Biology (School & UG)
Q. What is the main function of the light-harvesting complexes?
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A.
To transport electrons
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B.
To absorb and transfer light energy
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C.
To fix carbon
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D.
To produce glucose
Solution
Light-harvesting complexes absorb and transfer light energy to the reaction center.
Correct Answer: B — To absorb and transfer light energy
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Q. What is the main function of the phloem in vascular plants?
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A.
Transport water
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B.
Transport nutrients
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C.
Transport sugars
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D.
Support structure
Solution
Phloem is responsible for transporting sugars produced during photosynthesis throughout the plant.
Correct Answer: C — Transport sugars
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Q. What is the main function of the RuBisCO enzyme in photosynthesis?
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A.
To produce ATP
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B.
To fix carbon dioxide
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C.
To split water
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D.
To generate NADPH
Solution
RuBisCO catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer: B — To fix carbon dioxide
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Q. What is the main function of the skeletal system in vertebrates?
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A.
Production of hormones
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B.
Support and protection
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C.
Digestion of food
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D.
Respiration
Solution
The main function of the skeletal system is to provide support and protection for the body's organs and tissues.
Correct Answer: B — Support and protection
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Q. What is the main function of the stomach?
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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 main function of the stomach is to perform mechanical and chemical digestion of food.
Correct Answer: B — Mechanical and chemical digestion
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Q. What is the main function of the thylakoid membrane?
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A.
Storage of glucose
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B.
Light absorption
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C.
Carbon fixation
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D.
Water splitting
Solution
The thylakoid membrane's main function is to absorb light energy for photosynthesis.
Correct Answer: B — Light absorption
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Q. What is the main function of the xylem in vascular plants?
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A.
Transport of sugars
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B.
Transport of water and minerals
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C.
Photosynthesis
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D.
Storage of nutrients
Solution
Xylem is responsible for the transport of water and minerals from roots to other parts.
Correct Answer: B — Transport of water and minerals
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Q. What is the main 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 food
Solution
Xylem is responsible for the transport of water and minerals from the roots to the rest of the plant.
Correct Answer: B — Transport of water
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Q. What is the main 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 and helps carry carbon dioxide back to the lungs.
Correct Answer: B — Oxygen
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Q. What is the main 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 uses plants to clean up contaminated environments by absorbing or degrading pollutants.
Correct Answer: B — To clean up contaminated environments
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Q. What is the main goal of synthetic biology?
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A.
To understand natural biological systems
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B.
To create new biological parts and systems
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C.
To clone animals
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D.
To sequence genomes
Solution
Synthetic biology aims to design and construct new biological parts and systems for various applications.
Correct Answer: B — To create new biological parts and systems
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Q. What is the main health benefit of consuming omega-3 fatty acids found in certain plants?
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A.
Improved digestion
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B.
Heart health
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C.
Bone strength
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D.
Skin hydration
Solution
Omega-3 fatty acids are known to support heart health and reduce inflammation.
Correct Answer: B — Heart health
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Q. What is the main mode of transmission for the influenza virus?
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A.
Vector-borne
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B.
Airborne
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C.
Direct contact
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D.
Fecal-oral
Solution
The influenza virus is primarily transmitted through airborne droplets when an infected person coughs or sneezes.
Correct Answer: B — Airborne
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Q. What is the main outcome of gene expression?
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A.
DNA replication
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B.
Protein synthesis
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C.
RNA degradation
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D.
Cell division
Solution
Gene expression primarily results in the synthesis of proteins based on the information encoded in DNA.
Correct Answer: B — Protein synthesis
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Q. What is the main product of the Calvin cycle?
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A.
Oxygen
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B.
ATP
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C.
Glucose
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D.
NADPH
Solution
The main product of the Calvin cycle is glucose, which is synthesized from carbon dioxide.
Correct Answer: C — Glucose
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Q. What is the main product of the light-dependent reactions of photosynthesis?
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A.
Glucose
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B.
Oxygen
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C.
NADPH
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D.
ATP
Solution
Oxygen is released as a byproduct of the light-dependent reactions.
Correct Answer: B — Oxygen
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Q. What is the main purpose of a booster vaccine?
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A.
To initiate the immune response
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B.
To enhance the immune memory
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C.
To provide immediate protection
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D.
To replace the primary vaccine
Solution
Booster vaccines are given to enhance and prolong the immune memory established by the primary vaccination.
