Q. What is the role of root hairs in plants?
A.
Photosynthesis
B.
Water absorption
C.
Gas exchange
D.
Nutrient storage
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Solution
Root hairs increase the surface area for water absorption from the soil, facilitating the uptake of water and nutrients.
Correct Answer: B — Water absorption
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Q. What is the role of sepals in a flower? (2022)
A.
Attract pollinators
B.
Protect the flower bud
C.
Produce pollen
D.
Support the ovary
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Solution
Sepals protect the flower bud before it opens and can also support the flower.
Correct Answer: B — Protect the flower bud
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Q. What is the role of sulfur in plants? (2023)
A.
Protein synthesis
B.
Photosynthesis
C.
Water uptake
D.
Cell division
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Solution
Sulfur is essential for the synthesis of amino acids and proteins, playing a critical role in plant metabolism.
Correct Answer: A — Protein synthesis
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Q. What is the role of synovial fluid in joints? (2022)
A.
Provides nutrients to cartilage
B.
Acts as a lubricant
C.
Absorbs shock
D.
All of the above
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Solution
Synovial fluid provides lubrication, nutrients, and shock absorption in synovial joints.
Correct Answer: D — All of the above
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Q. What is the role of tendons in the muscular system? (2023)
A.
Connect muscles to bones
B.
Connect bones to bones
C.
Store energy
D.
Facilitate blood flow
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Solution
Tendons connect muscles to bones, allowing for the transfer of force and movement.
Correct Answer: A — Connect muscles to bones
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Q. What is the role of the cambium in plants? (2021)
A.
Photosynthesis
B.
Growth in thickness
C.
Water transport
D.
Food storage
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Solution
The cambium is a layer of meristematic tissue that contributes to the growth in thickness (secondary growth) of stems and roots.
Correct Answer: B — Growth in thickness
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Q. What is the role of the cell membrane? (2021)
A.
Energy production
B.
Transport of substances
C.
Protein synthesis
D.
Photosynthesis
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Solution
The cell membrane regulates the transport of substances in and out of the cell.
Correct Answer: B — Transport of substances
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Q. What is the role of the filament in a flower? (2022)
A.
To support the anther
B.
To attract pollinators
C.
To produce ovules
D.
To receive pollen
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Solution
The filament is the stalk that supports the anther, which produces pollen.
Correct Answer: A — To support the anther
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Q. What is the role of the loop of Henle in the nephron? (2023)
A.
Reabsorption of water
B.
Secretion of urea
C.
Filtration of blood
D.
Regulation of pH
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Solution
The loop of Henle plays a crucial role in the reabsorption of water and salts, helping to concentrate urine.
Correct Answer: A — Reabsorption of water
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Q. What is the role of the lymphatic system in the human body? (2023)
A.
Transporting oxygen
B.
Removing waste products
C.
Regulating blood pressure
D.
Transporting lymph and immune cells
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Solution
The lymphatic system is responsible for transporting lymph, which contains immune cells, and helps in the removal of waste products from tissues.
Correct Answer: D — Transporting lymph and immune cells
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Q. What is the role of the M checkpoint in the cell cycle? (2023)
A.
To check for DNA damage
B.
To ensure chromosomes are properly aligned
C.
To initiate DNA replication
D.
To signal the end of cytokinesis
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Solution
The M checkpoint ensures that all chromosomes are properly aligned at the metaphase plate before the cell proceeds to anaphase.
Correct Answer: B — To ensure chromosomes are properly aligned
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Q. What is the role of the ovary in a flower? (2022)
A.
Produces nectar
B.
Contains ovules
C.
Supports the anther
D.
Attracts insects
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Solution
The ovary is the part of the flower that contains ovules, which develop into seeds after fertilization.
Correct Answer: B — Contains ovules
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Q. What is the role of the ovary in the female reproductive system? (2021)
A.
Production of sperm
B.
Production of eggs
C.
Fertilization of eggs
D.
Nourishment of the fetus
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Solution
The ovary's primary role in the female reproductive system is the production of eggs (ova) which are necessary for reproduction.
Correct Answer: B — Production of eggs
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Q. What is the role of the pancreas in digestion? (2023)
A.
Secretes bile
B.
Produces digestive enzymes
C.
Absorbs nutrients
D.
Stores food
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Solution
The pancreas produces digestive enzymes that help in the digestion of carbohydrates, proteins, and fats.
Correct Answer: B — Produces digestive enzymes
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Q. What is the role of the plasma membrane? (2021)
A.
Energy production
B.
Transport of substances
C.
Protein synthesis
D.
Genetic information storage
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Solution
The plasma membrane regulates the transport of substances in and out of the cell.
