Q. What is the primary factor that affects the rate of photosynthesis in relation to water transport?
A.
Light intensity
B.
Carbon dioxide concentration
C.
Water availability
D.
Temperature
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Solution
Water availability is crucial for photosynthesis, as it is a raw material needed for the process.
Correct Answer: C — Water availability
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Q. What is the primary factor that determines the distribution of organisms in an ecosystem? (2020)
A.
Soil type
B.
Climate
C.
Topography
D.
Human activity
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Solution
Climate is the primary factor influencing the distribution of organisms, as it affects temperature, precipitation, and seasonal changes.
Correct Answer: B — Climate
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Q. What is the primary factor that determines the inductance of a coil? (2020)
A.
Length of the wire
B.
Number of turns
C.
Material of the core
D.
All of the above
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Solution
The inductance of a coil is determined by the length of the wire, the number of turns, and the material of the core.
Correct Answer: D — All of the above
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Q. What is the primary factor that determines the type of ecosystem in a particular area? (2022)
A.
Soil type
B.
Climate
C.
Topography
D.
Human activity
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Solution
Climate is the primary factor that determines the type of ecosystem in a particular area, influencing temperature and precipitation.
Correct Answer: B — Climate
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Q. What is the primary focus of ex-situ conservation? (2022)
A.
Protecting species in their natural habitat
B.
Captive breeding of endangered species
C.
Restoring degraded ecosystems
D.
Creating wildlife corridors
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Solution
Ex-situ conservation focuses on the captive breeding of endangered species outside their natural habitats.
Correct Answer: B — Captive breeding of endangered species
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Q. What is the primary focus of the Convention on Biological Diversity (CBD)? (2019)
A.
Climate change
B.
Sustainable development
C.
Pollution control
D.
Economic growth
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Solution
The primary focus of the Convention on Biological Diversity (CBD) is sustainable development and the conservation of biological diversity.
Correct Answer: B — Sustainable development
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Q. What is the primary force holding the atoms together in covalent network solids? (2022)
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Van der Waals forces
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Solution
Covalent network solids are held together by covalent bonds, forming a continuous network throughout the solid.
Correct Answer: B — Covalent bonds
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Q. What is the primary force holding together the atoms in a metallic solid? (2020)
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Van der Waals forces
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Solution
Metallic solids are held together by metallic bonds, which involve a 'sea' of delocalized electrons around positively charged metal ions.
Correct Answer: C — Metallic bonds
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Q. What is the primary force holding together the atoms in metallic solids? (2020)
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Van der Waals forces
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Solution
Metallic solids are held together by metallic bonds, which involve a 'sea of electrons' that are free to move.
Correct Answer: C — Metallic bonds
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Q. What is the primary function of a diode? (2022)
A.
To amplify current
B.
To rectify current
C.
To store charge
D.
To generate voltage
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Solution
A diode primarily functions to rectify current, allowing it to flow in one direction only.
Correct Answer: B — To rectify current
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Q. What is the primary function of antibiotics? (2020)
A.
Pain relief
B.
Bacterial infection treatment
C.
Viral infection treatment
D.
Fungal infection treatment
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Solution
Antibiotics are primarily used to treat bacterial infections by inhibiting the growth of bacteria.
Correct Answer: B — Bacterial infection treatment
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Q. What is the primary function of antioxidants in food? (2022)
A.
Enhance flavor
B.
Preserve color
C.
Prevent oxidation
D.
Increase sweetness
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Solution
Antioxidants prevent oxidation, which can lead to spoilage and degradation of food quality.
Correct Answer: C — Prevent oxidation
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Q. What is the primary function of antioxidants in the body? (2020)
A.
Increase energy
B.
Prevent oxidation
C.
Enhance digestion
D.
Boost immunity
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Solution
Antioxidants prevent oxidation by neutralizing free radicals, thus protecting cells from damage.
Correct Answer: B — Prevent oxidation
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Q. What is the primary function of antioxidants in the human body? (2020)
A.
Increase energy
B.
Prevent oxidation
C.
Enhance digestion
D.
Boost immunity
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Solution
Antioxidants prevent oxidation, which can lead to cellular damage and contribute to various diseases.
Correct Answer: B — Prevent oxidation
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Q. What is the primary function of auxins in plant growth? (2020)
A.
Promote flowering
B.
Stimulate root growth
C.
Inhibit leaf abscission
D.
Promote cell division
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Solution
Auxins primarily stimulate root growth and are involved in various growth processes.
Correct Answer: B — Stimulate root growth
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Q. What is the primary function of blood as a connective tissue? (2023)
A.
Support
B.
Transport
C.
Protection
D.
Storage
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Solution
The primary function of blood as a connective tissue is transport.
Correct Answer: B — Transport
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Q. What is the primary function of cholesterol in the body? (2023)
A.
Energy storage
B.
Hormone production
C.
Protein synthesis
D.
Carbohydrate metabolism
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Solution
Cholesterol is essential for the production of hormones, including steroid hormones and vitamin D.
Correct Answer: B — Hormone production
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Q. What is the primary function of ciliated epithelial cells? (2023)
A.
Absorption
B.
Secretion
C.
Movement of substances
D.
Protection
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Solution
Ciliated epithelial cells are specialized for the movement of substances across their surface, such as mucus in the respiratory tract.
Correct Answer: C — Movement of substances
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Q. What is the primary function of cytokinins in plant growth? (2020)
A.
Promote root growth
B.
Stimulate cell division
C.
Inhibit aging
D.
Enhance fruit ripening
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Solution
Cytokinins primarily stimulate cell division and are involved in various growth processes.
Correct Answer: B — Stimulate cell division
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Q. What is the primary function of decomposers in an ecosystem? (2022)
A.
Produce energy
B.
Consume primary producers
C.
Break down dead organic matter
D.
Compete with herbivores
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Solution
Decomposers break down dead organic matter, recycling nutrients back into the ecosystem.
Correct Answer: C — Break down dead organic matter
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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 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 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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