Q. Which process is responsible for the movement of water across a semipermeable membrane? (2020)
A.
Diffusion
B.
Osmosis
C.
Active transport
D.
Facilitated diffusion
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Solution
Osmosis is the process of movement of water across a semipermeable membrane.
Correct Answer: B — Osmosis
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Q. Which process is used by cells to obtain energy from glucose? (2022)
A.
Photosynthesis
B.
Fermentation
C.
Cellular respiration
D.
Transpiration
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Solution
Cells obtain energy from glucose through the process of cellular respiration.
Correct Answer: C — Cellular respiration
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Q. Which property of a material describes its ability to return to its original shape after deformation? (2023)
A.
Plasticity
B.
Elasticity
C.
Ductility
D.
Brittleness
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Solution
Elasticity is the property that allows a material to return to its original shape after deformation.
Correct Answer: B — Elasticity
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Q. Which property of fluids is defined as the resistance to flow?
A.
Density
B.
Viscosity
C.
Pressure
D.
Surface Tension
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Solution
Viscosity is the property of fluids that describes their resistance to flow.
Correct Answer: B — Viscosity
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Q. Which protein forms the thick filaments in muscle fibers? (2020)
A.
A. Actin
B.
B. Myosin
C.
C. Tropomyosin
D.
D. Troponin
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Solution
Myosin forms the thick filaments in muscle fibers and interacts with actin during contraction.
Correct Answer: B — B. Myosin
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Q. Which protein is primarily responsible for muscle contraction? (2019)
A.
Actin
B.
Myosin
C.
Tropomyosin
D.
Troponin
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Solution
Myosin is the primary protein that interacts with actin to facilitate muscle contraction.
Correct Answer: B — Myosin
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Q. Which quantum number is not required to describe the electron in an atom? (2019)
A.
Principal quantum number
B.
Azimuthal quantum number
C.
Magnetic quantum number
D.
Color quantum number
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Solution
Color quantum number is not a valid quantum number for describing electrons in an atom.
Correct Answer: D — Color quantum number
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Q. Which reaction is characteristic of carboxylic acids? (2021)
A.
Esterification
B.
Hydrogenation
C.
Halogenation
D.
Dehydration
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Solution
Esterification is a characteristic reaction of carboxylic acids, where they react with alcohols to form esters.
Correct Answer: A — Esterification
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Q. Which reaction is used to prepare carboxylic acids from alcohols? (2020)
A.
Oxidation
B.
Reduction
C.
Hydrolysis
D.
Dehydration
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Solution
Oxidation of alcohols leads to the formation of carboxylic acids.
Correct Answer: A — Oxidation
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Q. Which reaction is used to prepare primary amines from alkyl halides? (2022)
A.
Reduction
B.
Hydrolysis
C.
Nucleophilic substitution
D.
Dehydrohalogenation
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Solution
Primary amines can be prepared from alkyl halides through nucleophilic substitution reactions with ammonia.
Correct Answer: C — Nucleophilic substitution
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Q. Which reagent is used to convert an alcohol into an alkyl halide? (2022)
A.
PCl5
B.
NaBH4
C.
LiAlH4
D.
H2SO4
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Solution
PCl5 is commonly used to convert alcohols into alkyl halides through a substitution reaction.
Correct Answer: A — PCl5
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Q. Which reagent is used to convert an amine to an amide? (2023)
A.
Acid chloride
B.
Alcohol
C.
Aldehyde
D.
Ketone
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Solution
An acid chloride is used to convert an amine to an amide through acylation.
Correct Answer: A — Acid chloride
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Q. Which respiratory process occurs in the alveoli? (2023)
A.
Inhalation
B.
Exhalation
C.
Gas exchange
D.
Ventilation
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Solution
Gas exchange occurs in the alveoli, where oxygen is absorbed into the blood and carbon dioxide is released from the blood.
Correct Answer: C — Gas exchange
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Q. Which scientist is known for the discovery of the structure of DNA? (2017)
A.
Gregor Mendel
B.
James Watson
C.
Francis Crick
D.
Both James Watson and Francis Crick
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Solution
James Watson and Francis Crick are credited with the discovery of the double helix structure of DNA.
Correct Answer: D — Both James Watson and Francis Crick
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Q. Which scientist is known for the double helix model of DNA? (2017)
A.
Gregor Mendel
B.
James Watson
C.
Francis Crick
D.
