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. Which of the following tissues is responsible for secondary growth in plants?
A.
Cortex
B.
Phloem
C.
Vascular cambium
D.
Epidermis
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Solution
The vascular cambium is responsible for secondary growth, producing additional xylem and phloem.
Correct Answer:
C
— Vascular cambium
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Q. Which of the following vaccines is a live attenuated vaccine?
A.
Influenza vaccine
B.
MMR (Measles, Mumps, Rubella) vaccine
C.
Hepatitis B vaccine
D.
Tetanus toxoid vaccine
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Solution
The MMR vaccine contains live attenuated viruses that stimulate an immune response without causing the disease.
Correct Answer:
B
— MMR (Measles, Mumps, Rubella) vaccine
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Q. Which organ is primarily responsible for detoxifying chemicals in the human body?
A.
Kidney
B.
Liver
C.
Heart
D.
Lungs
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Solution
The liver plays a crucial role in detoxifying chemicals and metabolizing drugs.
Correct Answer:
B
— Liver
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Q. Which organ is primarily responsible for filtering blood in mammals?
A.
Liver
B.
Heart
C.
Kidneys
D.
Lungs
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Solution
The kidneys are primarily responsible for filtering blood and removing waste products from the body.
Correct Answer:
C
— Kidneys
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Q. Which organ produces bile that aids in the digestion of fats?
A.
Pancreas
B.
Liver
C.
Gallbladder
D.
Stomach
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Solution
The liver produces bile, which is stored in the gallbladder and released into the small intestine to help digest fats.
Correct Answer:
B
— Liver
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Q. Which organ produces bile?
A.
Pancreas
B.
Liver
C.
Gallbladder
D.
Stomach
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Solution
The liver produces bile, which is stored in the gallbladder and helps in the digestion of fats.
Correct Answer:
B
— Liver
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Q. Which organelle is involved in the degradation of waste materials in plant cells?
A.
Lysosome
B.
Chloroplast
C.
Vacuole
D.
Mitochondrion
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Solution
Lysosomes contain enzymes that break down waste materials and cellular debris in plant cells.
Correct Answer:
A
— Lysosome
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Q. Which organelle is involved in the detoxification of harmful substances in plant cells?
A.
Lysosome
B.
Peroxisome
C.
Vacuole
D.
Chloroplast
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Solution
Peroxisomes are involved in the detoxification of harmful substances and the breakdown of fatty acids in plant cells.
Correct Answer:
B
— Peroxisome
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Q. Which organelle is known as the powerhouse of the cell?
A.
Ribosome
B.
Mitochondrion
C.
Chloroplast
D.
Endoplasmic reticulum
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Solution
Mitochondria are known as the powerhouse of the cell because they generate ATP through cellular respiration.
Correct Answer:
B
— Mitochondrion
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Q. Which organelle is primarily responsible for respiration in plant cells?
A.
Chloroplast
B.
Mitochondria
C.
Nucleus
D.
Endoplasmic reticulum
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Solution
Mitochondria are the organelles responsible for respiration, where energy production occurs.
Correct Answer:
B
— Mitochondria
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Q. Which part of the brain is responsible for regulating balance and coordination?
A.
Cerebrum
B.
Cerebellum
C.
Brainstem
D.
Thalamus
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Solution
The cerebellum is responsible for coordinating voluntary movements and maintaining balance.
Correct Answer:
B
— Cerebellum
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Q. Which part of the brain regulates the rate and depth of breathing?
A.
Cerebrum
B.
Cerebellum
C.
Medulla oblongata
D.
Thalamus
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Solution
The medulla oblongata controls autonomic functions, including the regulation of breathing patterns.
Correct Answer:
C
— Medulla oblongata
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Q. Which part of the brain regulates the rate of breathing?
A.
Cerebrum
B.
Cerebellum
C.
Medulla oblongata
D.
Thalamus
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Solution
The medulla oblongata is responsible for regulating the rate and depth of breathing based on the body's needs.
Correct Answer:
C
— Medulla oblongata
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Q. Which part of the brain regulates the respiratory rate?
A.
Cerebrum
B.
Cerebellum
C.
Medulla oblongata
D.
Thalamus
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Solution
The medulla oblongata is the part of the brain that regulates the respiratory rate by responding to carbon dioxide levels in the blood.
Correct Answer:
C
— Medulla oblongata
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Q. Which part of the chloroplast contains the thylakoid membranes?
