, both pairs have correct combination? Gaseous nutrient cycle-Carbon and nitrogen, Sedimentary nutrient cycle- Sulphur and Phosphorus
Which of the following representations shows the pyramid of number in a forest ecosystem?
306739_7f868dc481034601b19f6c1c1bdf17a3.png		 C A
Which of the following ecological pyramids is generally inverted? Pyramid of biomass in a sea
The second stage of hydrosere is occupied by plants like Vallisneria
During ecological succession The gradual and predictable change in species composition occurs in a given area.

Environmental Issues Class 12 Medical Biology MCQ Quiz

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Environmental Issues Questions and Answers

Environmental Issues Quiz Question Answer
Which of these following methods is the most suitable for disposal of nuclear waste? Bury the waste within rocks deep below the Earth's surface
Depletion of which gas in the atmosphere can lead to an increase incidence of skin cancers? Ozone
When domestic sewage mixes with river water  The increased microbial activity uses up dissolved oxygen.
Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from Petroleum industry
High value of BOD (Biochemical Oxygen Demand) indicates  Consumption of organic matter in the water is higher by the microbes
World ozone day is celebrated on __________ $$16^{th}$$ September
Ozone in stratosphere extends 20-25km
The stratospheric ozone depletion leads to? All of the above
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Biological Oxygen Demand (BOD) is a measure of  Extent to which water is polluted with organic compound

Evolution Class 12 Medical Biology MCQ Quiz

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Evolution Questions and Answers

Evolution Quiz Question Answer
Match the hominids with their correct brain size.

a) Homo habilis(i) $$900$$ cc
b) Homo neanderthalensis(ii) $$1350$$ cc
c) Homo erectus(iii) $$650-800$$ cc
d) Homo sapiens(iv) $$1400$$ cc

Select the correct option.
 a)-(iii), b)-(iv), c)-(i), d)-(ii)
The process by which organism with different evolutionary history evolve similar phenotypic adaptations in response to a common environmental challenge, is called Convergent evolution.
The chronological order of human evolution from early to the recent is Ramapithecus $$\rightarrow$$ Australopithceus $$\rightarrow$$ Homo habilis $$\rightarrow$$ Homo erectus
The tendency of population to remain in genetic equilibrium may be disturbed by _________. Lack of random mating
The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function. This is an example of
 Analogous organs that have evolved due to convergent evolution.
Homo sapiens implies Modern man
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Which of the following was the transitional stage (connective link) between apes and humans? Australopithecus ramidus
Wings of pigeon, mosquito and bat shows  Convergent evolution
Tendrils in plants are an example of
 Convergent evolution

Human Health And Disease Class 12 Medical Biology MCQ Quiz

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Human Health And Disease Questions and Answers

Human Health And Disease Quiz Question Answer
Tobacco smoke contains carbon monoxide, which Reduces the oxygen-carrying capacity of blood
In higher vertebrates, the immune system can distinguish self-cells and non-self. If the property is lost due to genetic abnormality and it attacks self-cells, then it leads to ?
 Auto-immune disease.
Which of the following is not an autoimmune disease ? Alzheimer's disease
Which of the following is correct regarding AIDS causative agent HIV? HIV is enveloped virus that contains two identical molecules of single-stranded RNA and two molecules of reverse transcription.
HIV is a member of a group of viruses called 
 Retroviruses
Human Immuno Virus (HIV) contains a protein coat, genetic material and has a horse chestnut shaped  Single-stranded RNA.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Assertion : Cancer is contagious and cells can spread from one person to other.

Reason : Cancerous cells are highly differentiated cells

 If the assertion and reason both are false.
Short-lived immunity acquired from mother to foetus across placenta or through mother's milk to the infant is categorised as  Passive immunity
Which of the following is correct regarding HIV, hepatitis B, gonorrhoea, trichomoniasis? HIV is a pathogen whereas others are diseases.

Human Reproduction Class 12 Medical Biology MCQ Quiz

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Human Reproduction Questions and Answers

Human Reproduction Quiz Question Answer
About which day in a normal menstrual cycle does rapid secretion of LH (popularly called LH-surge) normally occurs? $${14}^{th}$$ day
Which of the following depicts the correct pathway of transport of sperms? Rete testis $$\rightarrow$$ efferent ductules $$\rightarrow$$ epididymis $$\rightarrow$$ vas deferens
Secretions from which one of the following are rich in fructose, calcium and some enzymes? Male accessory glands
Select the correct sequence for transport of sperm cells in male reproductive system. Seminiferous tubules $$\rightarrow$$ Rete testis $$\rightarrow$$ Vasa efferentia $$\rightarrow$$ Epididymis $$\rightarrow$$ Vas deferens $$\rightarrow$$ Ejaculatory duct $$\rightarrow$$ Urethra $$\rightarrow$$ Urethral meatus
Which of the following cells during gametogenesis is normally diploid? Spermatogonia
The secretory phase in the human menstrual cycle is also called Luteal phase and lasts for about 13 days
Cessation of menstrual cycle in the human female is known as  Menopause
Study of abnormal embryonic growth comes under Teratology
During the fourth and sixth cleavage of the zygote  Mocromeres give rise to ectoderm
In humans at the end of first meiotic division, the male germ cells differentiate into 
 Secondary spermatocytes

