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 role do mycorrhizal fungi play in plant ecology?
A.
They decompose organic matter
B.
They provide nutrients to plants
C.
They compete with plants for resources
D.
They inhibit plant growth
Show solution
Solution
Mycorrhizal fungi form symbiotic relationships with plant roots, providing essential nutrients like phosphorus in exchange for carbohydrates.
Correct Answer:
B
— They provide nutrients to plants
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Q. What role do mycorrhizal fungi play in plant health?
A.
They decompose organic matter
B.
They fix atmospheric nitrogen
C.
They enhance nutrient absorption
D.
They produce plant hormones
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Solution
Mycorrhizal fungi form symbiotic relationships with plant roots, enhancing nutrient absorption, particularly phosphorus.
Correct Answer:
C
— They enhance nutrient absorption
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Q. What role do plant classifications play in conservation efforts?
A.
They hinder conservation efforts
B.
They help identify endangered species
C.
They promote invasive species
D.
They are irrelevant to conservation
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Solution
Plant classifications help identify endangered species, which is crucial for conservation efforts.
Correct Answer:
B
— They help identify endangered species
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Q. What role do plants play in the carbon cycle?
A.
They release carbon dioxide during photosynthesis.
B.
They absorb carbon dioxide and release oxygen.
C.
They do not participate in the carbon cycle.
D.
They only store carbon in their roots.
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Solution
Plants absorb carbon dioxide during photosynthesis and release oxygen, playing a crucial role in the carbon cycle.
Correct Answer:
B
— They absorb carbon dioxide and release oxygen.
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Q. What role do pollinators play in the evolution of flowering plants?
A.
They increase genetic diversity
B.
They decrease competition
C.
They promote asexual reproduction
D.
They limit species distribution
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Solution
Pollinators play a crucial role in the evolution of flowering plants by increasing genetic diversity through cross-pollination.
Correct Answer:
A
— They increase genetic diversity
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Q. What role do seed banks play in plant conservation?
A.
They increase soil fertility
B.
They store genetic diversity
C.
They promote photosynthesis
D.
They enhance pollination
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Solution
Seed banks preserve seeds from various plant species, maintaining genetic diversity and providing resources for future restoration efforts.
Correct Answer:
B
— They store genetic diversity
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Q. What role do T helper cells play in the immune response?
A.
Directly kill infected cells
B.
Help activate B cells and cytotoxic T cells
C.
Produce antibodies
D.
Engulf and digest pathogens
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Solution
T helper cells assist in activating B cells and cytotoxic T cells, playing a central role in coordinating the immune response.
Correct Answer:
B
— Help activate B cells and cytotoxic T cells
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Q. What role do terpenes play in plant health and human medicine?
A.
Photosynthesis
B.
Aromatic properties
C.
Nutrient absorption
D.
Water retention
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Solution
Terpenes contribute to the aroma of plants and have various therapeutic effects.
Correct Answer:
B
— Aromatic properties
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Q. What role do terpenes play in plant health?
A.
Photosynthesis
B.
Attracting pollinators
C.
Water absorption
D.
Nutrient storage
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Solution
Terpenes attract pollinators and can deter herbivores, aiding in plant reproduction.
Correct Answer:
B
— Attracting pollinators
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Q. What role does NADPH play in photosynthesis?
A.
It stores energy
B.
It acts as an electron donor
C.
It is a byproduct
D.
It helps in water splitting
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Solution
NADPH acts as an electron donor in the Calvin cycle, providing the reducing power for carbon fixation.
Correct Answer:
B
— It acts as an electron donor
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Q. What role does RuBisCO play in photosynthesis?
A.
It absorbs light
B.
It fixes carbon dioxide
C.
It produces ATP
D.
It generates oxygen
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Solution
RuBisCO is the enzyme that catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer:
B
— It fixes carbon dioxide
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Q. What role does the liver play in digestion?
A.
Produces digestive enzymes
B.
Stores bile
C.
Absorbs nutrients
D.
Detoxifies harmful substances
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Solution
The liver detoxifies harmful substances and produces bile, which aids in fat digestion.
Correct Answer:
D
— Detoxifies harmful substances
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Q. What role does water play in the light reactions of photosynthesis?
A.
Source of carbon
B.
Source of electrons
C.
Source of ATP
D.
Source of glucose
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Solution
Water acts as a source of electrons in the light reactions, which are used to replace those lost by chlorophyll.
Correct Answer:
B
— Source of electrons
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Q. What role does water play in the light reactions?
A.
It absorbs light
B.
It provides electrons
C.
It fixes carbon
D.
It produces glucose
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Solution
Water provides electrons through the process of photolysis during the light reactions.
Correct Answer:
B
— It provides electrons
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Q. What structure forms from the inner cell mass of the blastocyst?
A.
Placenta
B.
Amniotic sac
C.
Embryo
D.