A.
Stroma
B.
Outer membrane
C.
Inner membrane
D.
Granum
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Solution
The granum is a stack of thylakoids where the light-dependent reactions occur.
Correct Answer:
D
— Granum
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Q. Which part of the chloroplast is responsible for the Calvin cycle?
A.
Thylakoid membrane
B.
Stroma
C.
Granum
D.
Chlorophyll
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Solution
The Calvin cycle occurs in the stroma of the chloroplast.
Correct Answer:
B
— Stroma
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Q. Which part of the digestive system is primarily involved in water absorption?
A.
Stomach
B.
Small intestine
C.
Large intestine
D.
Esophagus
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Solution
The large intestine is primarily responsible for the absorption of water from indigestible food matter.
Correct Answer:
C
— Large intestine
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Q. Which part of the digestive system is primarily responsible for water absorption?
A.
Mouth
B.
Stomach
C.
Small intestine
D.
Large intestine
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Solution
The large intestine is primarily responsible for the absorption of water and electrolytes from indigestible food matter.
Correct Answer:
D
— Large intestine
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Q. Which part of the flower develops into a fruit after fertilization?
A.
Stamen
B.
Ovary
C.
Petal
D.
Sepal
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Solution
The ovary of the flower develops into a fruit after fertilization, enclosing the seeds.
Correct Answer:
B
— Ovary
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Q. Which part of the flower develops into the fruit?
A.
Stamen
B.
Ovary
C.
Petal
D.
Sepal
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Solution
The ovary of the flower develops into the fruit after fertilization, enclosing the seeds.
Correct Answer:
B
— Ovary
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Q. Which part of the flower is primarily responsible for attracting pollinators?
A.
Stamen
B.
Pistil
C.
Petals
D.
Sepals
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Solution
Petals are often brightly colored and serve to attract pollinators to the flower.
Correct Answer:
C
— Petals
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Q. Which part of the flower is primarily responsible for reproduction?
A.
Sepals
B.
Petals
C.
Stamens
D.
Leaves
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Solution
Stamens are the male reproductive parts of the flower, producing pollen.
Correct Answer:
C
— Stamens
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Q. Which part of the flower is responsible for attracting pollinators?
A.
Sepals
B.
Petals
C.
Stamens
D.
Carpels
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Solution
Petals are often brightly colored and serve to attract pollinators to the flower.
Correct Answer:
B
— Petals
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Q. Which part of the flower is responsible for producing ovules?
A.
Stamen
B.
Pistil
C.
Petal
D.
Sepal
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Solution
The pistil is the female reproductive part of the flower that produces ovules.
Correct Answer:
B
— Pistil
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Q. Which part of the flower is responsible for producing pollen?
A.
Stigma
B.
Style
C.
Anther
D.
Ovary
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Solution
The anther is the part of the stamen that produces and contains pollen.
Correct Answer:
C
— Anther
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Q. Which part of the heart is responsible for pumping blood to the lungs?
A.
Left atrium
B.
Right atrium
C.
Left ventricle
D.
Right ventricle
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Solution
The right ventricle pumps deoxygenated blood to the lungs for oxygenation.
Correct Answer:
D
— Right ventricle
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Q. Which part of the heart is responsible for pumping oxygenated blood to the body?
A.
Right atrium
B.
Left atrium
C.
Right ventricle
D.
Left ventricle
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Solution
The left ventricle is responsible for pumping oxygenated blood to the body.
Correct Answer:
D
— Left ventricle
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Q. Which part of the human digestive system is primarily involved in water absorption?
A.
Stomach
B.
Small intestine
C.
Large intestine
D.
Esophagus
Show solution
Solution
The large intestine is primarily responsible for the absorption of water from indigestible food matter.
Correct Answer:
C
— Large intestine
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Q. Which part of the plant cell is selectively permeable?
A.
Cell wall
B.
Cytoplasm
C.
Cell membrane
D.
Chloroplast
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Solution
The cell membrane is selectively permeable, controlling the movement of substances in and out of the cell.
Correct Answer:
C
— Cell membrane
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Q. Which part of the plant is often used to extract essential oils that have antimicrobial properties?
A.
Roots
B.
Leaves
C.
Flowers
D.
Seeds
Show solution
Solution
Leaves are commonly used to extract essential oils known for their antimicrobial properties.
Correct Answer:
B
— Leaves
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