Undergraduate
Q. Which of the following is an example of a dihybrid cross? (2019)
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A.
Aa x Aa
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B.
AaBb x AaBb
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C.
AA x aa
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D.
Aa x aa
Solution
A dihybrid cross involves two traits, and AaBb x AaBb is an example of such a cross.
Correct Answer: B — AaBb x AaBb
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Q. Which of the following is an example of a genetically modified organism used in agriculture? (2023)
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A.
Golden rice
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B.
Organic wheat
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C.
Traditional maize
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D.
Heritage tomatoes
Solution
Golden rice is a genetically modified organism enriched with vitamin A to combat malnutrition.
Correct Answer: A — Golden rice
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Q. Which of the following is an example of a genetically modified organism? (2021)
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A.
Organic tomatoes
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B.
Bt corn
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C.
Heritage wheat
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D.
Wild strawberries
Solution
Bt corn is genetically modified to express a bacterial protein that provides resistance to certain pests.
Correct Answer: B — Bt corn
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Q. Which of the following is an example of a keystone species? (2018)
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A.
Elephants
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B.
Rabbits
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C.
Deer
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D.
Sparrows
Solution
Elephants are considered a keystone species because they play a critical role in maintaining the structure of their ecosystem.
Correct Answer: A — Elephants
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Q. Which of the following is an example of a longitudinal wave? (2023)
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A.
Light wave
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B.
Sound wave
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C.
Water wave
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D.
Seismic S-wave
Solution
A sound wave is an example of a longitudinal wave, where the particle displacement is parallel to the direction of wave propagation.
Correct Answer: B — Sound wave
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Q. Which of the following is an example of a lyophilic colloid? (2021)
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A.
Starch in water
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B.
Smoke in air
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C.
Milk
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D.
Dust in air
Solution
Starch in water is a lyophilic colloid as it has a strong affinity for the solvent.
Correct Answer: A — Starch in water
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Q. Which of the following is an example of a molecular solid? (2023)
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A.
NaCl
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B.
Diamond
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C.
Iodine (I2)
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D.
Iron (Fe)
Solution
Iodine (I2) is an example of a molecular solid, where molecules are held together by van der Waals forces.
Correct Answer: C — Iodine (I2)
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Q. Which of the following is an example of a mutualistic relationship? (2023)
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A.
Bees pollinating flowers
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B.
Lions hunting zebras
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C.
Moss growing on a tree
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D.
Birds nesting in trees
Solution
Bees pollinating flowers is a mutualistic relationship where both species benefit from the interaction.
Correct Answer: A — Bees pollinating flowers
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Q. Which of the following is an example of a natural sweetener? (2021)
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A.
Aspartame
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B.
Stevia
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C.
Sucralose
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D.
Saccharin
Solution
Stevia is a natural sweetener derived from the leaves of the Stevia rebaudiana plant, making it a healthier alternative to synthetic sweeteners.
Correct Answer: B — Stevia
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Q. Which of the following is an example of a non-renewable energy source? (2017)
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A.
Solar energy
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B.
Wind energy
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C.
Natural gas
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D.
Hydropower
Solution
Natural gas is a non-renewable energy source as it is derived from fossil fuels that cannot be replenished in a short time.
Correct Answer: C — Natural gas
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Q. Which of the following is an example of a non-stoichiometric solid? (2023)
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A.
NaCl
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B.
FeO
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C.
MgO
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D.
KCl
Solution
FeO is an example of a non-stoichiometric solid because it can have varying ratios of iron and oxygen.
Correct Answer: B — FeO
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Q. Which of the following is an example of a plasma? (2023)
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A.
Ice
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B.
Water
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C.
Steam
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D.
Lightning
Solution
Lightning is an example of plasma, which is a state of matter consisting of ionized gas with free electrons.
Correct Answer: D — Lightning
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Q. Which of the following is an example of a primary consumer? (2021)
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A.
Grass
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B.
Rabbit
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C.
Fox
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D.
Mushroom
Solution
A rabbit is an example of a primary consumer as it feeds on plants (producers).
Correct Answer: B — Rabbit
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Q. Which of the following is an example of a substance in the plasma state? (2023)
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A.
Water
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B.
Oxygen gas
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C.
Lightning
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D.
Ice
Solution
Plasma is a state of matter where gases are energized until atomic electrons are no longer associated with the nucleus, as seen in lightning.
Correct Answer: C — Lightning
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Q. Which of the following is an example of a vestigial structure? (2021)
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A.
Human appendix
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B.
Whale flippers
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C.
Bird wings
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D.
Insect wings
Solution
The human appendix is considered a vestigial structure, as it has lost its original function over the course of evolution.
Correct Answer: A — Human appendix
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Q. Which of the following is an example of an alkane? (2023)
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A.
C2H4
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B.
C3H8
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C.
C4H6
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D.