Chorion
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Solution
The inner cell mass of the blastocyst develops into the embryo, while the outer layer forms the placenta.
Correct Answer:
C
— Embryo
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Q. What term describes an organism's genetic makeup?
A.
Phenotype
B.
Genotype
C.
Allele
D.
Locus
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Solution
Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits.
Correct Answer:
B
— Genotype
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Q. What term describes the evolutionary process where two or more species influence each other's evolution?
A.
Co-evolution
B.
Convergent evolution
C.
Divergent evolution
D.
Adaptive radiation
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Solution
Co-evolution refers to the process where two or more species reciprocally affect each other's evolution.
Correct Answer:
A
— Co-evolution
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Q. What term describes the evolutionary process where unrelated species evolve similar traits due to similar environmental pressures?
A.
Convergent evolution
B.
Divergent evolution
C.
Adaptive radiation
D.
Co-evolution
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Solution
Convergent evolution occurs when unrelated species develop similar traits as a result of adapting to similar environments.
Correct Answer:
A
— Convergent evolution
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Q. What term describes the evolutionary process where unrelated species evolve similar traits?
A.
Convergent evolution
B.
Divergent evolution
C.
Adaptive radiation
D.
Co-evolution
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Solution
Convergent evolution occurs when unrelated species develop similar traits due to similar environmental pressures.
Correct Answer:
A
— Convergent evolution
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Q. What term describes the evolutionary relationship between different plant species?
A.
Phylogeny
B.
Morphology
C.
Taxonomy
D.
Ecology
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Solution
Phylogeny refers to the evolutionary history and relationships among species.
Correct Answer:
A
— Phylogeny
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Q. What term describes the genetic makeup of an organism?
A.
Phenotype
B.
Genotype
C.
Allele
D.
Chromosome
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Solution
The genotype refers to the specific genetic constitution of an organism, while the phenotype is the observable expression of that genotype.
Correct Answer:
B
— Genotype
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Q. What term describes the process by which two species evolve in response to each other?
A.
Convergent evolution
B.
Divergent evolution
C.
Co-evolution
D.
Adaptive radiation
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Solution
Co-evolution refers to the process where two or more species influence each other's evolutionary trajectory.
Correct Answer:
C
— Co-evolution
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Q. What type of blood vessel is primarily responsible for nutrient and gas exchange?
A.
Arteries
B.
Veins
C.
Capillaries
D.
Arterioles
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Solution
Capillaries are the smallest blood vessels and are primarily responsible for nutrient and gas exchange.
Correct Answer:
C
— Capillaries
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Q. What type of bond connects the sugar and phosphate groups in a DNA strand?
A.
Hydrogen bond
B.
Ionic bond
C.
Covalent bond
D.
Peptide bond
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Solution
Covalent bonds connect the sugar and phosphate groups, forming the backbone of the DNA strand.
Correct Answer:
C
— Covalent bond
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Q. What type of bond connects the sugar and phosphate groups in the DNA backbone?
A.
Hydrogen bond
B.
Ionic bond
C.
Covalent bond
D.
Peptide bond
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Solution
Covalent bonds connect the sugar and phosphate groups in the DNA backbone, providing structural stability.
Correct Answer:
C
— Covalent bond
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Q. What type of bond holds the two strands of DNA together?
A.
Ionic bonds
B.
Covalent bonds
C.
Hydrogen bonds
D.
Peptide bonds
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Solution
Hydrogen bonds between complementary nitrogenous bases hold the two strands of DNA together.
Correct Answer:
C
— Hydrogen bonds
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Q. What type of cell division is responsible for the growth of meristematic tissues?
A.
Mitosis
B.
Meiosis
C.
Binary fission
D.
Fragmentation
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Solution
Meristematic tissues grow through mitosis, allowing for the production of new cells for growth.
Correct Answer:
A
— Mitosis
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Q. What type of cell is responsible for photosynthesis in leaves?
A.
Sclerenchyma
B.
Collenchyma
C.
Chlorenchyma
D.
Meristematic
Show solution
Solution
Chlorenchyma cells, which contain chloroplasts, are specialized for photosynthesis.
Correct Answer:
C
— Chlorenchyma
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Q. What type of cells are primarily involved in the cell-mediated immune response?
A.
B cells
B.
Cytotoxic T cells
C.
Antigen-presenting cells
D.
Plasma cells
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Solution
Cytotoxic T cells are the main effector cells in the cell-mediated immune response, responsible for killing infected cells.
Correct Answer:
B
— Cytotoxic T cells
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Q. What type of cells are primarily involved in the storage of starch in plants?
A.
Sclerenchyma
B.
Parenchyma
C.
Collenchyma
D.
Epidermal cells
Show solution
Solution
Parenchyma cells are often involved in the storage of starch and other carbohydrates in plants.
Correct Answer:
B
— Parenchyma
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