Microbes In Human Welfare Class 12 Medical Biology MCQ Quiz

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Microbes In Human Welfare Questions and Answers

Microbes In Human Welfare Quiz Question Answer
During sewage treatment, gases produced include Methane, hydrogen sulphide, carbon dioxide and hydrogen.
Match the following columns and select the correct option.
Column-IColumn-II
(a)Clostridium butylicum(i)Cyclosporin-A 
(b)Trichoderma polysporum(ii)Butyric Acid
(c)Monascus purpureus(iii) Citric Acid
(d) Aspergillus niger(iv) Blood cholesterol-lowering agent
 (a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)
Which of the following can be used as a biocontrol agent in the treatment of plant disease? Trichoderma
Which of the following in sewage treatment removes suspended solids? Primary treatment
Which of the following is put into Anaerobic sludge digester for further sewage treatment? Activated sludge
Select the correct group of biocontrol agents. Trichoderma, Baculovirus, Bacillus thuringiensis
The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the Methanogens
Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct? Clostridium butylicum - Lactic acid
By all of the following ways, bacteria can become resistant to the antibiotic, except - 
 Moving away from the drug.
Cultivation of Bt cotton has been much in the news. The prefix "Bt" means Carrying an endotoxin gene from Bacillus thuringiensis

Molecular Basis Of Inheritance Class 12 Medical Biology MCQ Quiz

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Molecular Basis Of Inheritance Questions and Answers

Molecular Basis Of Inheritance Quiz Question Answer
A human gene product can be produced by genetically engineered bacteria. This is possible, because the Genetic code is universal.
Genetic code determines
 Sequence of amino acid in protein chain.
64 Codons constitute genetic code because
 Genetic code is triplet.
Length of one loop of B DNA is
 3.4 nm
How many nucleotides in messenger RNA's sequence makes a codon for an amino acid?
 Three
What would happen if in a gene encoding a polypeptide of 50 amino acids, 25$$^{th}$$ codon (UAU) is mutated to UAA?
 A polypeptide of 24 amino acids will be formed.
 Nirenberg synthesized an mRNA containing 34 poly-Adenine (A-A-A-A-A-A-----) and found a polypeptide formed of 11 poly-lysine this proved that genetic code for lysine was
 A-A-A triplet
Genetic code consists of
 All of the above
In the base sequence, one strand of DNA is GAT, TAG ,CAT, GAC. what shall be the sequence of its complementary strand?
 CTA, ATC, GTA, CTG
Watson & Crick proposed the model of DNA structures in which of the following years?
 1953

Organisms And Population Class 12 Medical Biology MCQ Quiz

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Organisms And Population Questions and Answers

Organisms And Population Quiz Question Answer
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other? Yucca
The above graph depicts changes in two populations (A and B) of herbivores in a grassy field A, possible reason for these changes is that
333402.png		 Population B competed more successfully for food than population A.
If '+' sign is assigned to beneficial interaction, '-' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '-' refers to Parasitism
Which one of the following populations interactions is widely used in medical science for the production of antibiotics? Amensalism
Natality refers to  Birth rate
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is Commensalism.
The principle of competitive exclusion was stated by G. F. Gause
In which of the following interactions, both partners are adversely affected? Competition
Assertion : Death is one of the important regulatory process on earth.

Reason : It avoids over-crowding caused by continuous reproduction.		 Both Assertion and Reason are true and Reason is a correct explanation of Assertion
What are labelled phases A, B ans C in given sigmoidal growth curve?
470694_934e643e70f04515a6f7c07e59ff363e.png		 A: Lag, B: Log, C: Stationary

Principles Of Inheritance And Variation Class 12 Medical Biology MCQ Quiz

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Principles Of Inheritance And Variation Questions and Answers

