Major Competitive Exams
Q. What is the term for the genetic variation that occurs due to random changes in DNA? (1953)
A.
Mutation
B.
Selection
C.
Migration
D.
Isolation
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Solution
Mutation refers to random changes in DNA that can lead to genetic variation within a population, which is a key factor in evolution.
Correct Answer: A — Mutation
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Q. What is the term for the gradual increase in Earth's average temperature? (2023)
A.
Climate change
B.
Global warming
C.
Greenhouse effect
D.
Ozone depletion
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Solution
Global warming refers specifically to the gradual increase in Earth's average temperature due to human activities.
Correct Answer: B — Global warming
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Q. What is the term for the gradual increase in the Earth's average temperature due to human activities?
A.
Global warming
B.
Ozone depletion
C.
Acidification
D.
Eutrophication
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Solution
Global warming refers to the gradual increase in the Earth's average temperature due to human activities, primarily the emission of greenhouse gases.
Correct Answer: A — Global warming
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Q. What is the term for the gradual increase in the Earth's average temperature? (2023)
A.
Climate change
B.
Global warming
C.
Greenhouse effect
D.
Ozone depletion
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Solution
Global warming refers specifically to the long-term rise in the average temperature of the Earth's atmosphere due to human activities.
Correct Answer: B — Global warming
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Q. What is the term for the gradual process of change and replacement in the species composition of a given area? (2022)
A.
Succession
B.
Evolution
C.
Adaptation
D.
Migration
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Solution
Succession is the process of change in the species structure of an ecological community over time.
Correct Answer: A — Succession
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Q. What is the term for the gradual process of change in species composition in a given area over time? (2019)
A.
Succession
B.
Evolution
C.
Adaptation
D.
Migration
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Solution
Succession refers to the process of change in the species structure of an ecological community over time.
Correct Answer: A — Succession
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Q. What is the term for the heat required to change a substance from solid to liquid at constant temperature? (2019)
A.
Latent heat of fusion
B.
Latent heat of vaporization
C.
Specific heat
D.
Sensible heat
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Solution
The heat required to change a substance from solid to liquid at constant temperature is called the latent heat of fusion.
Correct Answer: A — Latent heat of fusion
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Q. What is the term for the heat transfer that occurs due to the movement of a fluid?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Convection is the term used for heat transfer that occurs due to the movement of a fluid.
Correct Answer: B — Convection
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Q. What is the term for the loss of a species from a particular habitat? (2020)
A.
Extinction
B.
Endangerment
C.
Extirpation
D.
Depletion
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Solution
Extirpation refers to the loss of a species from a particular habitat, while extinction refers to the loss of a species globally.
Correct Answer: C — Extirpation
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Q. What is the term for the loss of biodiversity due to habitat destruction? (2023)
A.
Overexploitation
B.
Pollution
C.
Habitat fragmentation
D.
Extinction
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Solution
Habitat fragmentation leads to the loss of biodiversity as it divides ecosystems and isolates species.
Correct Answer: C — Habitat fragmentation
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Q. What is the term for the loss of water vapor from the aerial parts of plants? (2020)
A.
Transpiration
B.
Evaporation
C.
Condensation
D.
Respiration
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Solution
Transpiration is the process of water vapor loss from the aerial parts of plants, mainly through stomata.
Correct Answer: A — Transpiration
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Q. What is the term for the lowest frequency of a sound wave in a harmonic series?
A.
Fundamental frequency
B.
Overtone
C.
Harmonic
D.
Resonance
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Solution
The lowest frequency in a harmonic series is called the fundamental frequency.
Correct Answer: A — Fundamental frequency
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Q. What is the term for the male gamete in flowering plants? (2023)
A.
Ovule
B.
Pollen grain
C.
Seed
D.
Ovary
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Solution
The male gamete in flowering plants is contained within the pollen grain.
Correct Answer: B — Pollen grain
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Q. What is the term for the maximum amount of adsorbate that can be adsorbed on a given mass of adsorbent? (2020)
A.
Adsorption capacity
B.
Saturation point
C.
Equilibrium concentration
D.
Adsorption isotherm
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Solution
The maximum amount of adsorbate that can be adsorbed on a given mass of adsorbent is referred to as the adsorption capacity.
Correct Answer: A — Adsorption capacity
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Q. What is the term for the maximum amount of solute that can be adsorbed on a surface? (2021)
A.
Saturation point
B.
Adsorption capacity
C.
Equilibrium constant
D.
