Q. What is the main purpose of reproduction in organisms? (2020)
A.
To maintain homeostasis
B.
To produce energy
C.
To ensure species survival
D.
To grow and develop
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Solution
The main purpose of reproduction is to ensure the survival of a species by producing new individuals.
Correct Answer: C — To ensure species survival
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Q. What is the main purpose of respiration in plants? (2023)
A.
To produce glucose
B.
To release energy
C.
To absorb water
D.
To synthesize proteins
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Solution
The main purpose of respiration in plants is to release energy from glucose, which is essential for various cellular processes.
Correct Answer: B — To release energy
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Q. What is the main purpose of sexual reproduction? (2020)
A.
To produce more offspring
B.
To create genetic diversity
C.
To ensure survival of the species
D.
To reduce competition
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Solution
The main purpose of sexual reproduction is to create genetic diversity, which can improve adaptability.
Correct Answer: B — To create genetic diversity
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Q. What is the main purpose of taxation? (2020)
A.
To control inflation
B.
To fund government spending
C.
To reduce unemployment
D.
To promote exports
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Solution
The main purpose of taxation is to fund government spending on public services and infrastructure.
Correct Answer: B — To fund government spending
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Q. What is the main purpose of the acrosome in sperm? (2022)
A.
To provide energy
B.
To penetrate the egg
C.
To store genetic material
D.
To aid in motility
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Solution
The acrosome contains enzymes that help the sperm penetrate the outer layers of the egg during fertilization.
Correct Answer: B — To penetrate the egg
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Q. What is the main purpose of the amniotic fluid? (2023)
A.
Protection of the fetus
B.
Nourishment of the fetus
C.
Gas exchange
D.
Hormonal regulation
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Solution
The main purpose of the amniotic fluid is to protect the fetus by cushioning it from physical shocks.
Correct Answer: A — Protection of the fetus
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Q. What is the main purpose of the author's use of statistics in the passage? (2023)
A.
To confuse the reader
B.
To support an argument
C.
To entertain
D.
To provide background information
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Solution
The statistics are used to substantiate the author's argument about the urgency of addressing climate issues.
Correct Answer: B — To support an argument
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Q. What is the main purpose of the G1 phase in the cell cycle? (2022)
A.
DNA replication
B.
Cell growth and preparation for DNA synthesis
C.
Chromosome separation
D.
Cell division
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Solution
The G1 phase is primarily for cell growth and preparation for DNA synthesis.
Correct Answer: B — Cell growth and preparation for DNA synthesis
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Q. What is the main purpose of the menstrual cycle? (2023)
A.
To prepare the body for pregnancy
B.
To produce sperm
C.
To regulate hormone levels
D.
To eliminate waste
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Solution
The main purpose of the menstrual cycle is to prepare the female body for potential pregnancy each month.
Correct Answer: A — To prepare the body for pregnancy
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Q. What is the main purpose of the passage discussing the effects of urbanization?
A.
To highlight the benefits of urban living.
B.
To argue against urban development.
C.
To discuss the challenges posed by urbanization.
D.
To promote rural living as a better alternative.
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Solution
The passage primarily addresses the various challenges that urbanization brings, such as overcrowding and pollution.
Correct Answer: C — To discuss the challenges posed by urbanization.
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Q. What is the main purpose of the passage?
A.
To argue against climate change.
B.
To inform readers about the effects of climate change.
C.
To persuade readers to take action against climate change.
D.
To discuss the history of climate science.
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Solution
The primary purpose of the passage is to persuade readers to take action against climate change by highlighting its urgency and impact.
Correct Answer: C — To persuade readers to take action against climate change.
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Q. What is the main purpose of the S phase in the cell cycle? (2022)
A.
Cell growth
B.
DNA replication
C.
Cell division
D.
Protein synthesis
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Solution
The S phase is specifically for DNA replication, ensuring that each daughter cell receives a complete set of chromosomes.
Correct Answer: B — DNA replication
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Q. What is the main purpose of using antioxidants in food?
A.
Enhance color
B.
Prevent oxidation
C.
Improve taste
D.
Increase shelf life
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Solution
Antioxidants are used to prevent oxidation, which can lead to spoilage and loss of quality.
Correct Answer: B — Prevent oxidation
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Q. What is the main purpose of using baking soda in cooking?
A.
Flavoring
B.
Leavening
C.
Preserving
D.
Coloring
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Solution
Baking soda acts as a leavening agent, helping baked goods to rise.
Correct Answer: B — Leavening
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Q. What is the main purpose of using biopesticides in agriculture? (2023)
A.
Increase crop yield
B.
Reduce chemical pesticide use
C.
Enhance soil fertility
D.
Improve water retention
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Solution
Biopesticides are used to reduce the reliance on chemical pesticides, promoting a more sustainable approach to pest management.
