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 scientific name for the division that includes ferns?
A.
Bryophyta
B.
Pteridophyta
C.
Gymnospermae
D.
Angiospermae
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Solution
The scientific name for the division that includes ferns is Pteridophyta.
Correct Answer:
B
— Pteridophyta
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Q. What is the significance of actinobacteria in soil health?
A.
They are pathogens to plants
B.
They produce antibiotics
C.
They enhance photosynthesis
D.
They increase soil salinity
Show solution
Solution
Actinobacteria are important for soil health as they produce antibiotics and help decompose organic matter.
Correct Answer:
B
— They produce antibiotics
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Q. What is the significance of alkaloids in plants?
A.
Photosynthesis
B.
Medicinal properties
C.
Water storage
D.
Nutrient transport
Show solution
Solution
Alkaloids have significant medicinal properties and can affect human health.
Correct Answer:
B
— Medicinal properties
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Q. What is the significance of antioxidants found in fruits and vegetables for human health?
A.
They provide energy
B.
They prevent cell damage
C.
They enhance flavor
D.
They increase weight
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Solution
Antioxidants help prevent cell damage caused by free radicals, thus playing a crucial role in maintaining health.
Correct Answer:
B
— They prevent cell damage
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Q. What is the significance of apomixis in plant reproduction?
A.
It allows for sexual reproduction without fertilization
B.
It increases the need for pollinators
C.
It reduces seed viability
D.
It promotes genetic diversity
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Solution
Apomixis allows plants to produce seeds without fertilization, maintaining the parent plant's genetic makeup.
Correct Answer:
A
— It allows for sexual reproduction without fertilization
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Q. What is the significance of crossing over during meiosis in plants?
A.
It increases genetic diversity
B.
It ensures identical offspring
C.
It repairs DNA
D.
It produces energy
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Solution
Crossing over during meiosis increases genetic diversity by exchanging genetic material between homologous chromosomes.
Correct Answer:
A
— It increases genetic diversity
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Q. What is the significance of endophytes in plants?
A.
They cause diseases
B.
They enhance plant growth
C.
They compete with roots for nutrients
D.
They are harmful to humans
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Solution
Endophytes are beneficial microbes that live within plant tissues and can enhance growth and stress resistance.
Correct Answer:
B
— They enhance plant growth
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Q. What is the significance of gel electrophoresis in molecular biology?
A.
To separate DNA fragments based on size
B.
To amplify DNA
C.
To synthesize proteins
D.
To sequence RNA
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Solution
Gel electrophoresis is used to separate DNA fragments based on their size, allowing for analysis and comparison.
Correct Answer:
A
— To separate DNA fragments based on size
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Q. What is the significance of genetic recombination in plants?
A.
It increases genetic diversity
B.
It decreases mutation rates
C.
It stabilizes the genome
D.
It enhances photosynthesis
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Solution
Genetic recombination increases genetic diversity, which is important for adaptation and evolution in plants.
Correct Answer:
A
— It increases genetic diversity
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Q. What is the significance of genetic variation in plant evolution?
A.
It decreases adaptability
B.
It increases susceptibility to diseases
C.
It enhances survival and adaptability
D.
It has no impact on evolution
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Solution
Genetic variation is crucial for evolution as it enhances survival and adaptability to changing environments.
Correct Answer:
C
— It enhances survival and adaptability
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Q. What is the significance of genetic variation in plant populations?
A.
It decreases adaptability
B.
It enhances survival and adaptability
C.
It leads to uniformity in traits
D.
It has no impact on evolution
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Solution
Genetic variation is crucial for the adaptability and survival of plant populations, allowing them to respond to environmental changes.
Correct Answer:
B
— It enhances survival and adaptability
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Q. What is the significance of mycorrhizal associations in plant growth?
A.
Increase in photosynthesis
B.
Enhanced nutrient uptake
C.
Reduction of transpiration
D.
Promotion of flowering
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Solution
Mycorrhizal associations enhance nutrient uptake, particularly phosphorus, benefiting plant growth.
Correct Answer:
B
— Enhanced nutrient uptake
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Q. What is the significance of mycorrhizal associations in plant reproduction?
A.
They enhance seed germination
B.
They provide nutrients and water to the plant
C.
They increase flower production
D.
They prevent pollination
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Solution
Mycorrhizal associations improve nutrient and water uptake for plants, which can enhance overall health and reproductive success.
Correct Answer:
B
— They provide nutrients and water to the plant
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Q. What is the significance of mycorrhizal fungi in plant reproduction?
A.
They produce seeds
B.
They enhance nutrient uptake
C.
They facilitate pollination
D.
They increase leaf area
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Solution
Mycorrhizal fungi form symbiotic relationships with plant roots, improving nutrient and water uptake, which can enhance reproductive success.
Correct Answer:
B
— They enhance nutrient uptake
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Q. What is the significance of photoperiodism in plants?
A.
Regulating water loss
B.
Controlling flowering time
C.
Enhancing photosynthesis
D.
Increasing root growth
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Solution
Photoperiodism is the response of plants to the length of day and night, which controls flowering time.
Correct Answer:
B
— Controlling flowering time
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Q. What is the significance of photosynthesis in the global carbon cycle?
A.
It releases carbon dioxide
B.
It sequesters carbon dioxide
C.
It has no significance
D.
It produces methane
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Solution
Photosynthesis sequesters carbon dioxide from the atmosphere, playing a crucial role in the global carbon cycle.
Correct Answer:
B
— It sequesters carbon dioxide
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Q. What is the significance of phytochemicals in plants for human health?
