Biology (School & UG)
Q. What is the primary function of the epiglottis?
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A.
To filter air
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B.
To produce sound
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C.
To prevent food from entering the trachea
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D.
To facilitate gas exchange
Solution
The epiglottis is a flap that covers the trachea during swallowing, preventing food and liquids from entering the airway.
Correct Answer: C — To prevent food from entering the trachea
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Q. What is the primary function of the excretory system in animals?
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A.
To produce energy
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B.
To remove waste products
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C.
To facilitate movement
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D.
To regulate temperature
Solution
The primary function of the excretory system is to remove waste products from the body, maintaining homeostasis.
Correct Answer: B — To remove waste products
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Q. What is the primary function of the exoskeleton in arthropods?
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A.
Support and protection
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B.
Locomotion
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C.
Respiration
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D.
Reproduction
Solution
The exoskeleton in arthropods provides support and protection, allowing them to maintain their shape and protect against predators.
Correct Answer: A — Support and protection
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Q. What is the primary function of the Golgi apparatus in plant cells?
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A.
Energy production
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B.
Modification and packaging of proteins
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C.
Photosynthesis
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D.
Cell division
Solution
The Golgi apparatus modifies, sorts, and packages proteins and lipids 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 light reactions in photosynthesis?
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A.
To produce glucose
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B.
To convert solar energy into chemical energy
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C.
To fix carbon dioxide
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D.
To release oxygen
Solution
The light reactions convert solar energy into chemical energy in the form of ATP and NADPH.
Correct Answer: B — To convert solar energy into chemical energy
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Q. What is the primary function of the nasal cavity in the respiratory system?
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A.
Gas exchange
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B.
Air filtration and humidification
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C.
Sound production
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D.
Olfaction
Solution
The nasal cavity filters, warms, and humidifies the air before it enters the lungs.
Correct Answer: B — Air filtration and humidification
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Q. What is the primary function of the nephridia in annelids?
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A.
Reproduction
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B.
Excretion
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C.
Digestion
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D.
Circulation
Solution
Nephridia are excretory organs in annelids that help in the removal of waste products from the body.
Correct Answer: B — Excretion
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Q. What is the primary function of the ovaries in the female reproductive system?
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A.
To produce testosterone
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B.
To produce eggs and hormones
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C.
To facilitate childbirth
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D.
To transport sperm
Solution
The ovaries are responsible for producing eggs (ova) and hormones such as estrogen and progesterone.
Correct Answer: B — To produce eggs and hormones
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Q. What is the primary function of the ovule in seed plants?
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A.
To produce pollen
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B.
To develop into a seed after fertilization
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C.
To absorb water and nutrients
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D.
To support the plant structure
Solution
The ovule develops into a seed after fertilization, containing the embryo and stored nutrients.
Correct Answer: B — To develop into a seed after fertilization
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Q. What is the primary function of the placenta during human development?
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A.
To provide oxygen and nutrients to the fetus
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B.
To produce hormones
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C.
To protect the fetus from infections
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D.
To facilitate waste removal
Solution
The placenta serves as the interface between the mother and fetus, providing essential nutrients and oxygen while removing 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 plasma membrane in plant cells?
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A.
Energy production
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B.
Regulating transport
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C.
Photosynthesis
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D.
Cell division
Solution
The plasma membrane regulates the transport of substances in and out of the cell, maintaining homeostasis.
Correct Answer: B — Regulating transport
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Q. What is the primary function of the process of meiosis in plants?
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A.
To produce identical daughter cells
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B.
To generate genetic variation
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C.
To facilitate photosynthesis
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D.
To increase plant size
Solution
Meiosis is crucial for sexual reproduction as it reduces the chromosome number by half and introduces genetic variation through recombination.
Correct Answer: B — To generate genetic variation
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Q. What is the primary function of the respiratory system in animals?
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A.
Nutrient absorption
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B.
Gas exchange
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C.
Waste elimination
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D.
Hormone regulation
Solution
The primary function of the respiratory system is gas exchange, allowing oxygen to enter the body and carbon dioxide to be expelled.
Correct Answer: B — Gas exchange
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Q. What is the primary function of the respiratory system in humans?
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A.
To circulate blood
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B.
To exchange gases
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C.
To digest food
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D.
To regulate temperature
Solution
The primary function of the respiratory system is to exchange gases, specifically oxygen and carbon dioxide, between the body and the environment.
Correct Answer: B — To exchange gases
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Q. What is the primary function of the respiratory system in mammals?
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A.
Digestion of food
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B.
Transport of nutrients
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C.
Exchange of gases
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D.
