Undergraduate
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 due to human activities? (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 Earth's average surface temperature due to human activities.
Correct Answer: B — Global warming
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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? (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 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 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 male reproductive part of a flower? (2023)
A.
Pistil
B.
Stamen
C.
Ovary
D.
Style
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Solution
The stamen is the male reproductive part of the flower, consisting of the anther and filament.
Correct Answer: B — Stamen
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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 adsorbate that can be adsorbed on a unit mass of adsorbent? (2020)
A.
Adsorption capacity
B.
Adsorption isotherm
C.
Saturation point
D.
Adsorption efficiency
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Solution
The maximum amount of adsorbate that can be adsorbed on a unit 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 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 movement of water through a plant from roots to leaves?
A.
Translocation
B.
Transpiration
C.
Absorption
D.
Evaporation
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Solution
Translocation refers to the movement of water and nutrients through the plant, specifically from roots to leaves.
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 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 of forming gametes? (2021)
A.
Mitosis
B.
Meiosis
C.
Fertilization
D.
Budding
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Solution
Meiosis is the process that leads to the formation of gametes, reducing the chromosome number by half.
Correct Answer: B — Meiosis
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Q. What is the term for the process of urine formation? (2020)
A.
Filtration
B.
Reabsorption
C.
Secretion
D.
All of the above
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Solution
Urine formation involves filtration, reabsorption, and secretion processes in the nephron.
Correct Answer: D — All of the above
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Q. What is the term for the process where a solid adsorbs a liquid or gas? (2022)
A.
Absorption
B.
Adsorption
C.
Desorption
D.
Sorption
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Solution
Adsorption is the process where a solid attracts and holds molecules of a liquid or gas on its surface.
Correct Answer: B — Adsorption
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Q. What is the term for the temperature at which a substance changes from liquid to gas? (2023)
A.
Melting point
B.
Boiling point
C.
Freezing point
D.
Sublimation point
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Solution
The temperature at which a substance changes from liquid to gas is called the boiling point.
Correct Answer: B — Boiling point
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Q. What is the term for the transfer of pollen from anther to stigma? (2020)
A.
Fertilization
B.
Pollination
C.
Germination
D.
Propagation
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Solution
The transfer of pollen from the anther to the stigma is called pollination.
Correct Answer: B — Pollination
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Q. What is the term for the transfer of pollen from the anther to the stigma of the same flower? (2019)
A.
Self-pollination
B.
Cross-pollination
C.
Autogamy
D.
Geitonogamy
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Solution
Self-pollination refers to the transfer of pollen from the anther to the stigma of the same flower, leading to fertilization.
Correct Answer: A — Self-pollination
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Q. What is the term for the variety of life in the world or in a particular habitat or ecosystem? (2020)
A.
Biodiversity
B.
Ecology
C.
Biogeography
D.
Conservation
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Solution
Biodiversity refers to the variety of life in the world or in a particular habitat or ecosystem, encompassing species diversity, genetic diversity, and ecosystem diversity.
Correct Answer: A — Biodiversity
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Q. What is the term for the volume of air that can be forcibly exhaled after a normal exhalation? (2023)
A.
Tidal volume
B.
Vital capacity
C.
Expiratory reserve volume
D.
Inspiratory reserve volume
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Solution
Expiratory reserve volume is the amount of air that can be forcibly exhaled after the end of a normal exhalation.
Correct Answer: C — Expiratory reserve volume
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Q. What is the term independent of x in the expansion of (2x - 3)^8?
A.
-256
B.
256
C.
-512
D.
512
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Solution
The term independent of x is given by C(8,4) * (2x)^4 * (-3)^4 = 70 * 16 * 81 = -256.
Correct Answer: A — -256
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