Major Competitive Exams
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 soap in cleaning?
A.
Disinfecting
B.
Emulsifying
C.
Oxidizing
D.
Reducing
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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 the Achilles tendon? (2022)
A.
Flex the knee
B.
Extend the foot
C.
Stabilize the ankle
D.
Connect calf muscles to the heel
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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 cell membrane?
A.
To provide energy to the cell
B.
To control the movement of substances in and out of the cell
C.
To store genetic information
D.
To synthesize proteins
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Solution
The cell membrane regulates what enters and exits the cell, maintaining homeostasis.
Correct Answer: B — To control the movement of substances in and out of the cell
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Q. What is the primary function of the cell wall? (2019)
A.
Energy storage
B.
Protection and support
C.
Protein synthesis
D.
Cell division
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Solution
The cell wall provides protection and support to the cell, maintaining its shape and preventing excessive water uptake.
Correct Answer: B — Protection and support
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Q. What is the primary function of the circulatory system in the human body?
A.
To digest food
B.
To transport nutrients and oxygen
C.
To regulate body temperature
D.
To produce hormones
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Solution
The circulatory system is responsible for transporting nutrients, oxygen, and waste products throughout the body.
Correct Answer: B — To transport nutrients and oxygen
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Q. What is the primary function of the contraceptive pill? (2021)
A.
To prevent ovulation
B.
To increase libido
C.
To enhance fertility
D.
To cure STIs
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Solution
The primary function of the contraceptive pill is to prevent ovulation, thereby reducing the chances of pregnancy.
Correct Answer: A — To prevent ovulation
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Q. What is the primary function of the Election Commission of India?
A.
Conducting elections
B.
Amending the Constitution
C.
Legislating laws
D.
Appointing judges
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Solution
The primary function of the Election Commission of India is to conduct free and fair elections in the country.
Correct Answer: A — Conducting elections
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Q. What is the primary function of the flower's petals? (2022)
A.
Attract pollinators
B.
Protect the ovary
C.
Support the flower
D.
Store nutrients
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Solution
Petals are primarily designed to attract pollinators with their color and fragrance.
Correct Answer: A — Attract pollinators
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Q. What is the primary function of the Golgi apparatus? (2021)
A.
Protein synthesis
B.
Modification and packaging of proteins
C.
Lipid synthesis
D.
Cell division
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Solution
The Golgi apparatus modifies, sorts, and packages proteins for secretion or delivery to other organelles.
Correct Answer: B — Modification and packaging of proteins
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Q. What is the primary function of the hormone cortisol? (2023)
A.
Regulate metabolism
B.
Control stress response
C.
Stimulate growth
D.
Increase blood sugar
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Solution
Cortisol is a steroid hormone that helps control the body's stress response and regulates metabolism, immune response, and blood sugar levels.
Correct Answer: B — Control stress response
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Q. What is the primary function of the immune system? (2022)
A.
To regulate body temperature
B.
To protect against diseases
C.
To digest food
D.
To circulate blood
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Solution
The primary function of the immune system is to protect the body against diseases and infections.
Correct Answer: B — To protect against diseases
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Q. What is the primary function of the lymphatic system? (2022)
A.
Transporting oxygen
B.
Removing waste products
C.
Transporting lymph and aiding immune function
D.
Clotting blood
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Solution
The lymphatic system is responsible for transporting lymph, a fluid that contains infection-fighting white blood cells, and plays a crucial role in the immune system.
Correct Answer: C — Transporting lymph and aiding immune function
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Q. What is the primary function of the male reproductive system? (2020)
A.
Production of eggs
B.
Production of sperm
C.
Nourishment of the embryo
D.
Menstruation
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Solution
The primary function of the male reproductive system is the production of sperm, which is essential for fertilization.
Correct Answer: B — Production of sperm
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Q. What is the primary function of the mitochondria? (2020)
A.
Photosynthesis
B.
Cellular respiration
C.
Protein synthesis
D.
DNA replication
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Solution
Mitochondria are known as the powerhouse of the cell, where cellular respiration occurs to produce ATP.
Correct Answer: B — Cellular respiration
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Q. What is the primary function of the myelin sheath in neurons? (2021)
A.
To protect the neuron from damage
B.
To increase the speed of nerve impulse transmission
C.
To provide nutrients to the neuron
D.
To facilitate synaptic transmission
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Solution
The myelin sheath acts as an insulator and increases the speed of nerve impulse transmission through saltatory conduction.
