CBSE 12 Biology Question Paper-2022 Set-1 - Practice Test
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  2. Practice Tests
  3. CBSE 12 Biology Question Paper-2022 Set-1
CBSE 12 Biology Question Paper-2022 Set-1

CBSE 12 Biology Question Paper-2022 Set-1 - Practice Test

This mock test includes actual CBSE Class 12 Biology board exam questions from the year 2022 Set-1, helping students understand exam trends and practice real paper format

2025-08-13
Pavan Pavan
CBSE Class 12 Biology 2022 Grade 12

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

Enumerate the main sources of bio-fertilizers giving one example of each.

A
Vermicompost, Leguminous plants
B
Chemical fertilizers, Pesticides
C
Synthetic fertilizers, Herbicides
D
Vermicompost, Green manure

Explain giving reason the action plan followed by organic farmers that support their key belief 'biodiversity furthers health of crop lands'.

A
They focus on crop rotation and reducing monoculture.
B
They use genetically modified seeds to increase yield.
C
They rely on synthetic fertilizers for better crop production.
D
They focus on using pesticides to protect crops from pests.

State the role of a selectable marker in r-DNA technology.

A
It helps in identifying cells that have taken up the recombinant DNA.
B
It enhances the growth of the plant cells.
C
It acts as a growth inhibitor for non-transformed cells.
D
It blocks the gene expression of host cells.

What are plasmids? How are they different from cloning vectors? Give one example each for a viral and a bacterial cloning vector.

A
Plasmids are small circular DNA used for genetic engineering; Cloning vectors are larger DNA molecules.
B
Plasmids are synthetic DNA used for cloning; Cloning vectors are viral RNA.
C
Plasmids are linear DNA found in viruses; Cloning vectors are used for gene sequencing.
D
Plasmids are used for gene therapy; Cloning vectors are used for producing vaccines.

Name any three techniques used for introducing an alien DNA into a host cell and mention how?

A
Electroporation, Microinjection, Agrobacterium-mediated transformation
B
Polymerase chain reaction, Electrophoresis, DNA sequencing
C
Cloning, PCR, Transformation
D
RNA interference, CRISPR, Gel electrophoresis

How many episodes of mass extinctions of species have already taken place and which one is in progress in the current era?

A
Six mass extinctions, no new extinction in progress
B
Three mass extinctions, the fourth is in progress
C
Five mass extinctions, the sixth is in progress
D
Two mass extinctions, the third is in progress

Write the impact on the biodiversity of the area that you can interpret based on the given data in the histogram.

A
A decline in the shark population will impact the food chain and species richness.
B
An increase in shark population will lead to better species diversity.
C
Sharks are not affected by human activities, so biodiversity remains unaffected.
D
Sharks help in maintaining the balance of marine plant life.

How did David Tilman show experimentally that stability of community depends upon its species richness?

A
By observing the survival of plant species in diverse ecosystems.
B
By testing the growth rates of different species in isolation.
C
By introducing a single species and observing ecosystem balance.
D
By analyzing the population dynamics in a controlled environment.

What is the importance of female Anopheles mosquitoes in the life of a malarial parasite Plasmodium?

A
They are vectors that transfer the Plasmodium parasite to humans.
B
They provide nutrition to the Plasmodium parasite.
C
They enhance the replication of the Plasmodium parasite.
D
They produce the Plasmodium parasite in their eggs.

Mention the parts of the human body that get affected by Pneumonia and common cold infections. Write the causative agents of the two diseases.

A
Pneumonia affects the lungs; caused by bacteria or viruses. Common cold affects the upper respiratory tract; caused by rhinovirus.
B
Pneumonia affects the digestive system; caused by bacteria. Common cold affects the lungs; caused by influenza virus.
C
Pneumonia affects the heart; caused by fungi. Common cold affects the brain; caused by enterovirus.
D
Pneumonia affects the kidneys; caused by parasites. Common cold affects the nervous system; caused by respiratory syncytial virus.

