Q. What is the main advantage of using biopesticides? (2022)
A.
They are more effective than chemical pesticides
B.
They are environmentally friendly
C.
They are cheaper to produce
D.
They have a longer shelf life
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Solution
Biopesticides are derived from natural materials and are considered environmentally friendly compared to chemical pesticides.
Correct Answer: B — They are environmentally friendly
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Q. What is the main advantage of using CRISPR technology in genetic engineering? (2021)
A.
High precision
B.
Low cost
C.
Speed of modification
D.
All of the above
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Solution
CRISPR technology offers high precision, low cost, and speed of modification, making it a powerful tool in genetic engineering.
Correct Answer: D — All of the above
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Q. What is the main advantage of using genetically modified organisms (GMOs) in agriculture? (2021)
A.
Higher nutritional value
B.
Increased resistance to diseases
C.
Lower production costs
D.
All of the above
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Solution
GMOs can provide higher nutritional value, increased resistance to diseases, and lower production costs.
Correct Answer: D — All of the above
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Q. What is the main advantage of using transgenic animals in research? (2021)
A.
Increased lifespan
B.
Disease modeling
C.
Higher reproduction rate
D.
Better growth rate
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Solution
Transgenic animals are primarily used in research for disease modeling, helping scientists understand human diseases.
Correct Answer: B — Disease modeling
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Q. What is the main advantage of using transgenic plants? (2022)
A.
Higher nutritional value
B.
Increased growth rate
C.
Resistance to herbicides
D.
Faster reproduction
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Solution
Transgenic plants are engineered to be resistant to herbicides, allowing for easier weed management.
Correct Answer: C — Resistance to herbicides
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Q. What is the main advantage of using yeast as a host for cloning? (2023)
A.
High growth rate
B.
Eukaryotic post-translational modifications
C.
Simple genome
D.
Low cost
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Solution
Yeast, being a eukaryote, can perform post-translational modifications similar to higher organisms, making it advantageous for expressing eukaryotic proteins.
Correct Answer: B — Eukaryotic post-translational modifications
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Q. What is the main application of CRISPR technology? (2023)
A.
Gene therapy
B.
Gene editing
C.
DNA sequencing
D.
Protein synthesis
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Solution
CRISPR technology is primarily used for gene editing, allowing precise modifications to DNA.
Correct Answer: B — Gene editing
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Q. What is the main assumption of the quantum mechanical model of the atom? (2023)
A.
Electrons are in fixed orbits
B.
Electrons have wave-like properties
C.
Electrons are stationary
D.
Electrons have no mass
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Solution
The quantum mechanical model assumes that electrons exhibit both particle and wave-like properties.
Correct Answer: B — Electrons have wave-like properties
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Q. What is the main cause of tuberculosis? (2019)
A.
Bacterial infection
B.
Viral infection
C.
Fungal infection
D.
Parasitic infection
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Solution
Tuberculosis is primarily caused by the bacterium Mycobacterium tuberculosis.
Correct Answer: A — Bacterial infection
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Q. What is the main characteristic of a molecular solid? (2021)
A.
High melting point
B.
Low melting point
C.
Good electrical conductivity
D.
High density
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Solution
Molecular solids generally have low melting points due to weak intermolecular forces.
Correct Answer: B — Low melting point
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Q. What is the main characteristic of amorphous solids? (2023)
A.
Long-range order
B.
Short-range order
C.
Definite melting point
D.
Anisotropic
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Solution
Amorphous solids lack long-range order, which distinguishes them from crystalline solids.
Correct Answer: B — Short-range order
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Q. What is the main characteristic of mammals? (2021)
A.
Cold-blooded
B.
Feathers
C.
Hair or fur
D.
Scales
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Solution
Mammals are characterized by the presence of hair or fur and mammary glands that produce milk.
Correct Answer: C — Hair or fur
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Q. What is the main characteristic of organisms in the phylum Porifera? (2022)
A.
Presence of a true coelom
B.
Body symmetry
C.
Presence of pores
D.
Presence of a notochord
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Solution
Organisms in the phylum Porifera, commonly known as sponges, are characterized by the presence of pores in their body.
Correct Answer: C — Presence of pores
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Q. What is the main characteristic of the phylum Mollusca? (2021)
A.
Jointed legs
B.
Soft-bodied with a hard shell
C.
Radial symmetry
D.
Exoskeleton made of chitin
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Solution
Mollusca are primarily soft-bodied animals, many of which have a hard shell for protection.
Correct Answer: B — Soft-bodied with a hard shell
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Q. What is the main characteristic of the phylum Porifera? (2021)
A.
