Q. Which of the following polymers is used in the making of rubber? (2019)
A.
Polyethylene
B.
Natural rubber
C.
Polystyrene
D.
Polyvinyl acetate
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Solution
Natural rubber is a polymer made from the latex of rubber trees and is widely used in the production of rubber products.
Correct Answer:
B
— Natural rubber
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Q. Which of the following polymers is used in the manufacture of rubber? (2019)
A.
Polyethylene
B.
Natural rubber
C.
Polystyrene
D.
Polyvinyl acetate
Show solution
Solution
Natural rubber is a polymer made from the latex of rubber trees and is widely used in the manufacture of rubber products.
Correct Answer:
B
— Natural rubber
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Q. Which of the following polymers is used in the production of rubber? (2019)
A.
Polyethylene
B.
Natural rubber
C.
Polystyrene
D.
Polyvinyl acetate
Show solution
Solution
Natural rubber is a polymer made from the latex of rubber trees and is widely used in the production of rubber products.
Correct Answer:
B
— Natural rubber
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Q. Which of the following practices can help conserve biodiversity? (2021)
A.
Deforestation
B.
Overfishing
C.
Sustainable tourism
D.
Pollution
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Solution
Sustainable tourism can help conserve biodiversity by promoting responsible travel that does not harm ecosystems.
Correct Answer:
C
— Sustainable tourism
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Q. Which of the following practices can help in conserving biodiversity? (2021)
A.
Monoculture farming
B.
Deforestation
C.
Sustainable agriculture
D.
Urbanization
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Solution
Sustainable agriculture practices help in conserving biodiversity by maintaining healthy ecosystems.
Correct Answer:
C
— Sustainable agriculture
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Q. Which of the following practices can help reduce soil erosion? (2022)
A.
Overgrazing
B.
Crop rotation
C.
Deforestation
D.
Urbanization
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Solution
Crop rotation helps maintain soil health and reduces soil erosion by preventing nutrient depletion.
Correct Answer:
B
— Crop rotation
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Q. Which of the following practices can lead to habitat fragmentation? (2021)
A.
Urban development
B.
Reforestation
C.
Sustainable agriculture
D.
Wildlife corridors
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Solution
Urban development can lead to habitat fragmentation by dividing ecosystems into smaller, isolated patches.
Correct Answer:
A
— Urban development
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Q. Which of the following processes can lead to speciation? (1990)
A.
Geographic isolation
B.
Behavioral isolation
C.
Temporal isolation
D.
All of the above
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Solution
Speciation can occur through various processes, including geographic, behavioral, and temporal isolation, leading to the formation of new species.
Correct Answer:
D
— All of the above
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Q. Which of the following processes has a positive change in entropy? (2023)
A.
Freezing of water
B.
Condensation of steam
C.
Sublimation of dry ice
D.
Melting of ice
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Solution
The melting of ice has a positive change in entropy as the solid structure becomes more disordered in the liquid state.
Correct Answer:
D
— Melting of ice
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Q. Which of the following processes increases the entropy of the system? (2022)
A.
Freezing of water
B.
Melting of ice
C.
Condensation of steam
D.
Compression of gas
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Solution
The melting of ice increases the entropy of the system as it transitions from a solid to a liquid state, which has more disorder.
Correct Answer:
B
— Melting of ice
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Q. Which of the following processes involves a change from gas to liquid?
A.
Sublimation
B.
Condensation
C.
Evaporation
D.
Freezing
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Solution
Condensation is the process where gas changes to liquid.
Correct Answer:
B
— Condensation
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Q. Which of the following processes involves a change of state without a change in temperature? (2018)
A.
Heating
B.
Cooling
C.
Melting
D.
Boiling
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Solution
Melting involves a change of state (solid to liquid) without a change in temperature.
Correct Answer:
C
— Melting
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Q. Which of the following processes involves the conversion of mRNA into a protein? (2022)
A.
Transcription
B.
Translation
C.
Replication
D.
Translocation
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Solution
Translation is the process where mRNA is decoded to produce a protein.
Correct Answer:
B
— Translation
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Q. Which of the following processes involves the emission of a positron? (2019)
A.
Alpha decay
B.
Beta decay
C.
Gamma decay
D.
Neutron capture
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Solution
Beta decay involves the emission of a positron, which is the antimatter counterpart of an electron.
Correct Answer:
B
— Beta decay
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Q. Which of the following processes involves the synthesis of proteins? (2022)
A.