Correct Answer: B — Reduce chemical pesticide use
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Q. What is the main purpose of using bioreactors in biotechnology? (2023)
A.
To produce energy
B.
To grow microorganisms or cells
C.
To purify proteins
D.
To store genetic material
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Solution
Bioreactors are designed to provide a controlled environment for the growth of microorganisms or cells for the production of bioproducts.
Correct Answer: B — To grow microorganisms or cells
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Q. What is the main purpose of using different base systems in mathematics and computing? (2023)
A.
To confuse users.
B.
To simplify calculations.
C.
To represent data in various formats.
D.
To limit the number of digits used.
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Solution
Different base systems are used to represent data in various formats, catering to different applications and requirements.
Correct Answer: C — To represent data in various formats.
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Q. What is the main purpose of using fluoride in dental care?
A.
Whiten teeth
B.
Prevent cavities
C.
Freshen breath
D.
Strengthen gums
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Solution
Fluoride is used in dental care to help prevent cavities and strengthen tooth enamel.
Correct Answer: B — Prevent cavities
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Q. What is the main purpose of using genetically modified crops? (2023)
A.
To produce more flowers
B.
To enhance flavor
C.
To improve resistance to diseases
D.
To reduce labor costs
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Solution
Genetically modified crops are primarily developed to improve resistance to diseases, pests, and environmental conditions.
Correct Answer: C — To improve resistance to diseases
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Q. What is the main purpose of using significant figures in measurements? (2019)
A.
To increase the number of digits
B.
To indicate precision
C.
To simplify calculations
D.
To convert units
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Solution
Significant figures indicate the precision of a measurement, reflecting the certainty of the digits.
Correct Answer: B — To indicate precision
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Q. What is the main reaction of phenols with bromine water? (2020)
A.
No reaction
B.
Formation of brominated phenol
C.
Formation of phenyl ether
D.
Formation of phenol red
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Solution
Phenols react with bromine water to form brominated phenols, which are usually colorless or pale yellow.
Correct Answer: B — Formation of brominated phenol
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Q. What is the main reaction of phenols with sodium hydroxide? (2020)
A.
Formation of sodium phenoxide
B.
Formation of ether
C.
Formation of alcohol
D.
Formation of ketone
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Solution
Phenols react with sodium hydroxide to form sodium phenoxide, which is a salt of phenol.
Correct Answer: A — Formation of sodium phenoxide
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Q. What is the main reaction type when alcohols are converted to alkyl halides?
A.
Substitution
B.
Elimination
C.
Addition
D.
Redox
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Solution
The conversion of alcohols to alkyl halides typically involves a nucleophilic substitution reaction.
Correct Answer: A — Substitution
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Q. What is the main reason for the appearance of a diffraction pattern when light passes through a narrow slit?
A.
Interference of light waves
B.
Refraction of light
C.
Absorption of light
D.
Reflection of light
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Solution
The diffraction pattern arises due to the interference of light waves that spread out after passing through the slit.
Correct Answer: A — Interference of light waves
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Q. What is the main reason for the existence of geometric isomers?
A.
Presence of double bonds
B.
Presence of single bonds
C.
Presence of chiral centers
D.
Presence of functional groups
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Solution
Geometric isomers arise due to restricted rotation around double bonds.
Correct Answer: A — Presence of double bonds
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Q. What is the main reason for the occurrence of seasons on Earth?
A.
Distance from the Sun
B.
Tilt of the Earth's axis
C.
Revolution around the Sun
D.
Rotation of the Earth
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Solution
The main reason for the occurrence of seasons on Earth is the tilt of the Earth's axis, which affects the angle of sunlight received.
Correct Answer: B — Tilt of the Earth's axis
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Q. What is the main reason for the stability of aromatic compounds?
A.
High molecular weight
B.
Presence of double bonds
C.
Resonance energy
D.
Hydrogen bonding
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Solution
The stability of aromatic compounds is primarily due to resonance energy, which arises from the delocalization of pi electrons across the ring.
Correct Answer: C — Resonance energy
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Q. What is the main reason for the stability of atomic nuclei?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The stability of atomic nuclei is primarily due to the strong nuclear force, which binds protons and neutrons together.
Correct Answer: C — Strong nuclear force
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Q. What is the main reason for the stability of benzene?
A.
Presence of double bonds
B.
Resonance
C.
Hydrogen bonding
D.
Ionic interactions
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Solution
The stability of benzene arises from resonance, where the electrons are delocalized over the ring structure, lowering the overall energy.
Correct Answer: B — Resonance
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Q. What is the main reason for the stability of the electron in an atom? (2019)
A.
Electrostatic attraction to the nucleus
B.
High energy levels
C.
Quantum tunneling
D.
Magnetic forces
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Solution
The stability of the electron in an atom is primarily due to the electrostatic attraction between the negatively charged electrons and the positively charged nucleus.
Correct Answer: A — Electrostatic attraction to the nucleus
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