Correct Answer: B — To enhance the immune memory
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Q. What is the main purpose of cloning in biotechnology?
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A.
To create genetically identical copies of an organism
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B.
To sequence the entire genome
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C.
To mutate genes
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D.
To analyze gene expression
Solution
Cloning is used to create genetically identical copies of an organism or specific cells.
Correct Answer: A — To create genetically identical copies of an organism
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Q. What is the main purpose of meristematic tissue in plants?
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A.
Storage of food
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B.
Growth and development
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C.
Transport of water
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D.
Photosynthesis
Solution
Meristematic tissue is responsible for the growth and development of new cells in plants.
Correct Answer: B — Growth and development
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Q. What is the main purpose of photosynthesis?
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A.
To produce oxygen
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B.
To convert solar energy into chemical energy
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C.
To absorb nutrients
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D.
To release carbon dioxide
Solution
The main purpose of photosynthesis is to convert solar energy into chemical energy in the form of glucose.
Correct Answer: B — To convert solar energy into chemical energy
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Q. What is the main purpose of plant reproduction?
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A.
Growth
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B.
Survival
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C.
Genetic diversity
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D.
Photosynthesis
Solution
The main purpose of plant reproduction is to ensure genetic diversity and the continuation of the species.
Correct Answer: C — Genetic diversity
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Q. What is the main purpose of plant transpiration?
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A.
Nutrient storage
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B.
Water regulation
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C.
Photosynthesis
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D.
Seed dispersal
Solution
Transpiration helps regulate water loss and maintain nutrient flow in plants.
Correct Answer: B — Water regulation
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Q. What is the main purpose of plant tropisms?
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A.
Reproduction
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B.
Growth direction
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C.
Nutrient uptake
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D.
Water conservation
Solution
Tropisms are growth responses that direct plants towards or away from environmental stimuli.
Correct Answer: B — Growth direction
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Q. What is the main purpose of the Calvin cycle in photosynthesis?
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A.
To produce ATP
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B.
To fix carbon dioxide
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C.
To generate oxygen
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D.
To absorb light energy
Solution
The main purpose of the Calvin cycle is to fix carbon dioxide into organic molecules.
Correct Answer: B — To fix carbon dioxide
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Q. What is the main purpose of the Calvin cycle?
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A.
To absorb light
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B.
To produce ATP
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C.
To fix carbon dioxide
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D.
To release oxygen
Solution
The Calvin cycle's main purpose is to fix carbon dioxide into organic molecules.
Correct Answer: C — To fix carbon dioxide
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Q. What is the main purpose of the circulatory system in animals?
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A.
Transport nutrients and oxygen
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B.
Regulate body temperature
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C.
Facilitate movement
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D.
Produce hormones
Solution
The circulatory system's main purpose is to transport nutrients, oxygen, and waste products throughout the body.
Correct Answer: A — Transport nutrients and oxygen
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Q. What is the main purpose of the circulatory system?
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A.
To produce hormones
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B.
To transport blood and nutrients
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C.
To facilitate digestion
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D.
To provide structural support
Solution
The main purpose of the circulatory system is to transport blood, nutrients, gases, and waste products throughout the body.
Correct Answer: B — To transport blood and nutrients
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Q. What is the main purpose of the complement system in immunity?
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A.
To produce antibodies
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B.
To enhance inflammation and opsonization
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C.
To directly kill pathogens
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D.
To activate T cells
Solution
The complement system enhances inflammation and opsonization, aiding in the clearance of pathogens.
Correct Answer: B — To enhance inflammation and opsonization
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Q. What is the main purpose of the complement system?
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A.
To produce antibodies
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B.
To enhance phagocytosis and lyse pathogens
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C.
To activate T cells
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D.
To produce cytokines
Solution
The complement system enhances phagocytosis and can directly lyse pathogens, playing a vital role in the immune response.
Correct Answer: B — To enhance phagocytosis and lyse pathogens
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Q. What is the main purpose of the coronary arteries?
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A.
To supply blood to the lungs
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B.
To supply blood to the heart muscle
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C.
To drain blood from the heart
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D.
To regulate heart rhythm
Solution
The coronary arteries supply blood to the heart muscle itself, providing it with oxygen and nutrients.
Correct Answer: B — To supply blood to the heart muscle
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