CBSE 12 Biology Question Paper-2022 Set-5 - Practice Test
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  2. Practice Tests
  3. CBSE 12 Biology Question Paper-2022 Set-5
CBSE 12 Biology Question Paper-2022 Set-5

CBSE 12 Biology Question Paper-2022 Set-5 - Practice Test

This mock test includes actual CBSE Class 12 Biology board exam questions from the year 2022 Set -5, 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

Many members of genus Glomus form a mycorrhizial association with plants. Elaborate how is this association beneficial to the plants.

A
It enhances the absorption of water and nutrients.
B
It protects plants from herbivores.
C
It increases photosynthesis in plants.
D
It helps in seed dispersion.

State the mode of action of cocaine on the human body. Write the scientific name of the source plant it is obtained from.

A
Cocaine stimulates the production of serotonin. (Cannabis sativa)
B
Cocaine enhances acetylcholine release. (Papaver somniferum)
C
Cocaine blocks the reuptake of dopamine in the brain. (Erythroxylum coca)
D
Cocaine inhibits norepinephrine secretion. (Nicotiana tabacum)

Which one of the two 'S.T.P.' (A) or (B) will be more effective in treating the human excreta in the municipal waste?

A
S.T.P. (A) is more effective as it uses a combination of biological and chemical treatment.
B
S.T.P. (B) is more effective as it relies on physical filtration.
C
Both are equally effective.
D
Neither are effective in treating human excreta.

Ringworm is one of the most common infectious fungal diseases in humans. Name any two genera of fungi which cause ringworm and state any of its two symptoms.

A
Candida and Aspergillus; Blisters and fever.
B
Penicillium and Fusarium; Headaches and nausea.
C
Rhizopus and Mucor; Skin lesions and swelling.
D
Trichophyton and Microsporum; Itchy skin and red patches.

Name the two most common types of HIV-related infections that lead to AIDS and explain why death is usually caused by these infections.

A
Malaria and dengue; because they are transmitted through vectors that further compromise immunity.
B
Influenza and Hepatitis; because they directly attack the liver and lungs, making them fatal.
C
Tuberculosis and Hepatitis C; because they are easily spread among HIV patients.
D
Pneumonia and tuberculosis; because they weaken the immune system, leading to severe complications.

State the method used for the treatment of sewage in a Sewage Treatment Plant (S.T.P.) and explain the steps followed in reducing the BOD of sewage.

A
The treatment method uses mechanical separation; The BOD is reduced by mechanical filtration.
B
The treatment method uses thermal techniques; The BOD is reduced by thermal degradation.
C
The treatment method involves biological and chemical processes; The BOD is reduced by aerobic bacteria in the treatment plant.
D
The treatment method uses a filtration process; The BOD is reduced by chemical agents.

What is the best method to measure the total population density of fishes in a river?

A
The best method is using sonar technology to detect fish populations.
B
The best method is using a net to capture all fishes in a section of the river.
C
The best method is to observe fish populations from above using drones.
D
The best method is the mark-recapture technique, where a sample is captured, marked, and released to observe recapture rates.

Which of the following statements correctly describes the significance of the enzyme DNA polymerase in genetic processes?

A
DNA polymerase repairs damaged DNA during the G1 phase of the cell cycle.
B
DNA polymerase unwinds the DNA double helix during replication.
C
DNA polymerase catalyzes the synthesis of DNA from nucleotides during replication.
D
DNA polymerase synthesizes RNA from DNA during transcription.

State any two categories of organisms that are adversely affected by competition.

A
Herbivores and carnivores; because they compete for food resources.
B
Producers and decomposers; because they compete for sunlight.
C
Producers and consumers; because they compete for water.
D
Plants and microorganisms; because they compete for space and nutrients.

What are the two most common methods used for genetic engineering in plants?

A
Gene gun and Agrobacterium-mediated transformation.
B
Polymerase chain reaction and gene editing.
C
Microinjection and somatic hybridization.
D
Bacterial conjugation and somatic fusion.

Name the host for the cloning vector pBR322.

A
Saccharomyces cerevisiae
B
Escherichia coli
C
Bacillus subtilis
D
Staphylococcus aureus

Which one of the following enzymes is responsible for cutting DNA at specific sequences in genetic engineering?

