CBSE 12 Biology Question Paper- 2022 Set-4 - Practice Test
Students

Academic Programs

AI-powered learning for grades 8-12, aligned with major curricula

Engineering Courses
Professional

Professional Courses

Industry-relevant training in Business, Technology, and Design

Certifications
Games

Interactive Games

Fun games to boost memory, math, typing, and English skills

  2. Practice Tests
  3. CBSE 12 Biology Question Paper- 2022 Set-4
CBSE 12 Biology Question Paper- 2022 Set-4

CBSE 12 Biology Question Paper- 2022 Set-4 - Practice Test

This mock test includes actual CBSE Class 12 Biology board exam questions from the year 2022 Set-4, 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

28

Marking

Negative

You've not yet enrolled in this practice test. Please login to start practice test.

Questions Preview

What are Interferons? State their role in the treatment of cancer.

A
Proteins that help in the immune response to cancer
B
Proteins that inhibit the growth of tumors
C
Hormones that stimulate cancer cell growth
D
Enzymes that break down cancer cells

What is the role of Interferons in cancer treatment?

A
They stimulate the immune system to target cancer cells
B
They induce cancer cell death through apoptosis
C
They prevent cancer cells from multiplying
D
They repair DNA in cancer cells

What is the population growth pattern shown by the graphs in the question paper?

A
Exponential growth due to favorable conditions
B
Logistic growth with carrying capacity
C
No growth due to lack of resources
D
Fluctuating growth with sudden spikes

Which bacterium is found in the anaerobic sludge during sewage treatment and in the rumen of cattle?

A
Escherichia coli
B
Bacillus thuringiensis
C
Methanogens
D
Lactobacillus

What is the function of the bacterium Methanogens in sewage treatment?

A
Convert organic waste into methane gas
B
Break down organic pollutants into harmless substances
C
Produce hydrogen gas for energy production
D
Degrade heavy metals in the sewage

Which of the following is true about Trichoderma species?

A
They are used in the treatment of viral diseases in plants
B
They decompose dead organic matter
C
They are biocontrol agents for plant pathogens
D
They improve soil fertility by nitrogen fixation

How are advanced ex-situ techniques helping in conserving threatened species?

A
By cloning endangered species in labs
B
By increasing genetic diversity through artificial breeding
C
By providing safer habitats outside natural ecosystems
D
By studying their behavior in captivity

What is recombinant DNA technology used for in biotechnology?

A
To produce genetically modified crops
B
To clone human organs for transplantation
C
To design new medications for viral infections
D
To increase animal population in farms

What are the primary and secondary lymphoid organs responsible for?

A
Producing antibodies for the immune response
B
Filtering out harmful microbes from the bloodstream
C
Developing defense mechanisms against foreign pathogens
D
Regulating the body's pH balance

Which species has been shown to be efficient in integrated pest management?

A
Bacillus thuringiensis
B
Trichoderma harzianum
C
Streptomyces species
D
Rhizobium species

Which enzyme is used to produce recombinant DNA?

A
DNA ligase
B
EcoR I
C
RNA polymerase
D
Helicase

What is the significance of EcoR I enzyme in recombinant DNA technology?

A
It cuts DNA at specific sites, enabling gene insertion
B
It helps in the replication of cloned DNA in bacteria
C
It adds extra bases to DNA during gene cloning
D
It unwinds the DNA strands for transcription

Which method is used for introducing a gene into a plant cell for genetic modification?

A
Gene gun
B
Electroporation
C
Agrobacterium-mediated transformation
D
Heat shock method

Which of the following is NOT a property of recombinant DNA?

A
It contains DNA from different sources
B
It is self-replicating in bacterial cells
C
It cannot be integrated into the host genome
D
It can be used to produce proteins or enzymes

What is the role of Bt toxin in genetically modified Bt-cotton?

A
It repels pests from feeding on the cotton plant
B
It makes the cotton plant resistant to bacterial infections
C
It kills the larvae of cotton pests
D
It improves the fiber quality of the cotton plant

Which of the following is the correct sequence for the stages of human insulin production through recombinant DNA technology?

A
Gene isolation → Gene insertion → Transformation → Culturing → Harvesting
B
Transformation → Gene isolation → Gene insertion → Culturing → Harvesting
C
Gene isolation → Culturing → Gene insertion → Transformation → Harvesting
D
Culturing → Transformation → Gene isolation → Gene insertion → Harvesting

What is the significance of species-area relationship in ecology?

A
It helps in understanding how species richness varies with area
B
It shows the number of species that can be cultivated in a given area
C
It measures the impact of climate change on species migration
D
It determines the types of vegetation in a specific area

Which statement is true about the stability of a community in relation to its species richness?

A
Communities with higher species richness tend to be more stable
B
Communities with higher species richness are less stable
C
Stability of a community is independent of species richness
D
Higher species richness leads to increased competition and instability

How does EcoR I enzyme contribute to recombinant DNA technology?

A
By cutting DNA at specific sites to enable gene splicing
B
By synthesizing complementary DNA strands
C
By introducing foreign DNA into the host cell
D
By copying the target gene in the lab

Which of the following is a common biocontrol agent used to control plant diseases?

A
Trichoderma harzianum
B
Escherichia coli
C
Bacillus subtilis
D
Saccharomyces cerevisiae

What is the primary advantage of using genetically modified crops?

A
Increased resistance to pests and diseases
B
Higher nutritional content in food products
C
Increased yield and growth rate of crops
D
All of the above

What is the primary function of the lymphatic system?

A
To transport oxygen to the tissues
B
To regulate body temperature
C
To remove waste and excess fluids from the body
D
To support digestion and nutrient absorption

Which of the following is true about the role of secondary lymphoid organs?

A
They produce antibodies for the immune response
B
They serve as sites for immune cell activation and response
C
They maintain a constant flow of blood throughout the body
D
They regulate the pH levels in the blood

Which of the following is a key characteristic of r-DNA technology?

A
It involves the use of viruses to insert genes into plants
B
It enables the formation of recombinant proteins in bacteria
C
It requires no additional enzymes for gene transfer
D
It only uses natural methods of gene insertion

What is a common application of Bacillus thuringiensis?

A
Biodegradation of plastics
B
Pest control in agriculture
C
Enhancing soil fertility
D
Increasing crop yields through genetic modification

How does gene gun technology work in plant genetic modification?

A
It uses a blast of air to introduce genes into plant cells
B
It delivers genes to plant cells using electric fields
C
It uses high-velocity particles to penetrate plant cell walls and deliver DNA
D
It employs bacteria to transfer genes to plants

Which of the following describes the role of plasmids in recombinant DNA technology?

A
They are used as vectors to transfer genes into host cells
B
They provide nutrients for bacteria to grow in the lab
C
They act as promoters for gene expression in plants
D
They store the genetic information of the host organism

What is the main purpose of using restriction enzymes in recombinant DNA technology?

A
To join DNA fragments together
B
To break down the host cell's DNA to release plasmids
C
To cut DNA at specific sites for gene insertion
D
To replicate the cloned DNA in bacteria