Correct Answer: B — To increase the speed of nerve impulse transmission
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Q. What is the primary function of the phloem in flowering plants? (2023)
A.
Transport of water
B.
Transport of food
C.
Support
D.
Storage
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Solution
Phloem is responsible for the transport of food (sugars) produced during photosynthesis from leaves to other parts of the plant.
Correct Answer: B — Transport of food
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Q. What is the primary function of the placenta during pregnancy? (2023)
A.
To provide oxygen and nutrients to the fetus
B.
To produce hormones only
C.
To protect the fetus from all diseases
D.
To facilitate childbirth
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Solution
The placenta provides oxygen and nutrients to the developing fetus and removes waste products.
Correct Answer: A — To provide oxygen and nutrients to the fetus
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Q. What is the primary function of the renal pelvis? (2022)
A.
Filtration of blood
B.
Storage of urine
C.
Transport of urine to the bladder
D.
Production of urine
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Solution
The renal pelvis collects urine from the collecting ducts and transports it to the ureter.
Correct Answer: C — Transport of urine to the bladder
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Q. What is the primary function of the ribosomes in a cell? (2021)
A.
Energy production
B.
Protein synthesis
C.
DNA replication
D.
Cell division
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Solution
Ribosomes are the cellular structures responsible for synthesizing proteins by translating messenger RNA (mRNA).
Correct Answer: B — Protein synthesis
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Q. What is the primary function of the ribosomes? (2019)
A.
Energy production
B.
Protein synthesis
C.
Lipid synthesis
D.
DNA replication
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Solution
Ribosomes are responsible for protein synthesis by translating messenger RNA into polypeptide chains.
Correct Answer: B — Protein synthesis
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Q. What is the primary function of the root system in flowering plants? (2020)
A.
Photosynthesis
B.
Anchorage and absorption of water
C.
Reproduction
D.
Storage of food
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Solution
The primary function of the root system is to anchor the plant and absorb water and nutrients from the soil.
Correct Answer: B — Anchorage and absorption of water
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Q. What is the primary function of the rough endoplasmic reticulum? (2019)
A.
Lipid synthesis
B.
Protein synthesis
C.
Energy production
D.
Cell division
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Solution
The rough endoplasmic reticulum is studded with ribosomes and is primarily involved in the synthesis of proteins.
Correct Answer: B — Protein synthesis
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Q. What is the primary function of the skeletal system in locomotion? (2019)
A.
A. To produce blood cells
B.
B. To store minerals
C.
C. To provide a framework for muscle attachment
D.
D. To protect internal organs
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Solution
The primary function of the skeletal system in locomotion is to provide a framework for muscle attachment, enabling movement.
Correct Answer: C — C. To provide a framework for muscle attachment
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Q. What is the primary function of the skeletal system? (2021)
A.
Movement
B.
Protection of organs
C.
Mineral storage
D.
All of the above
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Solution
The skeletal system serves multiple functions including movement, protection of vital organs, and mineral storage.
Correct Answer: D — All of the above
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Q. What is the primary function of the small intestine in digestion? (2020)
A.
Absorption of nutrients
B.
Mechanical digestion
C.
Chemical digestion
D.
Storage of food
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Solution
The primary function of the small intestine is the absorption of nutrients from digested food.
Correct Answer: A — Absorption of nutrients
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Q. What is the primary function of the surfactant in the alveoli? (2019)
A.
Increase surface tension
B.
Decrease surface tension
C.
Facilitate gas exchange
D.
Prevent infection
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Solution
Surfactant reduces surface tension in the alveoli, preventing their collapse and aiding in gas exchange.
Correct Answer: B — Decrease surface tension
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Q. What is the primary function of thyroid hormones? (2022)
A.
Regulate metabolism
B.
Control blood pressure
C.
Stimulate growth
D.
Manage stress response
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Solution
Thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), are crucial for regulating metabolism in the body.
Correct Answer: A — Regulate metabolism
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Q. What is the primary function of white blood cells? (2022)
A.
Transporting oxygen
B.
Clotting blood
C.
Fighting infections
D.
Transporting nutrients
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Solution
White blood cells are part of the immune system and are primarily responsible for fighting infections and foreign invaders.
Correct Answer: C — Fighting infections
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Q. What is the primary gas found in the Earth's atmosphere? (2023)
A.
Oxygen
B.
Carbon Dioxide
C.
Nitrogen
D.
Hydrogen
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Solution
Nitrogen makes up about 78% of the Earth's atmosphere, making it the primary gas.
Correct Answer: C — Nitrogen
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