12th Biology Set 3 Model Question Paper English Medium PDF Download

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V.M.G.R.R SRI SARADA SAKTHI MAT. HR. SEC. SCHOOL
STD: XII BIOLOGY SET-3 (B L-2,8 Z L -3,9) MARKS-50

I.CHOOSE THE CORRECT ANSWER : 35X1=35
1. Which of the molecule have the ability to convert a precursorb in the cell of peaplant?
a) Le; le b) GAI c)Le d) le
2.Which of the following is correct match for the Column I and Column IL
et
Column - I Column - II
I). 0.2 to 2.00 mm i) Slit soil
i.N
II) Less than 0.002 mm ii) Clayey soil
III) 0.002 to 0.02 mm iii) Sandy soil
IV) 0.002 to 0.2 mm iv) Loamy soil
la
a) ii iii iv i
b) iv
sa i iii ii
c) iii ii i iv
da
d) None of the above
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3.Assertion: Vegetables are important part of healthy eating.

Reason: Vegetables are succulent structures of plants with pleasant aroma and flavours.
a) Assertion is correct, Reason is wrong
w.
b) Assertion is wrong, Reason is correct

c) Both are correct and reason is the correct explanation for assertion.
d) Both are correct and reason is not the correct explanation for assertion.
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4. 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
a) i – I, ii – II, iii – III, iv – IV b) i – III, ii – I, iii – IV, iv – II
c) i – IV, ii – II, iii – I, iv – IV d) i – II, ii – IV, iii – III, iv – I
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5. Deforestation does not lead to

a) Quick nutrient cycling b) soil erosion
c) alternation of local weather conditions d) Destruction of natural habitat weather
conditions
6. Solar energy used by green plants for photosynthesis is only
a) 2 – 8% b) 2 – 10% c) 3 – 10% d) 2 – 9%
7. Which of the following is / are not the mechanism of decomposition
a) Eluviation b) Catabolism c) Anabolism d) Fragmentation
8.Arrange the correct sequence of ecological hierarchy starting from lower to higher level.
a) Individual organism → Population Landscape → Ecosystem
et
b) Landscape → Ecosystem → Biome → Biosphere
c) community → Ecosystem → Landscape → Biome
i.N
d) Population → organism → Biome → Landscape
9. Ecology is the study of an individual species is called
i) Community ecology ii) Autecology iii) Species ecology iv) Synecology
a) i only b) ii only c) i and iv only d) ii and iii only
la
10. Solidifying agent used in plant tissue culture is
a) Nicotinic acid
sa b) Cobaltous chloride c) EDTA d) Agar
11. The time duration for sterilization process by using autoclave is ______ minutes and the
temperature is _____
a) 10 to 30 minutes and 125° C b) 15 to 30 minutes and 121° C
c) 15 to 20 minutes and 125° C d) 10 to 20 minutes and 121° C
da
12. Restriction enzymes are
a. Not always required in genetic engineering b. Essential tools in genetic
engineering
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c. Nucleases that cleave DNA at specific sites d. both b and c

13. Plasmids are
a. circular protein molecules b. required by bacteria
c. tiny bacteria d. confer resistance to antibiotics
w.
14. Match list I with list II
List I List II
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A. A pair of chromosomes extra with i) monosomy

diploid
B. One chromosome extra to the diploid ii) tetrasomy
C. One chromosome loses from diploid iii) trisomy
D. Two individual chromosomes lose from iv) double monosomy
diploid
a) A-i, B-iii, C-ii, D-iv b) A-ii, B-iii, C-iv, D-i c) A-ii, B-iii, C-i, D-iv d) A-iii, B-ii, C-i, D-iv
15. Which one of the following is an example of polygenic inheritance?
a) Flower colour in Mirabilis Jalapa b) Production of male honey bee
c) Pod shape in garden pea d) Skin Colour in humans

16.Choose the correct statement(s) about tenuinucellate ovule

a) Sporogenous cell is hypodermal
b) Ovules have fairly large nucellus
c) sporogenous cell is epidermal
d) ovules have single layer of nucellus tissue
17. Which of the following represent megagametophyte
et
a) Ovule b)Embryo sac c)Nucellus d)Endosperm
18.Animals giving birth to young ones:
a) Oviparous b) Oviviviparous c) Viviparous d) Both a and b
i.N
19.Human beings are unisexual animals, the type of Syngamy in human beings is __
a) autogamy b) exogamy c)hologamy d) paedogamy
20.Which among the following animlas exhibits Oviviviparity?
a)Frog b) shark c)sheep d)hen
la
21. The glandular accessory organ which produces the largest proportion of semen is
a. Seminal vesicle
sa b. Bulbourethral gland c. Prostate gland d. Mucous
gland
22.The male homologue of the female clitoris is
a. Scrotum b. Penis c. Urethra d.Testis
23.Identify the correct statements from the following
da
(a) Chlamydiasis is a viral disease.
(b) Gonorrhoea is caused by a spirochaete bacterium, Treponema palladium.
(c) The incubation period for syphilis is is 2 to 14 days in males and 7 to 21 days in
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females.
(d) Both syphilis and gonorrhoea are easily cured with antibiotics.
24.A contraceptive pill prevents ovulation by
w.
(a) blocking fallopian tube (b) inhibiting release of FSH and LH

