Q. Which of the following is an example of sexual reproduction? (2023)
A.
Budding in hydra
B.
Fission in amoeba
C.
Pollination in flowering plants
D.
Regeneration in planaria
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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)
A.
Ice melting
B.
Dry ice turning into gas
C.
Water boiling
D.
Salt dissolving in water
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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)
A.
A balloon inflating when heated
B.
Ice melting in water
C.
Water boiling
D.
A metal rod contracting in cold
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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)
A.
Budding in hydra
B.
Fertilization in frogs
C.
Pollination in flowering plants
D.
Binary fission in amoeba
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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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Q. Which of the following is known as the powerhouse of the cell? (2020)
A.
Nucleus
B.
Mitochondria
C.
Ribosome
D.
Endoplasmic Reticulum
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Solution
Mitochondria are known as the powerhouse of the cell because they produce ATP, the energy currency of the cell.
Correct Answer: B — Mitochondria
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Q. Which of the following is NOT a benefit of biodiversity? (2022)
A.
Increased ecosystem productivity
B.
Stability of ecosystems
C.
Reduction of disease
D.
Increased pollution
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Solution
Increased pollution is not a benefit of biodiversity; rather, biodiversity helps in reducing pollution.
Correct Answer: D — Increased pollution
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Q. Which of the following is NOT a benefit of biotechnology in agriculture? (2020)
A.
Increased crop yield
B.
Reduced pesticide use
C.
Enhanced food security
D.
Higher labor costs
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Solution
Higher labor costs are not a benefit of biotechnology; in fact, biotechnology often aims to reduce labor costs through increased efficiency.
Correct Answer: D — Higher labor costs
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Q. Which of the following is NOT a benefit of biotechnology in medicine? (2020)
A.
Production of monoclonal antibodies
B.
Development of vaccines
C.
Creation of synthetic fertilizers
D.
Gene therapy
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Solution
Creation of synthetic fertilizers is not a benefit of biotechnology in medicine; it is related to agricultural biotechnology.
Correct Answer: C — Creation of synthetic fertilizers
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Q. Which of the following is NOT a benefit of genetically modified crops? (2022)
A.
Increased yield
B.
Reduced pesticide use
C.
Enhanced nutritional content
D.
Higher cost of production
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Solution
Genetically modified crops are generally designed to reduce costs and increase yield, not to increase production costs.
Correct Answer: D — Higher cost of production
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Q. Which of the following is NOT a benefit of genetically modified organisms (GMOs)? (2022)
A.
Increased resistance to pests
B.
Higher nutritional value
C.
Reduced agricultural yield
D.
Drought resistance
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Solution
Reduced agricultural yield is not a benefit of GMOs; in fact, they are designed to increase yield and resilience.
Correct Answer: C — Reduced agricultural yield
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Q. Which of the following is NOT a benefit of using biotechnology in agriculture? (2022)
A.
Reduced pesticide use
B.
Increased resistance to diseases
C.
Higher production costs
D.
Enhanced nutritional content
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Solution
Higher production costs are not a benefit of biotechnology; in fact, biotechnology aims to reduce costs.
Correct Answer: C — Higher production costs
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Q. Which of the following is NOT a biotechnological application in medicine? (2022)
A.
Gene therapy
B.
Monoclonal antibodies
C.
Genetic engineering of crops
D.
Vaccines production
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Solution
Genetic engineering of crops is primarily an agricultural application, not a direct medical application.
Correct Answer: C — Genetic engineering of crops
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Q. Which of the following is NOT a characteristic of a population? (2023)
A.
Density
B.
Birth rate
C.
Age structure
D.
Species diversity
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Solution
Species diversity refers to the variety of species in an ecosystem, not a characteristic of a single population.
Correct Answer: D — Species diversity
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Q. Which of the following is NOT a characteristic of an ecosystem? (2021)
A.
Energy flow
B.
Nutrient cycling
C.
Static population
D.
Biotic and abiotic interactions
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Solution
Ecosystems are dynamic and characterized by changing populations, not static populations.
Correct Answer: C — Static population
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Q. Which of the following is not a characteristic of an endothermic reaction? (2023)
A.
Absorbs heat
B.
Feels cold to the touch
C.
Releases heat
D.
Positive ΔH
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Solution
Endothermic reactions absorb heat, feel cold, and have a positive ΔH; they do not release heat.
Correct Answer: C — Releases heat
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Q. Which of the following is NOT a characteristic of an exothermic reaction? (2019)
A.
Releases heat
B.
ΔH is negative
C.
Temperature of the surroundings increases
D.
Absorbs energy from the surroundings
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Solution
An exothermic reaction releases heat and has a negative ΔH. It causes the temperature of the surroundings to increase, not absorb energy.
