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 role of the aorta in the circulatory system?
A.
To carry deoxygenated blood to the lungs
B.
To distribute oxygenated blood to the body
C.
To collect blood from the body
D.
To regulate blood pressure
Show solution
Solution
The aorta is the main artery that distributes oxygenated blood from the heart to the rest of the body.
Correct Answer:
B
— To distribute oxygenated blood to the body
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Q. What is the role of the apical meristem in plant growth?
A.
Photosynthesis
B.
Cell division
C.
Water absorption
D.
Nutrient storage
Show solution
Solution
The apical meristem is responsible for cell division, leading to primary growth in plants.
Correct Answer:
B
— Cell division
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Q. What is the role of the apical meristem in plants?
A.
Photosynthesis
B.
Cell division and growth
C.
Water absorption
D.
Nutrient storage
Show solution
Solution
The apical meristem is responsible for cell division and growth at the tips of roots and shoots.
Correct Answer:
B
— Cell division and growth
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Q. What is the role of the cambium in plant tissues?
A.
Photosynthesis
B.
Growth in thickness
C.
Water transport
D.
Nutrient storage
Show solution
Solution
Cambium is a type of meristematic tissue that contributes to secondary growth, increasing the thickness of stems and roots.
Correct Answer:
B
— Growth in thickness
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Q. What is the role of the coronary arteries?
A.
To supply blood to the lungs
B.
To supply blood to the heart muscle
C.
To drain blood from the heart
D.
To connect the heart to the brain
Show solution
Solution
Coronary arteries supply blood to the heart muscle itself, ensuring it receives the oxygen and nutrients needed to function.
Correct Answer:
B
— To supply blood to the heart muscle
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Q. What is the role of the endoplasmic reticulum in plant cells?
A.
Transport of materials
B.
Photosynthesis
C.
Cell division
D.
Storage of nutrients
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Solution
The endoplasmic reticulum is involved in the transport of materials within the cell and the synthesis of proteins and lipids.
Correct Answer:
A
— Transport of materials
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Q. What is the role of the liver in digestion?
A.
Secretes digestive enzymes
B.
Produces bile
C.
Absorbs nutrients
D.
Stores food
Show solution
Solution
The liver produces bile, which is essential for the emulsification and digestion of fats.
Correct Answer:
B
— Produces bile
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Q. What is the role of the microbiome in human health?
A.
It causes diseases.
B.
It has no significant role.
C.
It aids in digestion and immune function.
D.
It only affects skin health.
Show solution
Solution
The microbiome plays a crucial role in digestion, nutrient absorption, and modulating the immune system.
Correct Answer:
C
— It aids in digestion and immune function.
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Q. What is the role of the micropyle in seed development?
A.
To facilitate water absorption
B.
To allow pollen entry
C.
To provide a pathway for the sperm cell
D.
To protect the seed from pathogens
Show solution
Solution
The micropyle is a small opening in the ovule that allows water to enter during seed development.
Correct Answer:
A
— To facilitate water absorption
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Q. What is the role of the ovule in flowering plants?
A.
Photosynthesis
B.
Water storage
C.
Seed development
D.
Nutrient absorption
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Solution
The ovule is responsible for seed development after fertilization, as it contains the female gamete that, when fertilized, develops into a seed.
Correct Answer:
C
— Seed development
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Q. What is the role of the ovule in plant reproduction?
A.
To produce pollen
B.
To develop into a seed after fertilization
C.
To attract pollinators
D.
To support the flower structure
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Solution
The ovule develops into a seed after fertilization, containing the embryo and food supply.
Correct Answer:
B
— To develop into a seed after fertilization
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Q. What is the role of the pancreas in the digestive system?
A.
Secretes digestive enzymes
B.
Absorbs nutrients
C.
Stores bile
D.
Produces hydrochloric acid
Show solution
Solution
The pancreas secretes digestive enzymes that help break down carbohydrates, proteins, and fats in the small intestine.
Correct Answer:
A
— Secretes digestive enzymes
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Q. What is the role of the placenta during pregnancy?
A.
To provide oxygen and nutrients to the fetus
B.
To produce hormones only
C.
To protect the fetus from infections
D.
To store waste products
Show solution
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 role of the promoter in gene expression?
A.
To terminate transcription
B.
To enhance translation
C.
To initiate transcription
D.
To splice RNA
Show solution
Solution
The promoter is a DNA sequence that initiates transcription by providing a binding site for RNA polymerase.
Correct Answer:
C
— To initiate transcription
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Q. What is the role of the seed coat?
A.
Nourishment for the embryo
B.
Protection of the embryo
C.
Attraction of pollinators
D.
Photosynthesis
Show solution
Solution
The seed coat serves to protect the embryo from physical damage and desiccation during dormancy.
Correct Answer:
B
— Protection of the embryo
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Q. What is the role of the sinoatrial (SA) node in the heart?