Regulation of body temperature
Solution
The primary function of the respiratory system in mammals is the exchange of gases, specifically oxygen and carbon dioxide.
Correct Answer: C — Exchange of gases
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Q. What is the primary function of the respiratory system?
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A.
To circulate blood
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B.
To exchange gases
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C.
To digest food
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D.
To regulate temperature
Solution
The primary function of the respiratory system is to exchange gases, specifically oxygen and carbon dioxide, between the body and the environment.
Correct Answer: B — To exchange gases
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Q. What is the primary function of the ribosome in the cell?
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A.
DNA replication
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B.
RNA synthesis
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C.
Protein synthesis
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D.
Gene regulation
Solution
The primary function of the ribosome is to synthesize proteins by translating mRNA.
Correct Answer: C — Protein synthesis
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Q. What is the primary function of the root system in vascular plants?
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A.
Photosynthesis
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B.
Nutrient absorption
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C.
Reproduction
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D.
Gas exchange
Solution
The primary function of the root system in vascular plants is to absorb water and nutrients from the soil.
Correct Answer: B — Nutrient absorption
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Q. What is the primary function of the small intestine in the human digestive system?
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A.
Absorption of nutrients
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B.
Storage of waste
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C.
Production of bile
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D.
Mechanical digestion
Solution
The small intestine is primarily responsible for 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 small intestine?
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A.
Absorption of nutrients
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B.
Production of bile
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C.
Storage of waste
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D.
Mechanical digestion
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 stamen in flowering plants?
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A.
To produce seeds
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B.
To attract pollinators
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C.
To produce pollen
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D.
To support the flower
Solution
The stamen is the male reproductive part of a flower and is responsible for producing pollen.
Correct Answer: C — To produce pollen
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Q. What is the primary function of the stomach in digestion?
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A.
Absorption of nutrients
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B.
Mechanical and chemical digestion
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C.
Storage of bile
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D.
Production of insulin
Solution
The stomach's primary function is to perform mechanical and chemical digestion of food, aided by gastric juices.
Correct Answer: B — Mechanical and chemical digestion
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Q. What is the primary function of the stomach in the digestive process?
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A.
Absorption of nutrients
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B.
Chemical digestion of proteins
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C.
Storage of bile
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D.
Production of insulin
Solution
The stomach's primary function is the chemical digestion of proteins through gastric juices.
Correct Answer: B — Chemical digestion of proteins
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Q. What is the primary function of the swim bladder in fish?
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A.
Respiration
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B.
Buoyancy control
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C.
Reproduction
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D.
Digestion
Solution
The swim bladder allows fish to maintain buoyancy and control their depth in the water.
Correct Answer: B — Buoyancy control
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Q. What is the primary function of the xylem in vascular plants?
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A.
Transporting sugars
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B.
Transporting water and minerals
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C.
Storing nutrients
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D.
Photosynthesis
Solution
The xylem is responsible for transporting water and dissolved minerals from the roots to the rest of the plant.
Correct Answer: B — Transporting water and minerals
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Q. What is the primary function of xylem in plants?
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A.
Transport of nutrients
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B.
Transport of water
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C.
Photosynthesis
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D.
Storage of carbohydrates
Solution
Xylem is responsible for the transport of water and dissolved minerals from the roots to the rest of the plant.
Correct Answer: B — Transport of water
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Q. What is the primary function of xylem in vascular plants?
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A.
Transport of nutrients
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B.
Transport of water
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C.
Photosynthesis
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D.
Storage of carbohydrates
Solution
Xylem is responsible for the transport of water and dissolved minerals from the roots to the rest of the plant.
Correct Answer: B — Transport of water
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Q. What is the primary gas transported by hemoglobin in red blood cells?
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A.
Carbon dioxide
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B.
Oxygen
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C.
Nitrogen
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D.
Hydrogen
Solution
Hemoglobin primarily transports oxygen from the lungs to the tissues of the body.
Correct Answer: B — Oxygen
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Q. What is the primary goal of developing biofortified crops?
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A.
To improve taste
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B.
To enhance resistance to pests
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C.
To increase nutritional value
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D.
To reduce water requirements
Solution
The primary goal of developing biofortified crops is to enhance their nutritional value, addressing deficiencies in diets.
Correct Answer: C — To increase nutritional value
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Q. What is the primary goal of phytoremediation?
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A.
To enhance plant growth
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B.
To clean up contaminated environments
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C.
To increase crop yield
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D.
To improve soil fertility
Solution
Phytoremediation aims to clean up contaminated environments using plants that can absorb or degrade pollutants.
Correct Answer: B — To clean up contaminated environments
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