Replication
B.
Transcription
C.
Translation
D.
Translocation
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Solution
Translation is the process that involves the synthesis of proteins from mRNA.
Correct Answer:
C
— Translation
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Q. Which of the following processes involves the transfer of genetic material between bacteria? (2022)
A.
Transcription
B.
Translation
C.
Transformation
D.
Transduction
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Solution
Transformation is the process by which bacteria take up foreign DNA from their environment.
Correct Answer:
C
— Transformation
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Q. Which of the following processes involves the transfer of heat through a fluid? (2021)
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Convection is the process that involves the transfer of heat through a fluid (liquid or gas) due to the movement of the fluid itself.
Correct Answer:
B
— Convection
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Q. Which of the following processes involves the transfer of heat through the movement of fluids? (2021)
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Convection involves the transfer of heat through the movement of fluids.
Correct Answer:
B
— Convection
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Q. Which of the following processes is an example of an isochoric process? (2023)
A.
Heating a gas in a closed container
B.
Compressing a gas in a piston
C.
Expanding a gas against a constant pressure
D.
Cooling a gas at constant pressure
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Solution
An isochoric process is one where the volume remains constant, such as heating a gas in a closed container.
Correct Answer:
A
— Heating a gas in a closed container
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Q. Which of the following processes is directly influenced by auxins? (2021)
A.
Phototropism
B.
Photosynthesis
C.
Respiration
D.
Transpiration
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Solution
Auxins are responsible for phototropism, the growth of plants towards light.
Correct Answer:
A
— Phototropism
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Q. Which of the following processes is influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
All of the above
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Solution
Auxins influence various processes including phototropism, gravitropism, and apical dominance.
Correct Answer:
D
— All of the above
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Q. Which of the following processes is irreversible? (2022)
A.
Isothermal expansion
B.
Adiabatic expansion
C.
Free expansion
D.
Isobaric process
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Solution
Free expansion is an irreversible process as it occurs without any external pressure acting on the gas.
Correct Answer:
C
— Free expansion
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Q. Which of the following processes is isochoric? (2023)
A.
Constant volume
B.
Constant pressure
C.
Constant temperature
D.
Adiabatic
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Solution
An isochoric process is one that occurs at constant volume.
Correct Answer:
A
— Constant volume
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Q. Which of the following processes is NOT directly influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
Photosynthesis
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Solution
Photosynthesis is not directly influenced by auxins; they mainly affect growth and development processes.
Correct Answer:
D
— Photosynthesis
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Q. Which of the following processes is NOT influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
Fruit ripening
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Solution
Fruit ripening is primarily influenced by ethylene, not auxins.
Correct Answer:
D
— Fruit ripening
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Q. Which of the following processes is NOT influenced by plant hormones? (2021)
A.
Seed germination
B.
Fruit ripening
C.
Photosynthesis
D.
Flowering
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Solution
Photosynthesis is a biochemical process that is not directly influenced by plant hormones.
Correct Answer:
C
— Photosynthesis
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Q. Which of the following processes is primarily regulated by auxins? (2021)
A.
Phototropism
B.
Photosynthesis
C.
Respiration
D.
Transpiration
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Solution
Auxins are primarily responsible for phototropism, the growth of plants towards light.
Correct Answer:
A
— Phototropism
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Q. Which of the following processes occurs during aerobic respiration in plants? (2020)
A.
Fermentation
B.
Glycolysis
C.
Anaerobic respiration
D.
Photosynthesis
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Solution
Glycolysis is the first step in aerobic respiration, where glucose is broken down to produce energy.
Correct Answer:
B
— Glycolysis
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Q. Which of the following processes occurs during expiration? (2023)
A.
Diaphragm contracts
B.
Intercostal muscles relax
C.
Lungs expand
D.
Air is drawn in
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Solution
During expiration, the diaphragm relaxes and the intercostal muscles also relax, leading to a decrease in thoracic volume and expulsion of air from the lungs.
Correct Answer:
B
— Intercostal muscles relax
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Q. Which of the following processes occurs during the light-dependent reactions of photosynthesis? (2020)
A.
Calvin cycle
B.
Photolysis of water
C.
Carbon fixation
D.
Synthesis of glucose
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Solution
Photolysis of water occurs during the light-dependent reactions, producing oxygen and electrons.
Correct Answer:
B
— Photolysis of water
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