Biology (School & UG)
Q. What is the primary benefit of consuming antioxidants from plant sources?
A.
Increased energy
B.
Improved digestion
C.
Reduced oxidative stress
D.
Enhanced growth
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Solution
Antioxidants help reduce oxidative stress, which can lead to various diseases.
Correct Answer: C — Reduced oxidative stress
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Q. What is the primary benefit of consuming dietary fiber from plants?
A.
Increased protein intake
B.
Improved digestive health
C.
Enhanced taste
D.
Higher fat content
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Solution
Dietary fiber from plants is crucial for improving digestive health and preventing constipation.
Correct Answer: B — Improved digestive health
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Q. What is the primary benefit of consuming omega-3 fatty acids from plant sources?
A.
Improved digestion
B.
Heart health
C.
Bone strength
D.
Skin hydration
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Solution
Omega-3 fatty acids, found in flaxseeds and walnuts, are beneficial for heart health.
Correct Answer: B — Heart health
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Q. What is the primary benefit of using nitrogen-fixing bacteria in agriculture?
A.
They increase soil acidity
B.
They enhance soil structure
C.
They provide a natural source of nitrogen
D.
They promote plant disease resistance
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Solution
Nitrogen-fixing bacteria convert atmospheric nitrogen into a form that plants can use, reducing the need for chemical fertilizers.
Correct Answer: C — They provide a natural source of nitrogen
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Q. What is the primary characteristic that defines the Animal Kingdom?
A.
Photosynthesis
B.
Multicellularity
C.
Cell wall presence
D.
Autotrophic nutrition
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Solution
The Animal Kingdom is primarily defined by multicellularity, which distinguishes animals from unicellular organisms.
Correct Answer: B — Multicellularity
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Q. What is the primary characteristic that distinguishes angiosperms from gymnosperms?
A.
Presence of seeds
B.
Presence of flowers
C.
Presence of vascular tissue
D.
Presence of chlorophyll
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Solution
Angiosperms are characterized by the presence of flowers and fruit, which gymnosperms lack.
Correct Answer: B — Presence of flowers
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Q. What is the primary classification rank in the plant kingdom?
A.
Species
B.
Genus
C.
Family
D.
Kingdom
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Solution
The primary classification rank in the plant kingdom is 'Kingdom'.
Correct Answer: D — Kingdom
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Q. What is the primary component of the heart's conduction system that follows the SA node?
A.
Atrioventricular (AV) node
B.
Bundle of His
C.
Purkinje fibers
D.
Coronary arteries
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Solution
The atrioventricular (AV) node follows the SA node in the heart's conduction system, relaying impulses to the ventricles.
Correct Answer: A — Atrioventricular (AV) node
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Q. What is the primary component of the respiratory system that filters and humidifies the air?
A.
Lungs
B.
Nasal cavity
C.
Bronchi
D.
Alveoli
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Solution
The nasal cavity is responsible for filtering, warming, and humidifying the air before it enters the lungs.
Correct Answer: B — Nasal cavity
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Q. What is the primary criterion for classifying plants in the kingdom Plantae?
A.
Presence of chlorophyll
B.
Type of root system
C.
Height of the plant
D.
Color of the flowers
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Solution
Plants in the kingdom Plantae are primarily classified based on the presence of chlorophyll, which allows them to perform photosynthesis.
Correct Answer: A — Presence of chlorophyll
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Q. What is the primary difference between disinfection and sterilization?
A.
Disinfection kills all microorganisms, sterilization does not
B.
Sterilization kills all microorganisms, disinfection does not
C.
Disinfection is faster than sterilization
D.
Sterilization is only for surgical instruments
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Solution
The primary difference is that sterilization kills all microorganisms, while disinfection reduces the number of viable organisms but may not eliminate all.
Correct Answer: B — Sterilization kills all microorganisms, disinfection does not
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Q. What is the primary disadvantage of using glutaraldehyde as a disinfectant?
A.
It is ineffective against viruses
B.
It requires long exposure times
C.
It is corrosive to metals
D.
It has a strong odor
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Solution
The primary disadvantage of glutaraldehyde is its strong odor, which can be unpleasant and may pose health risks to users.
Correct Answer: D — It has a strong odor
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Q. What is the primary disadvantage of using glutaraldehyde for disinfection?
A.
It is ineffective against viruses
B.
It requires long exposure times
C.
It is corrosive to metals
D.
It is not environmentally friendly
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Solution
Glutaraldehyde is corrosive to metals, which limits its use in certain applications.
Correct Answer: C — It is corrosive to metals
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Q. What is the primary driver of adaptive evolution in plants?
A.
Genetic drift
B.
Natural selection
C.
Gene flow
D.
Mutation
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Solution
Natural selection is the primary driver of adaptive evolution, favoring traits that enhance survival and reproduction.
Correct Answer: B — Natural selection
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Q. What is the primary driving force for the movement of water in plants?
