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 advantage of using marker-assisted selection in plant breeding?
A.
It reduces the need for fertilizers
B.
It speeds up the breeding process
C.
It eliminates the need for irrigation
D.
It increases the size of fruits
Show solution
Solution
Marker-assisted selection speeds up the breeding process by allowing breeders to select plants with desirable traits more efficiently.
Correct Answer:
B
— It speeds up the breeding process
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Q. What is the main advantage of using plasmids as vectors in cloning?
A.
They are large and complex
B.
They replicate independently of chromosomal DNA
C.
They are difficult to manipulate
D.
They do not carry antibiotic resistance genes
Show solution
Solution
Plasmids can replicate independently of chromosomal DNA, making them ideal vectors for cloning.
Correct Answer:
B
— They replicate independently of chromosomal DNA
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Q. What is the main advantage of using steam sterilization over dry heat sterilization?
A.
Faster sterilization time
B.
Lower temperatures required
C.
More effective against spores
D.
All of the above
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Solution
Steam sterilization has the advantages of faster sterilization time, lower temperatures required, and greater effectiveness against spores compared to dry heat sterilization.
Correct Answer:
D
— All of the above
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Q. What is the main advantage of using transgenic plants in agriculture?
A.
Higher market prices
B.
Increased crop yield
C.
More labor-intensive farming
D.
Reduced biodiversity
Show solution
Solution
Transgenic plants are engineered to have traits that can lead to increased crop yield, making them advantageous in agriculture.
Correct Answer:
B
— Increased crop yield
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Q. What is the main benefit of consuming antioxidants found in fruits and vegetables?
A.
Increase energy
B.
Reduce inflammation
C.
Enhance digestion
D.
Improve vision
Show solution
Solution
Antioxidants help reduce inflammation and combat oxidative stress in the body.
Correct Answer:
B
— Reduce inflammation
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Q. What is the main benefit of consuming cruciferous vegetables like broccoli and kale?
A.
High protein content
B.
Rich in antioxidants
C.
Low calorie count
D.
High fat content
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Solution
Cruciferous vegetables are rich in antioxidants, which help protect against diseases.
Correct Answer:
B
— Rich in antioxidants
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Q. What is the main benefit of consuming dietary fiber from plants?
A.
Increased energy
B.
Improved digestion
C.
Enhanced taste
D.
Faster metabolism
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Solution
Dietary fiber aids in digestion and helps maintain gut health.
Correct Answer:
B
— Improved digestion
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Q. What is the main benefit of consuming omega-3 fatty acids found in certain plants?
A.
Improved digestion
B.
Enhanced cognitive function
C.
Increased energy
D.
Better skin hydration
Show solution
Solution
Omega-3 fatty acids, found in plants like flaxseed, are known to enhance cognitive function and support brain health.
Correct Answer:
B
— Enhanced cognitive function
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Q. What is the main byproduct of photosynthesis?
A.
Oxygen
B.
Carbon dioxide
C.
Glucose
D.
Water
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Solution
Oxygen is released as a byproduct of photosynthesis during the light reactions.
Correct Answer:
A
— Oxygen
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Q. What is the main characteristic of sclerenchyma cells?
A.
Flexible and living at maturity
B.
Thick, lignified cell walls and dead at maturity
C.
Thin cell walls and living at maturity
D.
Photosynthetic and living at maturity
Show solution
Solution
Sclerenchyma cells have thick, lignified walls and are dead at maturity, providing structural support.
Correct Answer:
B
— Thick, lignified cell walls and dead at maturity
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Q. What is the main component of the plant cell wall?
A.
Cellulose
B.
Chitin
C.
Lignin
D.
Pectin
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Solution
Cellulose is the primary structural component of the plant cell wall, providing rigidity and strength.
Correct Answer:
A
— Cellulose
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Q. What is the main difference between aerobic and anaerobic respiration in plants?
A.
Oxygen requirement
B.
Energy yield
C.
Location in the plant
D.
Type of glucose used
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Solution
The main difference is that aerobic respiration requires oxygen, while anaerobic respiration does not.
Correct Answer:
A
— Oxygen requirement
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Q. What is the main difference between disinfection and sterilization?
A.
Disinfection kills all microbes; sterilization does not
B.
Sterilization kills all microbes; disinfection reduces microbial load
C.
Disinfection is used on inanimate objects; sterilization is not
D.
There is no difference
Show solution
Solution
Sterilization kills all microbes, while disinfection reduces the number of viable organisms but may not eliminate all.
Correct Answer:
B
— Sterilization kills all microbes; disinfection reduces microbial load
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Q. What is the main difference between respiration and photosynthesis in plants?
A.
Respiration occurs only at night
B.
Photosynthesis produces energy, respiration consumes it
C.
Respiration occurs in chloroplasts, photosynthesis in mitochondria
D.
Photosynthesis requires light, respiration does not
Show solution
Solution
Photosynthesis requires light to produce glucose, while respiration does not require light and occurs continuously.
