Biology is the science of life — from the tiniest cell to the most complex human systems. This category is designed to support school students (Classes 6–12) as well as undergraduate (UG) learners with clear explanations, exam-focused content, and concept-building resources. You’ll find:
Concept-wise explanations aligned with NCERT and common UG syllabi
Important questions & answers for school exams, NEET foundation, and college tests
Human physiology, genetics, ecology, biotechnology, and cell biology explained simply
Practice questions, MCQs, and revision notes to strengthen understanding
Doubt-solving and conceptual clarity for competitive and academic success
Whether you’re preparing for school exams , building a strong base for NEET , or studying Biology at the undergraduate level , this section helps you learn smarter, revise faster, and understand Biology deeply — not just memorize it.
Learn life sciences the right way — clear concepts, exam relevance, and real understanding.
Q. What is the main function of stomata in plants?
A.
Nutrient absorption
B.
Gas exchange
C.
Water storage
D.
Support
Show solution
Solution
Stomata facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer:
B
— Gas exchange
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Q. What is the main function of the Calvin cycle?
A.
To produce ATP
B.
To fix carbon dioxide
C.
To absorb light
D.
To release oxygen
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Solution
The main function 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 function of the cambium in plants?
A.
Photosynthesis
B.
Water transport
C.
Growth in thickness
D.
Nutrient storage
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Solution
The cambium is responsible for secondary growth, allowing plants to increase in thickness.
Correct Answer:
C
— Growth in thickness
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Q. What is the main function of the enzyme RuBisCO in photosynthesis?
A.
Fixing carbon dioxide
B.
Producing ATP
C.
Splitting water
D.
Generating NADPH
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Solution
RuBisCO is responsible for fixing carbon dioxide in the Calvin cycle.
Correct Answer:
A
— Fixing carbon dioxide
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Q. What is the main function of the gallbladder?
A.
Stores bile
B.
Produces bile
C.
Absorbs nutrients
D.
Secretes digestive enzymes
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Solution
The gallbladder stores bile produced by the liver until it is needed for digestion.
Correct Answer:
A
— Stores bile
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Q. What is the main function of the light reactions in photosynthesis?
A.
To produce glucose
B.
To convert light energy into chemical energy
C.
To release carbon dioxide
D.
To absorb water
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Solution
The main function of the light reactions is to convert light energy into chemical energy in the form of ATP and NADPH.
Correct Answer:
B
— To convert light energy into chemical energy
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Q. What is the main function of the light reactions?
A.
To produce glucose
B.
To convert solar energy to chemical energy
C.
To release carbon dioxide
D.
To synthesize proteins
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Solution
The main function of the light reactions is to convert solar energy into chemical energy in the form of ATP and NADPH.
Correct Answer:
B
— To convert solar energy to chemical energy
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Q. What is the main function of the light-harvesting complexes?
A.
To transport electrons
B.
To absorb and transfer light energy
C.
To fix carbon
D.
To produce glucose
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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?
A.
Transport water
B.
Transport nutrients
C.
Transport sugars
D.
Support structure
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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?
A.
To produce ATP
B.
To fix carbon dioxide
C.
To split water
D.
To generate NADPH
Show solution
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?
A.
Production of hormones
B.
Support and protection
C.
Digestion of food
D.
Respiration
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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?
A.
Absorption of nutrients
B.
Mechanical and chemical digestion
C.
Storage of bile
D.
Production of insulin
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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?
A.
Storage of glucose
B.
Light absorption
C.
Carbon fixation
D.
Water splitting
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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?
A.
Transport of sugars
B.
Transport of water and minerals
C.
Photosynthesis
D.
Storage of nutrients
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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?
A.
Transport of nutrients
B.
Transport of water
C.
Photosynthesis
D.
Storage of food
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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?
A.
Carbon dioxide
B.
Oxygen
C.
Nitrogen
D.
Hydrogen
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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?
A.
To enhance plant growth
B.
To clean up contaminated environments
C.
To increase crop yield
D.
To improve soil fertility
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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 plant biotechnology in relation to climate change?
A.
To create more ornamental plants
B.
To develop crops that can withstand extreme conditions
C.
To increase the number of plant species
D.
To reduce plant growth rates
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Solution
The main goal is to develop crops that can withstand extreme conditions caused by climate change, such as drought or flooding.
Correct Answer:
B
— To develop crops that can withstand extreme conditions
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Q. What is the main goal of synthetic biology?
A.
To understand natural biological systems
B.
To create new biological parts and systems
C.
To clone animals
D.
To sequence genomes
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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?
A.
Improved digestion
B.
Heart health
C.
Bone strength
D.
Skin hydration
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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?
A.
Vector-borne
B.
Airborne
C.
Direct contact
D.
Fecal-oral
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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?
A.
DNA replication
B.
Protein synthesis
C.
RNA degradation
D.
Cell division
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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?
A.
Oxygen
B.
ATP
C.
Glucose
D.
NADPH
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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?
A.
Glucose
B.
Oxygen
C.
NADPH
D.
ATP
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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?
A.
To initiate the immune response
B.
To enhance the immune memory
C.
To provide immediate protection
D.
To replace the primary vaccine
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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?
A.
To create genetically identical copies of an organism
B.
To sequence the entire genome
C.
To mutate genes
D.
To analyze gene expression
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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?
A.
Storage of food
B.
Growth and development
C.
Transport of water
D.
Photosynthesis
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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?
A.
To produce oxygen
B.
To convert solar energy into chemical energy
C.
To absorb nutrients
D.
To release carbon dioxide
Show solution
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 classification in conservation efforts?
A.
To increase biodiversity
B.
To identify endangered species
C.
To enhance agricultural yield
D.
To promote ornamental gardening
Show solution
Solution
Plant classification is essential in conservation efforts as it helps identify endangered species and prioritize their protection.
Correct Answer:
B
— To identify endangered species
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Q. What is the main purpose of plant reproduction?
A.
Growth
B.
Survival
C.
Genetic diversity
D.
Photosynthesis
Show solution
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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