CBSE 12 Biology Question Paper-2020 Set-3 by Pavan | Practice Test to Test Your Knowledge
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  2. Practice Tests
  3. CBSE 12 Biology Question Paper-2020 Set-3
CBSE 12 Biology Question Paper-2020 Set-3

CBSE 12 Biology Question Paper-2020 Set-3

This mock test includes actual CBSE Class 12 Biology board exam questions from the year 2020 Set-3, helping students understand exam trends and practice real paper format

2025-08-07
Pavan Pavan
CBSE Class 12 Biology 2020 Grade 12

Duration

30 min

Questions

27

Marking

Negative

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Questions Preview

Which one of the following is not the product of transgenic experiments?

A
Pest-resistant crop variety
B
High nutritional value in grains
C
Production of insulin by rDNA technique
D
Drought-resistant crops

The diagnostic test that confirms typhoid in humans is

A
ELISA
B
Widal
C
MRI
D
Amniocentesis

Asexual reproduction by zoospores is observed in

A
Penicillium
B
Hydra
C
Sponge
D
Chlamydomonas

Cleistogamous flowers are self-pollinated because

A
They are bisexual flowers which do not open at all.
B
They are bisexual and open flowers.
C
They are unisexual.
D
Their stigma matures before the anthers dehisce.

In Bryophyllum, vegetative propagation occurs by

A
Stem cuttings
B
Axillary buds
C
Root hair
D
Leaf buds

The bioactive molecule used as an immunosuppressive agent during organ transplant is

A
Tetracycline
B
Cyclosporin-A
C
Statin
D
Streptomycin

‘Blue revolution’ refers to

A
Construction of water dams for conservation of water
B
Production of fish in large quantities
C
Sewage treatment
D
Controlling algal bloom

The diagnostic test that confirms typhoid in humans is

A
ELISA
B
Widal
C
MRI
D
Amniocentesis

Cleistogamous flowers are self-pollinated because

A
They are bisexual flowers which do not open at all.
B
They are bisexual and open flowers.
C
They are unisexual.
D
Their stigma matures before the anthers dehisce.

Which of the following is not a product of transgenic experiments?

A
Pest-resistant crop variety
B
High nutritional value in grains
C
Production of insulin by rDNA technique
D
Drought-resistant crops

The theory of evolution supported by the experiment conducted by Louis Pasteur is

A
Spontaneous generation theory
B
Life comes only from pre-existing life
C
Abiogenesis of life
D
Big bang theory

The bioactive molecule used as an immunosuppressive agent during organ transplant is

A
Tetracycline
B
Cyclosporin-A
C
Statin
D
Streptomycin

Write the ploidy and number of chromosomes in human (a) meiocytes, and (b) gametes.

A
Meiocytes - 2n, Gametes - n
B
Meiocytes - n, Gametes - 2n
C
Meiocytes - n, Gametes - n
D
Meiocytes - 2n, Gametes - 2n

What is aneuploidy? Name a chromosomal disorder in humans caused due to (a) gain of an autosome, and (b) loss of a sex chromosome in females.

A
Down's syndrome, Turner syndrome
B
Klinefelter syndrome, Down's syndrome
C
Turner syndrome, Klinefelter syndrome
D
Down's syndrome, Klinefelter syndrome

State a functional difference between the following codons: (a) AUG and (b) UAA

A
AUG is the start codon, UAA is a stop codon
B
AUG codes for protein, UAA codes for enzymes
C
AUG is for amino acids, UAA is for translocation
D
AUG is a stop codon, UAA is the start codon

Identify any two marsupials from the list given below: (i) Lemur, (ii) Spotted cuscus, (iii) Flying phalanger, (iv) Bobcat, (v) Tasmanian wolf, (vi) Mole

A
Lemur, Mole
B
Spotted cuscus, Tasmanian wolf
C
Flying phalanger, Bobcat
D
Lemur, Tasmanian wolf

‘Australian marsupials exhibit adaptive radiation.’ Justify the statement.

A
Marsupials evolved to fill ecological niches in Australia
B
Marsupials are adaptable to environmental changes in Australia
C
Marsupials have evolved to adapt to diverse climates in Australia
D
Marsupials have diversified into different species in Australia

Name the type of immunity the mother provides the newborn baby. How does it happen?

A
Active immunity, through vaccination
B
Passive immunity, through antibodies in breast milk
C
Natural immunity, through exposure to infections
D
Innate immunity, through innate defenses

What is the function of T-lymphocytes?

A
They help in the production of antibodies
B
They fight infections by attacking infected cells
C
They help in the recognition of pathogens
D
They produce interferons

Which of the following hormones is administered to cows using MOET technology?

A
Oxytocin
B
Estradiol
C
FSH (Follicle Stimulating Hormone)
D
Progesterone

What is the function of spleen in the human body?

A
It filters blood and helps in the destruction of old red blood cells
B
It stores red blood cells
C
It produces white blood cells for immunity
D
It regulates blood pressure

Which of the following is responsible for the production of insulin in humans?

A
Pancreas
B
Liver
C
Stomach
D
Thyroid gland

What does the term ‘Asexual reproduction by zoospores’ refer to?

A
Reproduction without fertilization
B
Reproduction involving spores released by an organism
C
Reproduction by the fusion of gametes
D
Reproduction through external fertilization

What is the ploidy level of human gametes?

A
Diploid
B
Haploid
C
Tetraploid
D
Triploid

What type of immunity does a newborn baby receive from its mother?

A
Active immunity
B
Passive immunity
C
Innate immunity
D
Adaptive immunity

Which of the following is responsible for transporting oxygen in human blood?

A
White blood cells
B
Red blood cells
C
Platelets
D
Plasma

What is the main function of lymphatic system?

A
Transport oxygen to tissues
B
Regulate blood pressure
C
Defend the body against infections
D
Carry carbon dioxide away from tissues