CBSE 12 Biology Question Paper-2020 Set-5 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Biology Question Paper-2020 Set-5
CBSE 12 Biology Question Paper-2020 Set-5

CBSE 12 Biology Question Paper-2020 Set-5

This mock test includes actual CBSE Class 12 Biology board exam questions from the year 2020 Set-6, 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

30

Marking

Negative

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Questions Preview

Louis Pasteur demonstrated that

A
non-living chemicals produced living molecules
B
early life came from outer space
C
life comes from pre-existing life
D
life originated spontaneously

The first cellular form of life evolved

A
in air
B
on land
C
in water environment
D
in deep soil

Mating of a superior male of a breed of a cattle to a superior female of another breed is called

A
out crossing
B
cross breeding
C
out breeding
D
in breeding

In a bacterium when RNA-polymerase binds to the promoter on a transcription unit during transcription, it

A
inactivates the exons
B
initiates the process
C
terminates the process
D
helps remove introns

Which one of the following part of the plant when put into the soil is likely to produce new offspring?

A
Part of an internode
B
A stem cutting with a node
C
Part of a primary root
D
A flower

In a bacterium when RNA-polymerase binds to the promoter on a transcription unit during transcription, it

A
terminates the process
B
helps remove introns
C
initiates the process
D
inactivates the exons

Which of the following statements about Mendel’s law of inheritance is true?

A
It explains the inheritance of traits only in animals
B
It is applicable to all organisms
C
It only explains dominant traits
D
It applies only to plants

What is the role of DNA in the process of protein synthesis?

A
DNA provides the energy required for protein synthesis
B
DNA acts as a template for RNA synthesis
C
DNA provides amino acids for the protein synthesis
D
DNA stores proteins

The first cellular form of life evolved

A
in air
B
on land
C
in water environment
D
in deep soil

What is the process of photosynthesis?

A
The process by which plants convert water and oxygen into energy
B
The process by which plants convert sunlight into chemical energy
C
The process by which plants convert carbon dioxide into oxygen
D
The process by which plants convert glucose into oxygen

Which part of the plant is responsible for photosynthesis?

A
Roots
B
Leaves
C
Stem
D
Flowers

What is the function of ribosomes in cells?

A
Synthesizing DNA
B
Producing energy for the cell
C
Synthesizing proteins
D
Transporting molecules across the cell

The genetic material in prokaryotic cells is found in the:

A
Nucleus
B
Plasmid
C
Cytoplasm
D
Chromosome

Which of the following is not a function of the mitochondria?

A
ATP production
B
Cell division
C
Respiration
D
Protein synthesis

What is the main function of chloroplasts in plant cells?

A
They store energy in the form of glucose
B
They regulate water balance in the cell
C
They help in the absorption of light for photosynthesis
D
They store genetic information

Which of the following is a product of cellular respiration?

A
Oxygen
B
Glucose
C
Carbon dioxide
D
Water

The process by which plants lose water vapor through their leaves is called

A
Transpiration
B
Evaporation
C
Condensation
D
Photosynthesis

Which of the following is the correct sequence of events during cell division?

A
Interphase, Prophase, Metaphase, Anaphase, Telophase
B
Prophase, Metaphase, Interphase, Anaphase, Telophase
C
Metaphase, Prophase, Interphase, Anaphase, Telophase
D
Anaphase, Telophase, Metaphase, Interphase, Prophase

Which organelle is known as the powerhouse of the cell?

A
Mitochondria
B
Nucleus
C
Ribosome
D
Endoplasmic reticulum

Which of the following is not a characteristic of prokaryotic cells?

A
No nucleus
B
Single-celled organisms
C
Contains membrane-bound organelles
D
Contains DNA

Which of the following is the main function of the Golgi apparatus?

A
Protein synthesis
B
Transport of proteins
C
Modification and packaging of proteins
D
Storage of nutrients

In which part of the cell does glycolysis occur?

A
Mitochondria
B
Nucleus
C
Cytoplasm
D
Endoplasmic reticulum

What is the primary function of chlorophyll in plants?

A
Absorbing light for photosynthesis
B
Absorbing water for transpiration
C
Transmitting signals for plant growth
D
Storing energy for the plant

What is the main function of the ribosomes in the cell?

A
Protein synthesis
B
Energy production
C
DNA replication
D
Transport of molecules

Which of the following is a characteristic of plant cells but not animal cells?

A
Cell wall
B
Centrioles
C
Lysosomes
D
Cilia

What is the function of the smooth endoplasmic reticulum?

A
Lipid synthesis
B
Protein synthesis
C
Carbohydrate storage
D
Energy production

In which part of the plant does transpiration primarily occur?

A
Roots
B
Stem
C
Leaves
D
Flowers

Which of the following is an example of an autotrophic organism?

A
A cow
B
A lion
C
A plant
D
A human

The process of making RNA from a DNA template is called

A
Translation
B
Replication
C
Mutation
D
Transcription

Which of the following is the primary function of the vacuole in plant cells?

A
Photosynthesis
B
Energy production
C
Protein synthesis
D
Storage of water and nutrients