(c) stimulating release of FSH and LH (d) causing immediate degeneration of released
ovum.
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25.Choose the correctly match pair.

a) Amphetamines - Stimulant b) LSD - Narcotic
c) Heroin - Psychotropic d) Benzodiazepine - Pain killer
26. A 30 year old woman has bleedy diarrhoea for the past 14 hours, which one of the following
organisms is likely to cause this illness?
a) Streptococcus pyogens b)Clostridium difficile
c)Shigella dysenteriae d)Salmonella enteritidis
27. B cells that produce and release large amounts of antibody are called
a) Memory cells b) Basophils c) Plasma cells d) killer cells
28.Cry toxins obtained from Bacillus thuringiensis are effective against for______

a) Mosquitoes b) Flies c) Nematodes d) Bollworms
29. Cyclosporin – A is an immunosuppressive drug produced from _______

a) Aspergillus niger b) Manascus purpureus
c) Penicillium notatum d) Trichoderma polysporum
30. The genetic defect adenosine deaminase deficiency may be cured permanently by
a) Enzyme replacement therapy
b) periodic infusion of genetically engineered lymphocytes having ADA cDNA
c) administering adenosine deaminase activators
d) introducing bone marrow cells producing ADA into embryo at an early stage of
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development.
31. The first clinical gene therapy was done for the treatment of
a) AIDS b) Cancer c) Cystic fibrosis d) SCID
i.N
32.Recombinant Factor VIII is produced in the ------- cells of the Chinese Hamster
a) Liver cells b) blood cells c) ovarian cells d) brain cells.
33.PCR proceeds in three distinct steps governed by temperature, they are in order of
la
a) Denaturation, Annealing, Synthesis b) Synthesis, Annealing, Denaturation
c) Annealing, Synthesis, Denaturation d) Denaturation, Synthesis, Annealing
chloestrol level.
sa
a) X is cyclosporine b) X is Statins c) X is Humulin d) X is Kanamycin
35.
da
a) Natural selection b) induced mutation
c) reproductive isolation d) geographical isolation
Pa
II.ANSWER THE FOLLOWING : 3X5=15

36. Differentiate incomplete dominance and codominance.
OR
w.
Bring out the inheritance of chloroplast gene with an example.
37.What are the strategies to be implemented in India to attain total reproductive health?
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OR
Explain the best suited type followed by plant breeders at present?
38.
disease
ii) Name the hereditary disease for which the first clinical gene therapy was used.
iii) Mention the steps involved in gene therapy to treat this disease.

OR
PCR is a useful tool for early diagnosis of an Infectious disease. Elaborate.
et
i.N
la
sa
da
Pa
w.
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12th Biology Set 3 Model Question Paper English Medium PDF Download

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www.Padasalai.Net. www.Trb Tnpsc.

V.M.G.R.R SRI SARADA SAKTHI MAT. HR. SEC. SCHOOL

STD: XII BIOLOGY SET-3 (B L-2,8 Z L -3,9) MARKS-50

IV) 0.002 to 0.2 mm iv) Loamy soil

3.Assertion: Vegetables are important part of healthy eating.

b) Assertion is wrong, Reason is correct

4. Match Column I with Column II

Kindly Send Me Your Key Answers to Our email id - padasalai.net@gmail.com

5. Deforestation does not lead to

c. Nucleases that cleave DNA at specific sites d. both b and c

14. Match list I with list II

A. A pair of chromosomes extra with i) monosomy

Kindly Send Me Your Key Answers to Our email id - padasalai.net@gmail.com

16.Choose the correct statement(s) about tenuinucellate ovule

(a) blocking fallopian tube (b) inhibiting release of FSH and LH

25.Choose the correctly match pair.

Kindly Send Me Your Key Answers to Our email id - padasalai.net@gmail.com

a) Mosquitoes b) Flies c) Nematodes d) Bollworms

29. Cyclosporin – A is an immunosuppressive drug produced from _______

II.ANSWER THE FOLLOWING : 3X5=15

Bring out the inheritance of chloroplast gene with an example.

Explain the best suited type followed by plant breeders at present?

Kindly Send Me Your Key Answers to Our email id - padasalai.net@gmail.com

PCR is a useful tool for early diagnosis of an Infectious disease. Elaborate.

Kindly Send Me Your Key Answers to Our email id - padasalai.net@gmail.com

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