A.
Root pressure
B.
Capillary action
C.
Transpiration pull
D.
Soil moisture
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Solution
Transpiration pull is the primary driving force for water movement in plants, created by the evaporation of water from leaf surfaces.
Correct Answer: C — Transpiration pull
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Q. What is the primary evolutionary advantage of bilateral symmetry in animals?
A.
Increased mobility
B.
Better camouflage
C.
Enhanced sensory perception
D.
More efficient digestion
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Solution
Bilateral symmetry allows for increased mobility and streamlined movement, which is advantageous for predation and escape.
Correct Answer: A — Increased mobility
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Q. What is the primary factor driving the evolution of plant morphology?
A.
Climate change
B.
Soil composition
C.
Pollinator preferences
D.
Competition for light
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Solution
Competition for light is a primary factor driving the evolution of plant morphology, influencing growth forms and structures.
Correct Answer: D — Competition for light
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Q. What is the primary factor driving the evolution of plant traits?
A.
Climate change
B.
Human intervention
C.
Environmental pressures
D.
Soil composition
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Solution
Environmental pressures, such as competition and resource availability, primarily drive the evolution of plant traits.
Correct Answer: C — Environmental pressures
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Q. What is the primary function of actinomycetes in soil?
A.
Nitrogen fixation
B.
Decomposition of organic matter
C.
Photosynthesis
D.
Pathogen resistance
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Solution
Actinomycetes play a crucial role in the decomposition of organic matter, contributing to nutrient cycling in soil.
Correct Answer: B — Decomposition of organic matter
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Q. What is the primary function of antibodies in the immune response?
A.
To directly kill pathogens
B.
To neutralize toxins
C.
To enhance phagocytosis
D.
To activate complement system
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Solution
Antibodies enhance phagocytosis by opsonization, making it easier for phagocytes to engulf pathogens.
Correct Answer: C — To enhance phagocytosis
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Q. What is the primary function of antioxidants found in fruits and vegetables?
A.
Increase growth rate
B.
Protect against cellular damage
C.
Enhance color
D.
Aid in photosynthesis
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Solution
Antioxidants protect cells from damage caused by free radicals.
Correct Answer: B — Protect against cellular damage
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Q. What is the primary function of auxins in plant development?
A.
Promote flowering
B.
Stimulate root growth
C.
Regulate fruit ripening
D.
Inhibit leaf abscission
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Solution
Auxins primarily stimulate root growth and are involved in various developmental processes.
Correct Answer: B — Stimulate root growth
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Q. What is the primary function of B cells in the immune response?
A.
Phagocytosis of pathogens
B.
Production of antibodies
C.
Activation of T cells
D.
Release of cytokines
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Solution
B cells are primarily responsible for the production of antibodies, which are crucial for the humoral immune response.
Correct Answer: B — Production of antibodies
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Q. What is the primary function of bile in digestion?
A.
Break down proteins
B.
Emulsify fats
C.
Neutralize stomach acid
D.
Absorb vitamins
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Solution
Bile emulsifies fats, making them easier to digest and absorb in the small intestine.
Correct Answer: B — Emulsify fats
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Q. What is the primary function of chlorophyll in plants?
A.
Water absorption
B.
Nutrient transport
C.
Photosynthesis
D.
Respiration
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Solution
Chlorophyll is essential for photosynthesis as it captures light energy.
Correct Answer: C — Photosynthesis
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Q. What is the primary function of chloroplasts in plant cells?
A.
Energy production
B.
Photosynthesis
C.
Cell division
D.
Protein synthesis
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Solution
Chloroplasts are the organelles responsible for photosynthesis, converting light energy into chemical energy.
Correct Answer: B — Photosynthesis
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Q. What is the primary function of collenchyma cells?
A.
Transport nutrients
B.
Provide flexible support
C.
Store water
D.
Conduct photosynthesis
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Solution
Collenchyma cells provide flexible support to young stems and leaves, allowing for growth and movement.
Correct Answer: B — Provide flexible support
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Q. What is the primary function of cytokinins in plants?
A.
Promote cell division
B.
Inhibit aging
C.
Stimulate root growth
D.
Enhance photosynthesis
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Solution
Cytokinins primarily promote cell division and growth in plants.
Correct Answer: A — Promote cell division
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Q. What is the primary function of DNA in plant cells?
A.
Energy production
B.
Protein synthesis
C.
Genetic information storage
D.
Photosynthesis
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Solution
DNA stores genetic information that is essential for the growth, development, and reproduction of plants.
Correct Answer: C — Genetic information storage
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Q. What is the primary function of essential oils derived from plants in human health?
A.
Nutrient absorption
B.
Aromatherapy and relaxation
C.
Photosynthesis
D.
Water storage
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Solution
Essential oils are often used in aromatherapy for their calming and therapeutic effects.
Correct Answer: B — Aromatherapy and relaxation
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