Q. What is the primary function of fluoride in dental care?
A.
Whitening teeth
B.
Preventing cavities
C.
Strengthening enamel
D.
Reducing sensitivity
Show solution
Solution
Fluoride helps to strengthen tooth enamel and prevent cavities.
Correct Answer:
C
— Strengthening enamel
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Q. What is the primary function of glucagon? (2023)
A.
Increase blood glucose levels
B.
Decrease blood glucose levels
C.
Stimulate protein synthesis
D.
Inhibit fat breakdown
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Solution
Glucagon is a hormone that raises blood glucose levels by promoting the conversion of glycogen to glucose in the liver.
Correct Answer:
A
— Increase blood glucose levels
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Q. What is the primary function of hemoglobin in red blood cells? (2022)
A.
Transport nutrients
B.
Fight infections
C.
Carry oxygen
D.
Regulate pH
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Solution
Hemoglobin is a protein in red blood cells that binds to oxygen in the lungs and carries it to tissues throughout the body.
Correct Answer:
C
— Carry oxygen
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Q. What is the primary function of hemoglobin in the blood? (2019)
A.
Transport nutrients
B.
Regulate pH
C.
Carry oxygen
D.
Fight infections
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Solution
Hemoglobin's primary function is to carry oxygen from the lungs to the tissues and return carbon dioxide from the tissues to the lungs.
Correct Answer:
C
— Carry oxygen
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Q. What is the primary function of hemoglobin? (2022)
A.
Transport carbon dioxide
B.
Transport nutrients
C.
Transport oxygen
D.
Regulate blood pressure
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Solution
Hemoglobin's primary function is to transport oxygen from the lungs to the tissues.
Correct Answer:
C
— Transport oxygen
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Q. What is the primary function of leaves in flowering plants? (2023)
A.
Reproduction
B.
Photosynthesis
C.
Storage
D.
Support
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Solution
Leaves are primarily responsible for photosynthesis, converting sunlight into energy for the plant.
Correct Answer:
B
— Photosynthesis
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Q. What is the primary function of ligaments in the human body? (2019)
A.
Connect muscle to bone
B.
Connect bone to bone
C.
Support organs
D.
Facilitate movement
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Solution
Ligaments connect bone to bone, providing stability to joints.
Correct Answer:
B
— Connect bone to bone
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Q. What is the primary function of lipids in biological systems?
A.
Energy storage
B.
Catalysis
C.
Genetic information
D.
Structural support
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Solution
Lipids serve as a major form of energy storage in organisms.
Correct Answer:
A
— Energy storage
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Q. What is the primary function of lipids in the body? (2021)
A.
Energy storage
B.
Genetic information
C.
Structural support
D.
Transport
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Solution
Lipids primarily serve as energy storage molecules.
Correct Answer:
A
— Energy storage
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Q. What is the primary function of nervous tissue? (2022)
A.
Support and protection
B.
Movement
C.
Transmission of impulses
D.
Storage of energy
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Solution
Nervous tissue is responsible for the transmission of electrical impulses throughout the body, facilitating communication.
Correct Answer:
C
— Transmission of impulses
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Q. What is the primary function of nucleic acids? (2020)
A.
Energy storage
B.
Structural support
C.
Genetic information storage
D.
Catalysis
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Solution
Nucleic acids, such as DNA and RNA, are primarily responsible for storing and transmitting genetic information.
Correct Answer:
C
— Genetic information storage
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Q. What is the primary function of parathyroid hormone? (2023)
A.
Increase calcium levels in blood
B.
Decrease calcium levels in blood
C.
Regulate metabolism
D.
Stimulate growth
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Solution
Parathyroid hormone (PTH) increases calcium levels in the blood by stimulating the release of calcium from bones and increasing calcium absorption in the intestines.
Correct Answer:
A
— Increase calcium levels in blood
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Q. What is the primary function of petals in a flower? (2021)
A.
Support the flower
B.
Attract pollinators
C.
Protect the ovary
D.
Produce nectar
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Solution
Petals are often brightly colored to attract pollinators.
Correct Answer:
B
— Attract pollinators
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Q. What is the primary function of petals in flowering plants? (2020)
A.
Support the flower
B.
Protect the ovary
C.
Attract pollinators
D.
Produce seeds
Show solution
Solution
The primary function of petals is to attract pollinators with their color and fragrance.
Correct Answer:
C
— Attract pollinators
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Q. What is the primary function of plasma in the blood? (2020)
A.
Transporting oxygen
B.
Transporting nutrients and waste
C.
Fighting infections
D.
Clotting blood
Show solution
Solution
Plasma is the liquid component of blood that carries nutrients, hormones, and waste products throughout the body.