C5H10
Solution
Alkanes are saturated hydrocarbons with the general formula CnH2n+2. C3H8 (propane) fits this formula.
Correct Answer: B — C3H8
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Q. Which of the following is an example of an alkene? (2023)
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A.
Ethane
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B.
Propene
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C.
Butane
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D.
Cyclohexane
Solution
Propene is an alkene, characterized by a carbon-carbon double bond.
Correct Answer: B — Propene
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Q. Which of the following is an example of an alkene? (2023) 2023
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A.
Ethane
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B.
Propene
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C.
Butane
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D.
Cyclohexane
Solution
Propene is an alkene, characterized by a carbon-carbon double bond.
Correct Answer: B — Propene
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Q. Which of the following is an example of an alkyne?
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A.
Ethane
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B.
Propene
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C.
Butyne
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D.
Benzene
Solution
Butyne is an alkyne, characterized by a triple bond between carbon atoms.
Correct Answer: C — Butyne
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Q. Which of the following is an example of an endothermic process? (2021)
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A.
Combustion of gasoline
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B.
Dissolving ammonium nitrate in water
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C.
Respiration
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D.
Condensation of steam
Solution
Dissolving ammonium nitrate in water absorbs heat, making it an endothermic process.
Correct Answer: B — Dissolving ammonium nitrate in water
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Q. Which of the following is an example of an oxidation reaction? (2020)
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A.
2H2 + O2 → 2H2O
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B.
C + O2 → CO2
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C.
Fe + CuSO4 → FeSO4 + Cu
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D.
Na + Cl2 → NaCl
Solution
In the reaction C + O2 → CO2, carbon is oxidized as it loses electrons to form CO2.
Correct Answer: B — C + O2 → CO2
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Q. Which of the following is an example of convergent evolution? (1980)
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A.
Darwin's finches
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B.
Whales and fish
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C.
Horses and zebras
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D.
Dogs and wolves
Solution
Convergent evolution occurs when unrelated species evolve similar traits, as seen in whales and fish, which both have streamlined bodies for swimming.
Correct Answer: B — Whales and fish
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Q. Which of the following is an example of divergent evolution?
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A.
Wings of bats and birds
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B.
Body shape of dolphins and sharks
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C.
Darwin's finches
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D.
Cacti and succulents
Solution
Darwin's finches are an example of divergent evolution, where different species evolved from a common ancestor and adapted to different environments.
Correct Answer: C — Darwin's finches
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Q. Which of the following is an example of ex-situ conservation? (2023)
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A.
National parks
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B.
Wildlife reserves
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C.
Aquariums
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D.
Biosphere reserves
Solution
Aquariums are an example of ex-situ conservation as they involve the conservation of species outside their natural habitats.
Correct Answer: C — Aquariums
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Q. Which of the following is an example of mutualism? (2021)
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A.
A lion hunting a zebra
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B.
Bees pollinating flowers
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C.
A tick feeding on a dog
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D.
A bird eating ticks off a cow
Solution
Mutualism is a symbiotic relationship where both species benefit, such as bees pollinating flowers.
Correct Answer: B — Bees pollinating flowers
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Q. Which of the following is an example of physisorption? (2021) 2021
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A.
Adsorption of hydrogen on palladium
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B.
Adsorption of water on silica gel
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C.
Adsorption of oxygen on activated charcoal
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D.
Adsorption of ammonia on copper
Solution
Physisorption involves weak Van der Waals forces, and the adsorption of water on silica gel is a classic example of this type of adsorption.
Correct Answer: B — Adsorption of water on silica gel
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Q. Which of the following is an example of sexual reproduction? (2023)
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A.
Budding in hydra
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B.
Fission in amoeba
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C.
Pollination in flowering plants
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D.
Regeneration in planaria
Solution
Pollination in flowering plants is a key process in sexual reproduction, involving the transfer of pollen to fertilize ovules.
Correct Answer: C — Pollination in flowering plants
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Q. Which of the following is an example of sublimation? (2022)
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A.
Ice melting
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B.
Dry ice turning into gas
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C.
Water boiling
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D.
Salt dissolving in water
Solution
Sublimation is the process where a solid turns directly into a gas, as seen with dry ice (solid CO2).
Correct Answer: B — Dry ice turning into gas
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Q. Which of the following is an example of thermal expansion? (2021)
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A.
A balloon inflating when heated
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B.
Ice melting in water
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C.
Water boiling
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D.
A metal rod contracting in cold
Solution
A balloon inflating when heated is an example of thermal expansion, as the gas inside expands with increased temperature.
Correct Answer: A — A balloon inflating when heated
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Q. Which of the following is asexual reproduction? (2019)
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A.
Budding in hydra
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B.
Fertilization in frogs
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C.
Pollination in flowering plants
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D.
Binary fission in amoeba
Solution
Binary fission in amoeba is a form of asexual reproduction where a single organism divides into two.
Correct Answer: D — Binary fission in amoeba
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