A
RNA polymerase
B
Restriction enzymes
C
DNA polymerase
D
DNA ligase

What is RNA interference (RNAi) and how is it used in controlling plant pests?

A
RNAi is used to modify the plant immune system to attract natural predators of the pest.
B
RNAi is used to silence specific genes by degrading their mRNA; it can be used to reduce the expression of pest genes.
C
RNAi is used to introduce foreign genes into pest DNA to make them resistant to environmental changes.
D
RNAi is used to enhance the expression of pest genes to make them more susceptible to pesticides.

Which of the following statements is true about the role of mast cells in allergic reactions?

A
Mast cells directly neutralize allergens by phagocytosis.
B
Mast cells release histamines that trigger allergic symptoms like sneezing and itching.
C
Mast cells suppress the immune system to prevent allergic reactions.
D
Mast cells are responsible for producing antibodies against allergens.

Which of the following graphs depicts the solar radiation variations in the tropical and temperate regions during summer and winter?

A
Graph X shows variations for the tropical region during summer, while graph Y represents the temperate region during winter.
B
Graph Y shows variations for the tropical region during summer, while graph X represents the temperate region during winter.
C
Both graphs show similar patterns for both regions throughout the year.
D
Neither graph is applicable to solar radiation variations.

Which of the following methods is most commonly used to amplify DNA in biotechnology?

A
Polymerase Chain Reaction (PCR)
B
Gel Electrophoresis
C
Gene Editing
D
Restriction Enzyme Digestion

Which of the following is NOT a feature of the engineered vector pBR322?

A
It contains a gene for antibiotic resistance.
B
It has a region for replication initiation.
C
It is used to insert foreign DNA into bacteria.
D
It is only used for plant genetic engineering.

Which of the following best describes the role of RNA in the cell?

A
RNA carries genetic information from DNA to ribosomes for protein synthesis.
B
RNA synthesizes DNA during replication.
C
RNA acts as a template for the synthesis of glucose.
D
RNA is involved in the breakdown of carbohydrates.

Which one of the following diseases is caused by a fungal infection?

A
Tuberculosis
B
Ringworm
C
Malaria
D
Cholera

In a DNA molecule, what is the purpose of the sugar-phosphate backbone?

A
It provides structural support and stability to the molecule.
B
It stores genetic information.
C
It is responsible for encoding proteins.
D
It helps in the replication of DNA.

Which of the following statements about photosynthesis is true?

A
Photosynthesis occurs only in plant cells.
B
Photosynthesis converts sunlight into energy, producing glucose.
C
Photosynthesis occurs only at night.
D
Photosynthesis uses oxygen and produces carbon dioxide.

Which process is responsible for producing the majority of ATP in a cell?

A
Fermentation
B
Glycolysis
C
Electron Transport Chain
D
Photosynthesis

What is the primary function of ribosomes in a cell?

A
Synthesize proteins
B
Store genetic information
C
Transport materials within the cell
D
Maintain cell shape

Which of the following statements about the cell cycle is correct?

A
The cell cycle includes interphase and mitosis.
B
The cell cycle only occurs in prokaryotic cells.
C
Mitosis occurs only during cell division.
D
The cell cycle has no impact on the function of the cell.

Which of the following is NOT a component of the immune system?

A
Tissues
B
Lymph nodes
C
Antibodies
D
Bone marrow

What is the role of chlorophyll in photosynthesis?

A
Chlorophyll absorbs sunlight and converts it into chemical energy.
B
Chlorophyll stores glucose.
C
Chlorophyll produces oxygen during the reaction.
D
Chlorophyll transports electrons in the electron transport chain.

Which of the following is NOT a stage of cellular respiration?

A
Krebs Cycle
B
Calvin Cycle
C
Glycolysis
D
Electron Transport Chain

Which of the following is true about meiosis?

A
Meiosis produces four genetically identical cells.
B
Meiosis is involved in the formation of gametes.
C
Meiosis occurs in somatic cells.
D
Meiosis results in two diploid daughter cells.

Which of the following is the first phase of mitosis?

A
Prophase
B
Metaphase
C
Anaphase
D
Telophase

Which of the following is a function of the circulatory system?

A
Transporting oxygen and nutrients to tissues.
B
Synthesizing proteins in the body.
C
Regulating body temperature.
D
Excreting waste products from the body.