A.
They are essential nutrients
B.
They provide color to flowers
C.
They have health-promoting properties
D.
They are used for photosynthesis
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Solution
Phytochemicals are bioactive compounds in plants that have health-promoting properties, contributing to disease prevention.
Correct Answer:
C
— They have health-promoting properties
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Q. What is the significance of plant taxonomy in agriculture?
A.
It helps in identifying pests
B.
It aids in crop rotation
C.
It allows for the classification of weeds
D.
It assists in breeding programs
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Solution
Plant taxonomy is crucial in agriculture as it assists in breeding programs by identifying and classifying different plant species for improved crop varieties.
Correct Answer:
D
— It assists in breeding programs
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Q. What is the significance of seed dispersal in plant reproduction?
A.
To increase competition among plants
B.
To ensure genetic uniformity
C.
To reduce the risk of predation
D.
To spread offspring to new locations
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Solution
Seed dispersal is significant as it helps spread offspring to new locations, reducing competition and increasing survival chances.
Correct Answer:
D
— To spread offspring to new locations
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Q. What is the significance of seed dormancy in plant reproduction?
A.
To ensure immediate germination
B.
To allow seeds to survive unfavorable conditions
C.
To promote cross-pollination
D.
To increase seed size
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Solution
Seed dormancy allows seeds to survive unfavorable conditions until the environment is suitable for germination.
Correct Answer:
B
— To allow seeds to survive unfavorable conditions
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Q. What is the significance of terpenes in plants?
A.
Photosynthesis
B.
Aromatic properties
C.
Nutrient storage
D.
Water retention
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Solution
Terpenes contribute to the aromatic properties of plants and have various health benefits.
Correct Answer:
B
— Aromatic properties
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Q. What is the significance of the 'denaturation' step in PCR?
A.
To cool the reaction mixture
B.
To separate the DNA strands
C.
To synthesize new DNA strands
D.
To add primers
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Solution
Denaturation involves heating the reaction mixture to separate the double-stranded DNA into single strands.
Correct Answer:
B
— To separate the DNA strands
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Q. What is the significance of the 'Golden Rice' project?
A.
It is a new variety of ornamental rice
B.
It aims to combat vitamin A deficiency
C.
It increases rice yield significantly
D.
It is resistant to all pests
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Solution
'Golden Rice' is genetically engineered to produce beta-carotene, addressing vitamin A deficiency in populations that rely on rice as a staple food.
Correct Answer:
B
— It aims to combat vitamin A deficiency
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Q. What is the significance of the 'sticky ends' created by restriction enzymes?
A.
They stabilize RNA
B.
They allow for the easy joining of DNA fragments
C.
They prevent mutations
D.
They enhance PCR efficiency
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Solution
'Sticky ends' are overhanging sequences that facilitate the ligation of DNA fragments during cloning.
Correct Answer:
B
— They allow for the easy joining of DNA fragments
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Q. What is the significance of the 'sticky ends' in DNA cloning?
A.
They prevent DNA degradation
B.
They facilitate the ligation of DNA fragments
C.
They enhance PCR efficiency
D.
They stabilize RNA structures
Show solution
Solution
'Sticky ends' are overhanging sequences that allow for the easy joining of DNA fragments during cloning.
Correct Answer:
B
— They facilitate the ligation of DNA fragments
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Q. What is the significance of the 'sticky ends' in recombinant DNA technology?
A.
They help in DNA replication
B.
They facilitate the ligation of DNA fragments
C.
They are used for PCR amplification
D.
They stabilize the DNA structure
Show solution
Solution
'Sticky ends' are overhanging sequences that allow for the easy ligation of DNA fragments during recombinant DNA technology.
Correct Answer:
B
— They facilitate the ligation of DNA fragments
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Q. What is the significance of the 'sticky ends' produced by some restriction enzymes?
A.
They allow for easier ligation of DNA fragments
B.
They prevent DNA degradation
C.
They enhance PCR efficiency
D.
They facilitate RNA transcription
Show solution
Solution
'Sticky ends' created by certain restriction enzymes allow for easier ligation of DNA fragments by providing complementary overhangs.
Correct Answer:
A
— They allow for easier ligation of DNA fragments
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Q. What is the significance of the 5' and 3' ends of a DNA strand?
A.
They indicate the direction of replication
B.
They determine the type of base pairs
C.
They are sites for protein binding
D.
They are involved in RNA splicing
Show solution
Solution
The 5' and 3' ends of a DNA strand indicate the direction of replication and transcription, as nucleic acids are synthesized in the 5' to 3' direction.
Correct Answer:
A
— They indicate the direction of replication
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Q. What is the significance of the 5' cap and poly-A tail in eukaryotic mRNA?
A.
They are involved in DNA replication
B.
They protect mRNA from degradation and assist in translation
C.
They are sites for transcription initiation
D.
They help in splicing introns
Show solution
Solution
The 5' cap and poly-A tail protect mRNA from degradation and facilitate its recognition and translation by ribosomes.
Correct Answer:
B
— They protect mRNA from degradation and assist in translation
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Q. What is the significance of the 5' cap and poly-A tail in mRNA?
A.
They are involved in DNA replication
B.
They protect mRNA from degradation and assist in translation
C.
They are required for transcription initiation
D.
They help in the splicing of introns
Show solution
Solution
The 5' cap and poly-A tail protect mRNA from degradation and facilitate its translation by ribosomes.
Correct Answer:
B
— They protect mRNA from degradation and assist in translation
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