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 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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Q. Which of the following processes occurs in the thylakoid membranes of chloroplasts? (2020)
A.
Calvin cycle
B.
Light-dependent reactions
C.
Light-independent reactions
D.
Photorespiration
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Solution
The light-dependent reactions of photosynthesis occur in the thylakoid membranes.
Correct Answer: B — Light-dependent reactions
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Q. Which of the following processes occurs in the thylakoid membranes? (2020)
A.
Calvin cycle
B.
Light-dependent reactions
C.
Light-independent reactions
D.
Photorespiration
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Solution
The light-dependent reactions of photosynthesis occur in the thylakoid membranes.
Correct Answer: B — Light-dependent reactions
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Q. Which of the following properties is characteristic of covalent network solids? (2019)
A.
High electrical conductivity
B.
Brittleness
C.
Low melting points
D.
Solubility in water
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Solution
Covalent network solids are typically brittle due to the strong covalent bonds that do not allow for easy deformation.
Correct Answer: B — Brittleness
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Q. Which of the following properties is characteristic of ionic solids? (2021)
A.
High electrical conductivity
B.
Low melting point
C.
Brittleness
D.
Malleability
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Solution
Ionic solids are typically brittle due to the strong electrostatic forces between the ions, which cause them to shatter when force is applied.
Correct Answer: C — Brittleness
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Q. Which of the following properties is typical of metallic solids? (2019)
A.
Brittleness
B.
Electrical conductivity
C.
Low melting point
D.
Insulating nature
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Solution
Metallic solids are known for their high electrical conductivity due to the presence of free-moving electrons.
Correct Answer: B — Electrical conductivity
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Q. Which of the following provides evidence for evolution through common descent? (2010)
A.
Fossil records
B.
Homologous structures
C.
Vestigial organs
D.
All of the above
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Solution
All of the above options provide evidence for evolution through common descent, showing how different species share common ancestors.
Correct Answer: D — All of the above
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Q. Which of the following quantities has dimensions of M^0L^2T^-2? (2021)
A.
Energy
B.
Pressure
C.
Area
D.
Velocity
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Solution
Area has dimensions of M^0L^2T^-2.
Correct Answer: C — Area
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Q. Which of the following quantities has no dimension? (2023)
A.
Angle
B.
Force
C.
Velocity
D.
Acceleration
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Solution
Angle is a dimensionless quantity.
Correct Answer: A — Angle
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Q. Which of the following quantities has the dimension M^0L^1T^-1? (2021)
A.
Velocity
B.
Acceleration
C.
Force
D.
Work
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Solution
Velocity has the dimension M^0L^1T^-1.
Correct Answer: A — Velocity
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Q. Which of the following quantities has the dimension M^1L^2T^-2? (2019)
A.
Work
B.
Power
C.
Energy
D.
Force
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Solution
Work has the dimension M^1L^2T^-2.
Correct Answer: A — Work
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Q. Which of the following quantities is a vector? (2019)
A.
Speed
B.
Distance
C.
Displacement
D.
Mass
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Solution
Displacement is a vector quantity as it has both magnitude and direction, while speed, distance, and mass are scalar quantities.
Correct Answer: C — Displacement
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Q. Which of the following quantities is conserved in an isolated system? (2023)
A.
Energy
B.
Momentum
C.
Mass
D.
All of the above
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Solution
In an isolated system, energy, momentum, and mass are all conserved.
Correct Answer: D — All of the above
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Q. Which of the following quantum numbers describes the shape of an atomic orbital? (2022)
A.
Principal quantum number
B.
Azimuthal quantum number
C.
Magnetic quantum number
D.
Spin quantum number
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Solution
The azimuthal quantum number (l) describes the shape of the atomic orbital.
Correct Answer: B — Azimuthal quantum number
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Q. Which of the following reactions is an example of a disproportionation reaction? (2023)
A.
2H2O2 → 2H2O + O2
B.
2Na + Cl2 → 2NaCl
C.
Zn + CuSO4 → ZnSO4 + Cu
D.
Fe + 2HCl → FeCl2 + H2
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Solution
In the reaction 2H2O2 → 2H2O + O2, the oxidation state of oxygen changes from -1 in H2O2 to 0 in O2, indicating that it is both oxidized and reduced.
Correct Answer: A — 2H2O2 → 2H2O + O2
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Q. Which of the following reactions is an example of a redox reaction? (2023)
A.
H2 + Cl2 → 2HCl
B.
NaOH + HCl → NaCl + H2O
C.
CaCO3 → CaO + CO2
D.
C + O2 → CO2
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Solution
The reaction C + O2 → CO2 is a redox reaction because carbon is oxidized and oxygen is reduced.
Correct Answer: D — C + O2 → CO2
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Q. Which of the following reactions is an example of hydrogenation? (2023)
A.
Addition of H2 to ethene
B.
Decomposition of water
C.
Formation of ammonia from nitrogen and hydrogen
D.
Combustion of hydrogen
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Solution
Hydrogenation refers to the addition of hydrogen (H2) to unsaturated hydrocarbons, such as the addition to ethene to form ethane.
Correct Answer: A — Addition of H2 to ethene
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Q. Which of the following reactions is characteristic of aldehydes? (2023)
A.
Oxidation to carboxylic acids
B.
Reduction to alcohols
C.
Condensation with alcohols
D.
All of the above
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Solution
Aldehydes can undergo oxidation to form carboxylic acids, reduction to form alcohols, and condensation with alcohols to form hemiacetals.
Correct Answer: D — All of the above
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Q. Which of the following represents a homozygous dominant genotype? (2021)
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Solution
The genotype 'AA' represents a homozygous dominant individual.
Correct Answer: A — AA
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Q. Which of the following represents a phenotype? (2021)
A.
BB
B.
Bb
C.
bb
D.
Brown eyes
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Solution
A phenotype is the observable characteristic, such as brown eyes.
Correct Answer: D — Brown eyes
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Q. Which of the following represents a systematic error? (2020)
A.
Calibration error
B.
Random fluctuations
C.
Environmental changes
D.
Human error
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Solution
Systematic errors are consistent and repeatable inaccuracies, often due to calibration errors.
Correct Answer: A — Calibration error
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Q. Which of the following represents a test cross? (2020)
A.
AA x aa
B.
Aa x Aa
C.
AA x Aa
D.
aa x aa
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Solution
A test cross is performed by crossing an individual with a homozygous recessive individual (AA x aa) to determine the genotype of the former.
Correct Answer: A — AA x aa
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Q. Which of the following represents the concept of significant figures? (2023)
A.
All digits in a number
B.
Only the non-zero digits
C.
All digits except leading zeros
D.
All digits except trailing zeros
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Solution
Significant figures include all non-zero digits and any zeros between them or trailing after a decimal point.
Correct Answer: C — All digits except leading zeros
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