Rosalind Franklin
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Solution
James Watson, along with Francis Crick, is credited with the discovery of the double helix structure of DNA.
Correct Answer: B — James Watson
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Q. Which scientist is known for the structure of DNA? (2017)
A.
Gregor Mendel
B.
James Watson
C.
Francis Crick
D.
Both James Watson and Francis Crick
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Solution
James Watson and Francis Crick are credited with the discovery of the double helix structure of DNA.
Correct Answer: D — Both James Watson and Francis Crick
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Q. Which scientist is known for the theory of inheritance of acquired characteristics?
A.
Darwin
B.
Mendel
C.
Lamarck
D.
Wallace
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Solution
Jean-Baptiste Lamarck is known for proposing the theory of inheritance of acquired characteristics, which suggests that traits acquired during an organism's lifetime can be passed to offspring.
Correct Answer: C — Lamarck
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Q. Which scientist is known for the theory of punctuated equilibrium? (1972)
A.
Charles Darwin
B.
Stephen Jay Gould
C.
Jean-Baptiste Lamarck
D.
Gregor Mendel
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Solution
Stephen Jay Gould, along with Niles Eldredge, proposed the theory of punctuated equilibrium, which suggests that species remain relatively stable for long periods and then undergo rapid changes.
Correct Answer: B — Stephen Jay Gould
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Q. Which state of matter has the highest density under normal conditions? (2023)
A.
Gas
B.
Liquid
C.
Solid
D.
Plasma
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Solution
Solids generally have the highest density due to closely packed particles.
Correct Answer: C — Solid
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Q. Which structure connects muscle to bone? (2022)
A.
Ligament
B.
Tendon
C.
Cartilage
D.
Fascia
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Solution
Tendons are the structures that connect muscles to bones, facilitating movement.
Correct Answer: B — Tendon
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Q. Which structure connects muscles to bones? (2022)
A.
Ligaments
B.
Tendons
C.
Cartilage
D.
Fascia
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Solution
Tendons are the structures that connect muscles to bones, enabling movement.
Correct Answer: B — Tendons
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Q. Which structure connects the ovaries to the uterus? (2020)
A.
Vagina
B.
Cervix
C.
Fallopian tubes
D.
Endometrium
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Solution
The fallopian tubes connect the ovaries to the uterus and are the site where fertilization typically occurs.
Correct Answer: C — Fallopian tubes
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Q. Which structure develops into a seed after fertilization? (2023)
A.
Ovary
B.
Stigma
C.
Style
D.
Anther
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Solution
The ovary develops into a seed after fertilization, containing the ovules that become seeds.
Correct Answer: A — Ovary
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Q. Which structure in plants is primarily responsible for the uptake of water? (2021)
A.
Stomata
B.
Root hairs
C.
Xylem vessels
D.
Phloem tubes
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Solution
Root hairs increase the surface area for water absorption from the soil.
Correct Answer: B — Root hairs
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Q. Which structure in the female reproductive system is responsible for the production of eggs? (2022)
A.
Uterus
B.
Ovary
C.
Fallopian tube
D.
Vagina
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Solution
The ovaries are responsible for the production of eggs (ova) in the female reproductive system.
Correct Answer: B — Ovary
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Q. Which structure in the female reproductive system is responsible for the release of eggs? (2022)
A.
Ovary
B.
Uterus
C.
Fallopian tube
D.
Vagina
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Solution
The ovaries are responsible for the release of eggs during the menstrual cycle.
Correct Answer: A — Ovary
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Q. Which structure in the flower contains the ovules? (2019)
A.
Anther
B.
Filament
C.
Ovary
D.
Style
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Solution
The ovary contains the ovules, which develop into seeds after fertilization.
Correct Answer: C — Ovary
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Q. Which structure in the flower contains the pollen grains? (2019)
A.
Ovary
B.
Style
C.
Anther
D.
Stigma
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Solution
The anther is the structure in the flower that contains the pollen grains.
Correct Answer: C — Anther
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Q. Which structure in the flower develops into seeds after fertilization? (2023)
A.
Ovary
B.
Stigma
C.
Anther
D.
Filament
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Solution
The ovary develops into seeds after fertilization.
Correct Answer: A — Ovary
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Q. Which structure in the flower is responsible for producing ovules? (2023)
A.
Anther
B.
Ovary
C.
Filament
D.
Stigma
Show solution
Solution
The ovary contains ovules, which develop into seeds after fertilization.
Correct Answer: B — Ovary
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