Correct Answer:
D
— Photosynthesis requires light, respiration does not
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Q. What is the main difference between sterilization and disinfection?
A.
Sterilization kills all microbes; disinfection reduces them
B.
Disinfection kills all microbes; sterilization reduces them
C.
Sterilization is faster than disinfection
D.
Disinfection is only for surfaces, sterilization is for instruments
Show solution
Solution
Sterilization kills all microbes, while disinfection reduces the number of viable microorganisms.
Correct Answer:
A
— Sterilization kills all microbes; disinfection reduces them
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Q. What is the main ecological benefit of seed dispersal?
A.
Increases competition among plants
B.
Promotes genetic uniformity
C.
Facilitates colonization of new habitats
D.
Reduces plant diversity
Show solution
Solution
Seed dispersal allows plants to spread their offspring over a wider area, facilitating colonization of new habitats and enhancing biodiversity.
Correct Answer:
C
— Facilitates colonization of new habitats
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Q. What is the main energy carrier produced during the light reactions?
A.
NADPH
B.
ATP
C.
FADH2
D.
Glucose
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Solution
ATP is the main energy carrier produced during the light reactions of photosynthesis.
Correct Answer:
B
— ATP
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Q. What is the main energy currency produced during the light reactions?
A.
NADPH
B.
FADH2
C.
ATP
D.
Glucose
Show solution
Solution
ATP is the main energy currency produced during the light reactions of photosynthesis.
Correct Answer:
C
— ATP
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Q. What is the main enzyme involved in the carbon fixation process during the dark reactions?
A.
RUBISCO
B.
ATP synthase
C.
NADP+ reductase
D.
Phosphofructokinase
Show solution
Solution
RUBISCO is the main enzyme that catalyzes the fixation of carbon dioxide in the dark reactions.
Correct Answer:
A
— RUBISCO
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Q. What is the main function of alkaloids in plants?
A.
Energy storage
B.
Defense against herbivores
C.
Water retention
D.
Photosynthesis
Show solution
Solution
Alkaloids serve as a defense mechanism against herbivores due to their toxicity.
Correct Answer:
B
— Defense against herbivores
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Q. What is the main function of antioxidants found in plants?
A.
Promote growth
B.
Prevent oxidative stress
C.
Aid in reproduction
D.
Enhance photosynthesis
Show solution
Solution
Antioxidants help prevent oxidative stress by neutralizing free radicals.
Correct Answer:
B
— Prevent oxidative stress
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Q. What is the main function of chlorophyll in plants?
A.
Water absorption
B.
Nutrient transport
C.
Light absorption
D.
Gas exchange
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Solution
Chlorophyll's main function is to absorb light energy for photosynthesis.
Correct Answer:
C
— Light absorption
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Q. What is the main function of cytotoxic T cells?
A.
Produce antibodies
B.
Kill infected or cancerous cells
C.
Activate B cells
D.
Secrete cytokines
Show solution
Solution
Cytotoxic T cells are primarily responsible for killing infected or cancerous cells.
Correct Answer:
B
— Kill infected or cancerous cells
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Q. What is the main function of phagocytes in the immune system?
A.
To produce antibodies
B.
To present antigens
C.
To engulf and digest pathogens
D.
To secrete cytokines
Show solution
Solution
Phagocytes, such as macrophages and neutrophils, are specialized cells that engulf and digest pathogens, playing a key role in the innate immune response.
Correct Answer:
C
— To engulf and digest pathogens
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Q. What is the main function of phloem in plants?
A.
Transport water
B.
Transport nutrients
C.
Transport sugars
D.
Support structure
Show solution
Solution
Phloem is responsible for transporting sugars and other metabolic products downward from the leaves.
Correct Answer:
C
— Transport sugars
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Q. What is the main function of phloem in vascular plants?
A.
Transport water
B.
Transport nutrients
C.
Transport sugars
D.
Support structure
Show solution
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 plant leaves in relation to photosynthesis?
A.
Water storage
B.
Gas exchange
C.
Nutrient absorption
D.
Support
Show solution
Solution
Leaves are primarily responsible for gas exchange, allowing carbon dioxide to enter and oxygen to exit during photosynthesis.
Correct Answer:
B
— Gas exchange
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Q. What is the main function of root hairs?
A.
Photosynthesis
B.
Nutrient absorption
C.
Support
D.
Storage
Show solution
Solution
Root hairs increase the surface area for water and nutrient absorption from the soil.
Correct Answer:
B
— Nutrient absorption
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Q. What is the main function of sclerenchyma cells in plants?
A.
Photosynthesis
B.
Support
C.
Storage
D.
Transport
Show solution
Solution
Sclerenchyma cells provide structural support to the plant.
Correct Answer:
B
— Support
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Q. What is the main function of stomata in plant leaves?
A.
Nutrient absorption
B.
Gas exchange
C.
Water storage
D.
Photosynthesis
Show solution
Solution
Stomata are small openings that facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer:
B
— Gas exchange
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