Correct Answer:
B
— Transporting nutrients and waste
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Q. What is the primary function of potassium in plants? (2020)
A.
Photosynthesis
B.
Water regulation
C.
Protein synthesis
D.
Cell division
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Solution
Potassium plays a crucial role in regulating water balance and osmotic pressure in plant cells.
Correct Answer:
B
— Water regulation
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Q. What is the primary function of preservatives in food?
A.
Enhance flavor
B.
Improve texture
C.
Prevent spoilage
D.
Increase nutritional value
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Solution
Preservatives are added to food to prevent spoilage caused by microorganisms.
Correct Answer:
C
— Prevent spoilage
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Q. What is the primary function of producers in an ecosystem? (2019)
A.
To consume other organisms
B.
To decompose organic matter
C.
To produce energy through photosynthesis
D.
To compete for resources
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Solution
Producers, such as plants, produce energy through photosynthesis, forming the base of the food chain.
Correct Answer:
C
— To produce energy through photosynthesis
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Q. What is the primary function of proteins in the body? (2023)
A.
Energy storage
B.
Catalyzing biochemical reactions
C.
Genetic information storage
D.
Cell membrane structure
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Solution
Proteins act as enzymes that catalyze biochemical reactions.
Correct Answer:
B
— Catalyzing biochemical reactions
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Q. What is the primary function of proteins in the body? (2023) 2023
A.
Energy storage
B.
Catalyzing biochemical reactions
C.
Genetic information storage
D.
Cell membrane structure
Show solution
Solution
Proteins primarily function as enzymes that catalyze biochemical reactions.
Correct Answer:
B
— Catalyzing biochemical reactions
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Q. What is the primary function of RAM in a computer?
A.
Store data permanently
B.
Execute programs
C.
Provide temporary storage
D.
Control peripherals
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Solution
RAM (Random Access Memory) provides temporary storage for data and programs that are currently in use.
Correct Answer:
C
— Provide temporary storage
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Q. What is the primary function of ribosomes? (2021)
A.
Energy production
B.
Protein synthesis
C.
Photosynthesis
D.
Cell division
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Solution
Ribosomes are responsible for protein synthesis in the cell.
Correct Answer:
B
— Protein synthesis
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Q. What is the primary function of root hairs in plants?
A.
Photosynthesis
B.
Water absorption
C.
Nutrient storage
D.
Gas exchange
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Solution
Root hairs increase the surface area of roots, enhancing the plant's ability to absorb water and nutrients from the soil.
Correct Answer:
B
— Water absorption
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Q. What is the primary function of sepals in a flower? (2021)
A.
Attract pollinators
B.
Protect the flower bud
C.
Produce nectar
D.
Support the petals
Show solution
Solution
Sepals protect the flower bud before it opens.
Correct Answer:
B
— Protect the flower bud
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Q. What is the primary function of sepals? (2019)
A.
Attract pollinators
B.
Protect the flower bud
C.
Support the petals
D.
Produce nectar
Show solution
Solution
Sepals protect the flower bud before it opens and can also support the petals.
Correct Answer:
B
— Protect the flower bud
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Q. What is the primary function of soap in cleaning?
A.
Disinfecting
B.
Emulsifying
C.
Oxidizing
D.
Reducing
Show solution
Solution
Soap acts as an emulsifier, allowing water to mix with oils and dirt for effective cleaning.
Correct Answer:
B
— Emulsifying
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Q. What is the primary function of surfactant in the lungs? (2020)
A.
Increase oxygen absorption
B.
Reduce surface tension
C.
Facilitate gas exchange
D.
Enhance lung elasticity
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Solution
Surfactant reduces surface tension in the alveoli, preventing their collapse and making it easier for the lungs to expand during inhalation.
Correct Answer:
B
— Reduce surface tension
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Q. What is the primary function of the Achilles tendon? (2022)
A.
Flex the knee
B.
Extend the foot
C.
Stabilize the ankle
D.
Connect calf muscles to the heel
Show solution
Solution
The Achilles tendon connects the calf muscles to the heel bone, allowing for foot movement.
Correct Answer:
D
— Connect calf muscles to the heel
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Q. What is the primary function of the alveoli? (2022)
A.
Transport oxygen
B.
Filter air
C.
Gas exchange
D.
Produce mucus
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Solution
The primary function of the alveoli is gas exchange, where oxygen is absorbed into the blood and carbon dioxide is released.
Correct Answer:
C
— Gas exchange
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Q. What is the primary function of the anther? (2021)
A.
To produce ovules
B.
To produce pollen
C.
To attract pollinators
D.
To support the flower
Show solution
Solution
The anther is the part of the stamen that produces and contains pollen grains.
Correct Answer:
B
— To produce pollen
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