Surface tension
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Solution
The maximum amount of solute that can be adsorbed on a surface is referred to as the adsorption capacity.
Correct Answer: B — Adsorption capacity
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Q. What is the term for the maximum population size that an environment can sustain? (2020)
A.
Carrying capacity
B.
Population density
C.
Biotic potential
D.
Ecological footprint
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Solution
Carrying capacity is the maximum number of individuals of a particular species that an environment can support sustainably.
Correct Answer: A — Carrying capacity
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Q. What is the term for the measure of a fluid's resistance to flow?
A.
Density
B.
Viscosity
C.
Pressure
D.
Temperature
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Solution
Viscosity is the measure of a fluid's resistance to flow, indicating how thick or thin the fluid is.
Correct Answer: B — Viscosity
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Q. What is the term for the movement of water across a semi-permeable membrane?
A.
Diffusion
B.
Osmosis
C.
Active transport
D.
Facilitated diffusion
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Solution
Osmosis is the movement of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Correct Answer: B — Osmosis
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Q. What is the term for the movement of water through a plant against gravity?
A.
Translocation
B.
Transpiration
C.
Capillarity
D.
Hydrolysis
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Solution
Transpiration refers to the process of water movement through a plant and its evaporation from aerial parts, which helps in moving water against gravity.
Correct Answer: B — Transpiration
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Q. What is the term for the phenomenon where a liquid's surface behaves like a stretched elastic membrane?
A.
Surface Tension
B.
Capillarity
C.
Viscosity
D.
Hydrostatic Pressure
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Solution
Surface tension is the phenomenon where a liquid's surface behaves like a stretched elastic membrane due to cohesive forces.
Correct Answer: A — Surface Tension
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Q. What is the term for the pressure exerted by a fluid at rest?
A.
Dynamic pressure
B.
Static pressure
C.
Hydrostatic pressure
D.
Atmospheric pressure
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Solution
Hydrostatic pressure is the pressure exerted by a fluid at rest due to the weight of the fluid above it.
Correct Answer: C — Hydrostatic pressure
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Q. What is the term for the pressure exerted by a vapor in equilibrium with its liquid?
A.
Saturation pressure
B.
Vapor pressure
C.
Boiling point
D.
Critical pressure
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Solution
Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid.
Correct Answer: B — Vapor pressure
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Q. What is the term for the process by which a liquid changes into a gas?
A.
Condensation
B.
Evaporation
C.
Sublimation
D.
Deposition
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Solution
Evaporation is the process by which a liquid changes into a gas.
Correct Answer: B — Evaporation
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Q. What is the term for the process by which a liquid changes to a gas?
A.
Condensation
B.
Evaporation
C.
Sublimation
D.
Deposition
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Solution
Evaporation is the process by which a liquid changes to a gas.
Correct Answer: B — Evaporation
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Q. What is the term for the process by which a liquid turns into vapor?
A.
Condensation
B.
Evaporation
C.
Sublimation
D.
Deposition
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Solution
Evaporation is the process by which a liquid turns into vapor.
Correct Answer: B — Evaporation
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Q. What is the term for the process by which living organisms maintain a stable internal environment? (2019)
A.
Metabolism
B.
Homeostasis
C.
Reproduction
D.
Adaptation
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Solution
Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.
Correct Answer: B — Homeostasis
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Q. What is the term for the process by which plants absorb carbon dioxide from the atmosphere?
A.
Respiration
B.
Photosynthesis
C.
Transpiration
D.
Evaporation
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Solution
Photosynthesis is the process by which plants absorb carbon dioxide (CO2) from the atmosphere and convert it into glucose.
Correct Answer: B — Photosynthesis
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Q. What is the term for the process by which plants absorb carbon dioxide?
A.
Respiration
B.
Photosynthesis
C.
Transpiration
D.
Evaporation
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Solution
Photosynthesis is the process by which plants absorb carbon dioxide and convert it into glucose and oxygen using sunlight.
Correct Answer: B — Photosynthesis
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Q. What is the term for the process by which pollutants are absorbed by living organisms?
A.
Bioaccumulation
B.
Biodegradation
C.
Biomagnification
D.
Bioremediation
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Solution
Bioaccumulation refers to the process by which pollutants accumulate in the tissues of living organisms.
Correct Answer: A — Bioaccumulation
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Q. What is the term for the process by which water vapor turns into liquid water?
A.
Evaporation
B.
Condensation
C.
Precipitation
D.
Transpiration
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Solution
The process by which water vapor turns into liquid water is called Condensation.
Correct Answer: B — Condensation
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