Presence of a true coelom
B.
Body symmetry
C.
Presence of pores
D.
Presence of a notochord
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Solution
Porifera, or sponges, are characterized by the presence of numerous pores (ostia) in their body.
Correct Answer: C — Presence of pores
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Q. What is the main component of plasma in blood? (2023)
A.
Water
B.
Proteins
C.
Electrolytes
D.
Hormones
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Solution
Plasma is primarily composed of about 90% water, which serves as a solvent for various substances in the blood.
Correct Answer: A — Water
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Q. What is the main component of the cell wall in plant cells? (2023)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
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Solution
The cell wall of plant cells is primarily made of cellulose, which provides structural support.
Correct Answer: A — Cellulose
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Q. What is the main component of the cell wall in plants? (2022)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
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Solution
The main component of the plant cell wall is cellulose.
Correct Answer: A — Cellulose
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Q. What is the main component of urine? (2022)
A.
Water
B.
Urea
C.
Sodium chloride
D.
Creatinine
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Solution
The main component of urine is water, which makes up about 95% of its volume.
Correct Answer: A — Water
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Q. What is the main consequence of nuclear fusion? (2023)
A.
Release of energy
B.
Formation of heavier elements
C.
Emission of alpha particles
D.
All of the above
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Solution
The main consequence of nuclear fusion is the release of a significant amount of energy as lighter nuclei combine to form heavier nuclei.
Correct Answer: A — Release of energy
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Q. What is the main difference between isotopes of an element? (2022)
A.
Number of protons
B.
Number of neutrons
C.
Number of electrons
D.
Chemical properties
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Solution
Isotopes of an element differ in the number of neutrons while having the same number of protons.
Correct Answer: B — Number of neutrons
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Q. What is the main disadvantage of asexual reproduction? (2022)
A.
Slower reproduction rate
B.
Lack of genetic variation
C.
Requires more energy
D.
Involves two parents
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Solution
The main disadvantage of asexual reproduction is the lack of genetic variation, which can make populations vulnerable to diseases.
Correct Answer: B — Lack of genetic variation
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Q. What is the main driving force behind adaptive radiation? (1959)
A.
Environmental changes
B.
Genetic mutations
C.
Isolation
D.
All of the above
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Solution
Adaptive radiation occurs when a single ancestor species rapidly diversifies into a wide variety of forms to adapt to different environments, driven by environmental changes, genetic mutations, and isolation.
Correct Answer: D — All of the above
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Q. What is the main driving force for the movement of water in plants? (2023)
A.
Root pressure
B.
Capillary action
C.
Transpiration pull
D.
Gravity
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Solution
Transpiration pull, created by the evaporation of water from the leaves, is the main driving force for water movement in plants.
Correct Answer: C — Transpiration pull
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Q. What is the main driving force for the movement of water in the xylem?
A.
Root pressure
B.
Capillary action
C.
Transpiration pull
D.
Gravity
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Solution
Transpiration pull, created by the evaporation of water from the leaf surface, is the main driving force for water movement in the xylem.
Correct Answer: C — Transpiration pull
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Q. What is the main effect of deforestation on biodiversity? (2019)
A.
Increase in species diversity
B.
Habitat loss
C.
Improvement in ecosystem services
D.
Reduction in carbon footprint
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Solution
Deforestation leads to habitat loss, which is a major threat to biodiversity.
Correct Answer: B — Habitat loss
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Q. What is the main effect of deforestation on the environment? (2019)
A.
Increased biodiversity
B.
Soil conservation
C.
Loss of habitat
D.
Improved air quality
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Solution
Deforestation leads to the loss of habitat for many species, resulting in decreased biodiversity.
Correct Answer: C — Loss of habitat
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Q. What is the main energy source for muscle contraction? (2023)
A.
Glucose
B.
Fatty acids
C.
ATP
D.
Creatine phosphate
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Solution
Adenosine triphosphate (ATP) is the main energy source for muscle contraction.
Correct Answer: C — ATP
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Q. What is the main environmental concern associated with plastic waste? (2022)
A.
Air pollution
B.
Soil degradation
C.
Water contamination
D.
All of the above
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Solution
Plastic waste poses multiple environmental concerns, including air pollution from incineration, soil degradation, and water contamination.
Correct Answer: D — All of the above
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Q. What is the main enzyme involved in protein digestion in the stomach? (2021)
A.
Amylase
B.
Pepsin
C.
Trypsin
D.
Lipase
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Solution
Pepsin is the main enzyme that digests proteins in the acidic environment of the stomach.
Correct Answer: B — Pepsin
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