Correct Answer: B — Transport of substances
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Q. What is the role of the spleen in the human body? (2021)
A.
Production of insulin
B.
Filtration of blood
C.
Digestion of food
D.
Respiration
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Solution
The spleen plays a crucial role in filtering blood and removing old or damaged red blood cells.
Correct Answer: B — Filtration of blood
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Q. What is the role of the stigma in a flower? (2019)
A.
To produce ovules
B.
To receive pollen
C.
To support the flower
D.
To attract insects
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Solution
The stigma is the part of the pistil that receives pollen during fertilization.
Correct Answer: B — To receive pollen
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Q. What is the role of the synapse in neural communication? (2022)
A.
To generate action potentials
B.
To connect two neurons
C.
To insulate the axon
D.
To store neurotransmitters
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Solution
The synapse is the junction between two neurons where neurotransmitters are released to facilitate communication.
Correct Answer: B — To connect two neurons
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Q. What is the role of the synaptic cleft? (2022)
A.
To connect two neurons
B.
To store neurotransmitters
C.
To facilitate the transmission of signals between neurons
D.
To protect the neuron from damage
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Solution
The synaptic cleft is the gap between two neurons that allows neurotransmitters to transmit signals.
Correct Answer: C — To facilitate the transmission of signals between neurons
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Q. What is the role of the synovial fluid in joints? (2022)
A.
Provides nutrients to cartilage
B.
Acts as a lubricant
C.
Absorbs shock
D.
All of the above
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Solution
Synovial fluid serves multiple functions including lubrication, nutrient supply, and shock absorption in joints.
Correct Answer: D — All of the above
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Q. What is the role of vaccines in health? (2023)
A.
Cure diseases
B.
Prevent diseases
C.
Diagnose diseases
D.
None of the above
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Solution
Vaccines are used to prevent diseases by stimulating the immune system.
Correct Answer: B — Prevent diseases
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Q. What is the role of yeast in baking? (2022)
A.
Fermentation
B.
Decomposition
C.
Photosynthesis
D.
Respiration
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Solution
Yeast ferments sugars to produce carbon dioxide, which helps the dough rise in baking.
Correct Answer: A — Fermentation
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Q. What is the root mean square speed of gas molecules at a temperature T? (2021)
A.
√(3RT/M)
B.
√(RT/M)
C.
√(2RT/M)
D.
√(3kT/m)
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Solution
The root mean square speed (v_rms) of gas molecules is given by the formula v_rms = √(3RT/M), where R is the universal gas constant, T is the temperature, and M is the molar mass.
Correct Answer: A — √(3RT/M)
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Q. What is the scientific name of the domestic cat? (2023)
A.
Canis lupus
B.
Felis catus
C.
Equus caballus
D.
Bos taurus
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Solution
The scientific name of the domestic cat is Felis catus, following the binomial nomenclature system.
Correct Answer: B — Felis catus
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Q. What is the scientific study of living organisms called? (2021)
A.
Botany
B.
Zoology
C.
Biology
D.
Ecology
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Solution
Biology is the scientific study of living organisms.
Correct Answer: C — Biology
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Q. What is the shape of the magnetic field lines around a circular loop of wire carrying current? (2021)
A.
Straight lines
B.
Concentric circles
C.
Ellipses
D.
Spirals
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Solution
The magnetic field lines around a circular loop of wire carrying current are in the shape of concentric circles, with the center of the loop being the point of maximum field strength.
Correct Answer: B — Concentric circles
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Q. What is the shear modulus of a material if a shear stress of 100 MPa produces a shear strain of 0.05? (2021)
A.
2000 MPa
B.
500 MPa
C.
1000 MPa
D.
1500 MPa
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Solution
Shear modulus (G) = Shear stress / Shear strain = 100 MPa / 0.05 = 2000 MPa.
Correct Answer: A — 2000 MPa
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Q. What is the shear modulus of a material if a shear stress of 100 MPa produces a shear strain of 0.02? (2022)
A.
5000 MPa
B.
2000 MPa
C.
1000 MPa
D.
2500 MPa
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Solution
Shear modulus (G) = Shear stress / Shear strain = 100 MPa / 0.02 = 5000 MPa.
Correct Answer: A — 5000 MPa
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Q. What is the SI unit of electric current? (2021)
A.
Volt
B.
Ohm
C.
Ampere
D.
Coulomb
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Solution
The SI unit of electric current is the Ampere (A).
Correct Answer: C — Ampere
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Q. What is the SI unit of magnetic field strength? (2023)
A.
Tesla
B.
Weber
C.
Henry
D.
Ampere
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Solution
The SI unit of magnetic field strength is the Tesla (T).
Correct Answer: A — Tesla
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