What is the biological process responsible for the production of cattle excreta as a domestic fuel?

A
Methanogenesis, where microorganisms break down organic material in the excreta.
B
Fermentation, where microbes convert sugars into alcohol.
C
Nitrification, where bacteria convert nitrogen into usable forms.
D
Photosynthesis, where plants convert sunlight into energy stored in the excreta.

Which of the following is the most significant factor in the regulation of gene expression in eukaryotic cells?

A
DNA methylation and histone modification.
B
Cell size and shape.
C
Protein folding and phosphorylation.
D
Ribosome concentration and RNA splicing.

What type of mutation leads to a change in the amino acid sequence of a protein?

A
Missense mutation.
B
Silent mutation.
C
Nonsense mutation.
D
Frameshift mutation.

Which of the following is true regarding the cell cycle?

A
The cell cycle consists of interphase and mitotic phase.
B
The cell cycle is only present in eukaryotic cells.
C
The cell cycle only includes mitosis and cytokinesis.
D
The cell cycle occurs only during cell differentiation.

What is the main function of ribosomes in a cell?

A
To synthesize proteins based on mRNA instructions.
B
To synthesize lipids and steroids.
C
To digest cellular waste products.
D
To provide energy to the cell.

Which of the following is a characteristic of prokaryotic cells?

A
They lack a membrane-bound nucleus.
B
They have multiple linear chromosomes.
C
They contain membrane-bound organelles.
D
They have a cytoskeleton.

What is the function of the Golgi apparatus in a cell?

A
It modifies, sorts, and packages proteins for secretion.
B
It produces energy in the form of ATP.
C
It is responsible for synthesizing proteins.
D
It breaks down waste materials and cellular debris.

Which of the following processes is responsible for the production of ATP in mitochondria?

A
Cellular respiration.
B
Photosynthesis.
C
Fermentation.
D
Molecular diffusion.

Which organelle is known as the powerhouse of the cell?

A
Mitochondrion.
B
Endoplasmic reticulum.
C
Nucleus.
D
Golgi apparatus.

What is the purpose of the phospholipid bilayer in the cell membrane?

A
To provide structural support and protection to the cell.
B
To regulate the passage of ions and molecules into and out of the cell.
C
To synthesize proteins for cellular functions.
D
To store genetic information.

Which process involves the transfer of genetic material between two bacterial cells through a pilus?

A
Transduction
B
Conjugation
C
Transformation
D
Replication

What is the primary function of tRNA in protein synthesis?

A
To carry amino acids to the ribosome for protein synthesis.
B
To catalyze the formation of peptide bonds.
C
To transcribe DNA into RNA.
D
To unwind the DNA during replication.

Which structure in plant cells is responsible for photosynthesis?

A
Chloroplast
B
Mitochondrion
C
Nucleus
D
Endoplasmic reticulum

What type of RNA carries the genetic information from DNA to the ribosome for protein synthesis?

A
mRNA
B
rRNA
C
tRNA
D
snRNA

Which part of the cell cycle is characterized by cell growth and DNA replication?

A
Interphase
B
Mitosis
C
Cytokinesis
D
G1 phase

Which of the following is not a part of the cytoskeleton in eukaryotic cells?

A
Microtubules
B
Intermediate filaments
C
Chromatin
D
Actin filaments

Which molecule carries the genetic code from the nucleus to the cytoplasm?

A
mRNA
B
tRNA
C
DNA
D
rRNA

Which of the following is a function of the smooth endoplasmic reticulum?

A
Synthesis of lipids
B
Protein synthesis
C
Protein packaging
D
Energy production

Which of the following enzymes is responsible for unwinding the DNA during replication?

A
DNA polymerase
B
Helicase
C
Ligase
D
Topoisomerase

What is the role of the spindle fibers during mitosis?

A
To pull the chromatids apart.
B
To organize the chromosomes.
C
To replicate DNA.
D
To package the chromosomes.