Q. Which of the following organisms reproduces asexually by budding? (2021)
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A.
Hydra
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B.
Frog
-
C.
Human
-
D.
Mango tree
Solution
Hydra reproduces asexually by the process of budding, where a new individual develops from an outgrowth of the parent.
Correct Answer: A — Hydra
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Q. Which of the following organisms reproduces by budding? (2023)
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A.
Planaria
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B.
Hydra
-
C.
Bacteria
-
D.
Fungi
Solution
Budding is a form of asexual reproduction seen in organisms like Hydra, where a new individual develops from an outgrowth.
Correct Answer: B — Hydra
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Q. Which of the following organisms reproduces by fragmentation? (2022)
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A.
Starfish
-
B.
Mammals
-
C.
Birds
-
D.
Fungi
Solution
Starfish can reproduce by fragmentation, where a part of the organism can grow into a new individual.
Correct Answer: A — Starfish
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Q. Which of the following organisms reproduces by parthenogenesis? (2022)
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A.
Honeybee
-
B.
Frog
-
C.
Lizard
-
D.
Human
Solution
Honeybees can reproduce by parthenogenesis, where an egg develops into an organism without fertilization.
Correct Answer: A — Honeybee
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Q. Which of the following organisms reproduces sexually? (2023)
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A.
Bacteria
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B.
Fungi
-
C.
Mammals
-
D.
All of the above
Solution
Mammals reproduce sexually, while bacteria typically reproduce asexually, and fungi can reproduce both sexually and asexually.
Correct Answer: C — Mammals
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Q. Which of the following organisms reproduces through parthenogenesis? (2020)
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A.
Honeybee
-
B.
Frog
-
C.
Human
-
D.
Goldfish
Solution
Honeybees can reproduce through parthenogenesis, where unfertilized eggs develop into new individuals.
Correct Answer: A — Honeybee
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Q. Which of the following oxides is amphoteric? (2019)
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A.
Na2O
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B.
MgO
-
C.
Al2O3
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D.
SiO2
Solution
Al2O3 is an amphoteric oxide, reacting with both acids and bases.
Correct Answer: C — Al2O3
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Q. Which of the following phenomena is NOT associated with waves? (2023)
-
A.
Interference
-
B.
Diffraction
-
C.
Refraction
-
D.
Conduction
Solution
Conduction is a mode of heat transfer and is not associated with wave phenomena.
Correct Answer: D — Conduction
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Q. Which of the following phenomena is responsible for the bending of light when it passes from one medium to another? (2020)
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A.
Reflection
-
B.
Refraction
-
C.
Diffraction
-
D.
Dispersion
Solution
Refraction is the bending of light as it passes from one medium to another due to a change in its speed.
Correct Answer: B — Refraction
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Q. Which of the following phenomena is responsible for the blue color of the sky? (2022)
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A.
Reflection
-
B.
Refraction
-
C.
Diffraction
-
D.
Rayleigh scattering
Solution
The blue color of the sky is primarily due to Rayleigh scattering, which scatters shorter wavelengths of light more than longer wavelengths.
Correct Answer: D — Rayleigh scattering
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Q. Which of the following plant groups is known for having a life cycle that includes alternation of generations? (2022)
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A.
Angiosperms
-
B.
Gymnosperms
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C.
Pteridophytes
-
D.
All of the above
Solution
All of the mentioned groups (Angiosperms, Gymnosperms, and Pteridophytes) exhibit alternation of generations in their life cycles.
Correct Answer: D — All of the above
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Q. Which of the following plant groups is known for having a life cycle that includes both gametophyte and sporophyte generations? (2021)
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A.
Angiosperms
-
B.
Gymnosperms
-
C.
Pteridophytes
-
D.
All of the above
Solution
Pteridophytes, like ferns, exhibit an alternation of generations with both gametophyte and sporophyte stages.
Correct Answer: C — Pteridophytes
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Q. Which of the following polymers is used in the making of rubber? (2019)
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A.
Polyethylene
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B.
Natural rubber
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C.
Polystyrene
-
D.
Polyvinyl acetate
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
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
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)
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A.
Deforestation
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B.
Overfishing
-
C.
Sustainable tourism
-
D.
Pollution
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)
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A.
Monoculture farming
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B.
Deforestation
-
C.
Sustainable agriculture
-
D.
Urbanization
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)
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A.
Overgrazing
-
B.
Crop rotation
-
C.
Deforestation
-
D.
Urbanization
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 processes can lead to speciation? (1990)
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A.
Geographic isolation
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B.
Behavioral isolation
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C.
Temporal isolation
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D.
All of the above
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 increases the entropy of the system? (2022)
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A.
Freezing of water
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B.
Melting of ice
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C.
Condensation of steam
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D.
Compression of gas
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 of state without a change in temperature? (2018)
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A.
Heating
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B.
Cooling
-
C.
Melting
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D.
Boiling
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)
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A.
Transcription
-
B.
Translation
-
C.
Replication
-
D.
Translocation
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)
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A.
Alpha decay
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B.
Beta decay
-
C.
Gamma decay
-
D.
Neutron capture
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)
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A.
Replication
-
B.
Transcription
-
C.
Translation
-
D.
Translocation
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
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)
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A.
Conduction
-
B.
Convection
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C.
Radiation
-
D.
Insulation
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
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 directly influenced by auxins? (2021)
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A.
Phototropism
-
B.
Photosynthesis
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C.
Respiration
-
D.
Transpiration
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
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 NOT directly influenced by auxins? (2021)
-
A.
Phototropism
-
B.
Gravitropism
-
C.
Apical dominance
-
D.
Photosynthesis
Solution
Photosynthesis is not directly influenced by auxins; they mainly affect growth and development processes.
Correct Answer: D — Photosynthesis
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