Correct Answer: D — Absorbs energy from the surroundings
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Q. Which of the following is not a characteristic of an ideal solution? (2019)
A.
Constant boiling point
B.
Obeys Raoult's law
C.
No heat change on mixing
D.
Variable composition
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Solution
An ideal solution has a constant boiling point and obeys Raoult's law, while variable composition is not a characteristic.
Correct Answer: D — Variable composition
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Q. Which of the following is NOT a characteristic of crystalline solids? (2019)
A.
Anisotropy
B.
Definite melting point
C.
Isotropy
D.
Long-range order
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Solution
Crystalline solids exhibit anisotropy, meaning their properties vary with direction, while isotropy refers to uniform properties in all directions.
Correct Answer: C — Isotropy
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Q. Which of the following is not a characteristic of d-block elements? (2023)
A.
Formation of complex ions
B.
Variable oxidation states
C.
High ionization energies
D.
Good conductors of electricity
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Solution
D-block elements typically have variable oxidation states and lower ionization energies compared to p-block elements.
Correct Answer: C — High ionization energies
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Q. Which of the following is NOT a characteristic of essential oils? (2021)
A.
Volatile
B.
Non-polar
C.
Water-soluble
D.
Aromatic
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Solution
Essential oils are typically non-water-soluble and are known for their volatile and aromatic properties.
Correct Answer: C — Water-soluble
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Q. Which of the following is NOT a characteristic of ionic solids? (2021)
A.
High melting point
B.
Electrical conductivity in solid state
C.
Brittleness
D.
Solubility in water
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Solution
Ionic solids do not conduct electricity in the solid state; they conduct when melted or dissolved in water.
Correct Answer: B — Electrical conductivity in solid state
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Q. Which of the following is not a characteristic of life? (2023)
A.
Metabolism
B.
Homeostasis
C.
Adaptation
D.
Decay
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Solution
Decay is not a characteristic of life; it is a process that occurs after death.
Correct Answer: D — Decay
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Q. Which of the following is NOT a characteristic of living organisms? (2020)
A.
Growth
B.
Reproduction
C.
Movement
D.
Inertia
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Solution
Inertia is not a characteristic of living organisms; they exhibit growth, reproduction, and movement.
Correct Answer: D — Inertia
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Q. Which of the following is NOT a characteristic of polymers? (2023)
A.
High molecular weight
B.
Low melting point
C.
Viscoelasticity
D.
Solubility in water
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Solution
Polymers typically have low solubility in water, especially synthetic ones.
Correct Answer: D — Solubility in water
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Q. Which of the following is NOT a characteristic of r-selected species? (2019)
A.
High fecundity
B.
Short lifespan
C.
Low parental investment
D.
Long gestation period
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Solution
R-selected species are characterized by high fecundity and short lifespans, not long gestation periods.
Correct Answer: D — Long gestation period
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Q. Which of the following is NOT a characteristic of the phylum Echinodermata? (2022)
A.
Radial symmetry
B.
Water vascular system
C.
Presence of a notochord
D.
Tube feet
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Solution
Echinodermata do not possess a notochord; this feature is characteristic of Chordata.
Correct Answer: C — Presence of a notochord
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Q. Which of the following is NOT a characteristic of the phylum Mollusca? (2022)
A.
Soft-bodied
B.
Presence of a shell
C.
Jointed legs
D.
Mantle
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Solution
Phylum Mollusca is characterized by soft bodies, often with a shell, and a mantle, but they do not have jointed legs.
Correct Answer: C — Jointed legs
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Q. Which of the following is NOT a characteristic of the phylum Porifera? (2023)
A.
Multicellular
B.
Presence of true tissues
C.
Aquatic habitat
D.
Filter feeders
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Solution
Porifera, or sponges, lack true tissues, which distinguishes them from other multicellular organisms.
Correct Answer: B — Presence of true tissues
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Q. Which of the following is not a characteristic of the plant kingdom? (2020)
A.
Eukaryotic cells
B.
Autotrophic nutrition
C.
Presence of chlorophyll
D.
Heterotrophic nutrition
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Solution
The plant kingdom is characterized by eukaryotic cells, autotrophic nutrition, and the presence of chlorophyll. Heterotrophic nutrition is not a characteristic of plants.
Correct Answer: D — Heterotrophic nutrition
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Q. Which of the following is not a component of DNA? (2018)
A.
Deoxyribose
B.
Phosphate group
C.
Ribose
D.
Nitrogenous base
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Solution
Ribose is not a component of DNA; it is found in RNA. DNA contains deoxyribose.
Correct Answer: C — Ribose
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