A.
To pump blood to the lungs
B.
To initiate the heartbeat
C.
To regulate blood pressure
D.
To close the heart valves
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Solution
The sinoatrial (SA) node acts as the natural pacemaker of the heart, initiating electrical impulses that trigger heartbeats.
Correct Answer:
B
— To initiate the heartbeat
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Q. What is the role of the stigma in flowering plants?
A.
To produce ovules
B.
To receive pollen during fertilization
C.
To support the flower structure
D.
To attract pollinators
Show solution
Solution
The stigma is the part of the pistil that receives pollen during the process of fertilization.
Correct Answer:
B
— To receive pollen during fertilization
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Q. What is the role of the stomata in plant evolution?
A.
Gas exchange
B.
Water retention
C.
Nutrient absorption
D.
Photosynthesis
Show solution
Solution
Stomata play a crucial role in gas exchange, allowing plants to adapt to different environments throughout evolution.
Correct Answer:
A
— Gas exchange
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Q. What is the role of the style in a flower?
A.
To attract pollinators
B.
To support the anther
C.
To connect the stigma to the ovary
D.
To produce nectar
Show solution
Solution
The style connects the stigma, where pollen lands, to the ovary, where ovules are located.
Correct Answer:
C
— To connect the stigma to the ovary
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Q. What is the role of the valves in the heart?
A.
To increase blood pressure
B.
To prevent backflow of blood
C.
To oxygenate blood
D.
To regulate heart rate
Show solution
Solution
The valves in the heart prevent the backflow of blood, ensuring it flows in one direction.
Correct Answer:
B
— To prevent backflow of blood
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Q. What is the role of the villi in the small intestine?
A.
Increase surface area for absorption
B.
Secrete digestive enzymes
C.
Transport waste
D.
Produce bile
Show solution
Solution
Villi increase the surface area of the small intestine, enhancing nutrient absorption.
Correct Answer:
A
— Increase surface area for absorption
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Q. What is the role of tissue culture in plant biotechnology?
A.
To study plant genetics
B.
To propagate plants under sterile conditions
C.
To analyze soil health
D.
To enhance photosynthesis
Show solution
Solution
Tissue culture is used to propagate plants in a controlled, sterile environment, allowing for mass production.
Correct Answer:
B
— To propagate plants under sterile conditions
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Q. What is the role of tRNA during translation?
A.
To carry amino acids to the ribosome
B.
To synthesize mRNA
C.
To unwind DNA
D.
To form peptide bonds
Show solution
Solution
tRNA (transfer RNA) carries specific amino acids to the ribosome, where they are added to the growing polypeptide chain during translation.
Correct Answer:
A
— To carry amino acids to the ribosome
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Q. What is the role of tRNA in protein synthesis?
A.
To carry genetic information
B.
To form the ribosome
C.
To transport amino acids to the ribosome
D.
To splice RNA
Show solution
Solution
tRNA (transfer RNA) transports amino acids to the ribosome, where they are assembled into proteins according to the sequence of mRNA.
Correct Answer:
C
— To transport amino acids to the ribosome
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Q. What is the role of tRNA in translation?
A.
To carry amino acids to the ribosome
B.
To synthesize mRNA
C.
To replicate DNA
D.
To form ribosomal subunits
Show solution
Solution
tRNA (transfer RNA) carries specific amino acids to the ribosome during translation, matching them to the codons on the mRNA.
Correct Answer:
A
— To carry amino acids to the ribosome
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Q. What is the role of villi in the small intestine?
A.
Increase surface area for absorption
B.
Secrete digestive enzymes
C.
Transport waste
D.
Produce bile
Show solution
Solution
Villi increase the surface area of the small intestine, enhancing nutrient absorption.
Correct Answer:
A
— Increase surface area for absorption
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Q. What is the role of water in photosynthesis?
A.
Source of carbon
B.
Electron donor
C.
Energy source
D.
Nutrient supplier
Show solution
Solution
Water acts as an electron donor in the light reactions of photosynthesis.
Correct Answer:
B
— Electron donor
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Q. What is the role of water in the light reactions of photosynthesis?
A.
Source of electrons
B.
Source of carbon
C.
Source of glucose
D.
Source of oxygen
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Solution
Water serves as the source of electrons in the light reactions.
Correct Answer:
A
— Source of electrons
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Q. What is the role of water in the light reactions?
A.
To provide electrons
B.
To produce glucose
C.
To absorb light
D.
To fix carbon
Show solution
Solution
Water provides electrons through photolysis during the light reactions.
Correct Answer:
A
— To provide electrons
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Q. What is the role of water in the light-dependent reactions?
A.
Source of carbon
B.
Electron donor
C.
Energy storage
D.
Oxygen production
Show solution
Solution
Water acts as an electron donor in the light-dependent reactions, leading to the production of oxygen.
Correct Answer:
B
— Electron donor
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