Principles Of Inheritance And Variation Quiz Question Answer
Which one of the following conditions though harmful in itself, is also a potential survivor from a mosquito borne infectious disease?
 Sickle cell anaemia
Which of the following is the example of pleiotropy? Sickle cell anaemia
A common test to find the genotype of hybrid is by Crossing of one F$$_1$$ progeny with male parent
Which of the following pairs is wrongly matched ? Starch synthesis in pea : Multiple alleles
Experimental verification of the chromosomal theory of inheritance was done by Morgan
What is the genetic disorder in which an individual has an overall masculine development gynaecomastia, and is sterile? Klinefelter's syndrome
Male XX and female XY sometime such conditions occur due to Transfer of segments in X and Y chromosomes
In a testcross involving $$F_1$$ dihybrid flies, more parental type offsprings were produced than the recombinant type offsprings. This indicates that The two genes are linked and present on the same chromosome.
A human female with Turner's syndrome
 Has 45 chromosomes with XO
Select the correct statements: Punnett square was developed by British scientist.

Reproduction In Organisms Class 12 Medical Biology MCQ Quiz

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Reproduction In Organisms Questions and Answers

Reproduction In Organisms Quiz Question Answer
Which of the following is wrong statement? In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile.
Fertilization is fusion of
 Haploid spermatozoan with haploid ovum to form diploid zygote
The vegetative reproduction in Bryophyllum takes place through which part of the plant? Leaf
Regarding fertilization which among the following statements is incorrect
 Paternal and maternal sets contribute to the diploid number without causing any variation
Formation of an organism from a single, male gamete without fusion with egg is an example of Parthenogenesis
In sexual reproducing animals, the union of male and female gamete forms a cell, which is called as Zygote
A polyoestrus animal is
 Rabbit
Fusion of dissimilar gametes is
 Fertilization
Which of the following is the part through vegetative propagation occur in a jasmine plant? Stem
The word estrus means Heat

Reproductive Health Class 12 Medical Biology MCQ Quiz

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Reproductive Health Questions and Answers

Reproductive Health Quiz Question Answer
Match the following sexually transmitted diseases(Column-I) with their causative agent (Column-II) and select the correct option.
Column-IColumn-II
(a) Gonorrhea(i) HIV
(b) Syphilis(ii) Neisseria
(c) Genital Warts(iii) Treponema
(d) AIDS(iv) Human Papilloma-Virus
 (ii), (iii), (iv), (i)
Select the option including all sexually transmitted diseases. Gonorrhoea, Syphilis, Genital herpes
Biotic potential refers to
 Increase of population under optimum environmental conditions
Sexually transmitted disease is also called as Venereal diseases
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Control of many diseases such as plague, smallpox, malaria etc causes Sharp rise in population
Which one of the following is not an STD? Huntington disease
A venereal or sexually transmitted disease is  Syphilis
Starvation death decreases due to Agriculture revolution
What is the meaning of infertility ?  Unable to produce children

Sexual Reproduction In Flowering Plants Class 12 Medical Biology MCQ Quiz

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Sexual Reproduction In Flowering Plants Questions and Answers

Sexual Reproduction In Flowering Plants Quiz Question Answer
In water hyacinth and water lily, pollination takes place by : Insects or wind
Ray florets have Inferior ovary
Attractants and rewards are required for Entomophily
A dioecious flowering plant prevents both Autogamy and geitonogamy
Pollination in water hyacinth and water lily is brought about by the agency of Insects or wind
Geitonogamy involves
 Fertilization of a flower by the pollen from another flower of the same plant.
Which one of the following may require pollinators, but is genetically similar to autogamy? Geitonogamy
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by Wind
Exine of pollen is composed of ? Sporopollenin
Assertion : Photomodulation of flowering is phytochrome-regulated process.

Reason : Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.
 If the assertion is true but the reaon is false

Strategies For Enhancement In Food Production Class 12 Medical Biology MCQ Quiz

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Strategies For Enhancement In Food Production Questions and Answers

Strategies For Enhancement In Food Production Quiz Question Answer
By which method was a new breed `Hisardale' of sheep formed by using Bikaneri ewes and Marino rams? Cross breeding
Read the following four statements (A-D).

(A) Colostrum is recommended for the newborn, because it is rich in antigen.
(B) Chikungunya is caused by a Gram-negative bacterium.
(C) Tissue culture has proved useful in obtaining virus-free plants.
(D) Beer is manufactured by the distillation of fermented grape juice.

How many of the above statements are wrong?
 Three
Interspecific hybridization is the mating of _________. Two different related species
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The branch of biology which deals with the improvement of plant variety is Plant breeding
Apis is economically important as it produces Both A and B
Wax is obtained from  Apiculture
Mule is the interspecific breed of Male donkey and female horse
Wool is obtained from the fleece of __________________ Sheep
As a general rule, inbreeding is possible between 
 Any two members of a species

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