Top 100 Biology Questions for CBSE Class 6 to 12

CBSE Important Questions for Biology in classes 6 through 12 are made by experts in the subject. They’re really helpful for students when they’re getting ready for their exams. These questions are like a roadmap for preparing for different exams, whether it’s for the board or for competitive ones.

Biology is super important for students who want to do well in medical entrance exams like JEE, AIIMS, NEET, and others. To succeed in these exams, you need to have a good grasp of biology. That’s why having these important questions for Class 6 to 12 Biology is crucial for students.

When you’re gearing up for competitive exams, you need to be really well-prepared. That’s why we’ve got you covered with all the essential CBSE Important Questions. These questions are based on the NCERT textbook, which is the main reference book for CBSE students.

Question: What is photosynthesis?

Answer: Photosynthesis is the process by which green plants make their own food using sunlight, water, and carbon dioxide.

Question: What are the parts of a plant?

Answer: The main parts of a plant are the roots, stem, leaves, flowers, and fruits.

Question: What is the function of roots?

Answer: Roots absorb water and nutrients from the soil and anchor the plant in the ground.

Question: What do leaves do?

Answer: Leaves are responsible for photosynthesis and transpiration.

Question: What is a habitat?

Answer: A habitat is the natural environment where an organism lives.

Question: What are herbivores?

Answer: Herbivores are animals that eat only plants.

Question: What are carnivores?

Answer: Carnivores are animals that eat other animals.

Question: What is the difference between a food chain and a food web?

Answer: A food chain shows a single path of energy flow in an ecosystem, while a food web shows multiple interconnected food chains.

Question: What are the main components of the human digestive system?

Answer: The main components are the mouth, esophagus, stomach, small intestine, large intestine, and anus.

Question: What is digestion?

Answer: Digestion is the process of breaking down food into smaller components that can be absorbed by the body.

Question: What is the function of the heart?

Answer: The heart pumps blood throughout the body, supplying oxygen and nutrients to tissues.

Question: What are the different types of blood cells?

Answer: There are red blood cells, white blood cells, and platelets.

Question: What is the function of red blood cells?

Answer: Red blood cells carry oxygen from the lungs to the rest of the body.

Question: What do white blood cells do?

Answer: White blood cells help fight infections.

Question: What are platelets?

Answer: Platelets help in blood clotting to prevent bleeding.

Question: What is respiration?

Answer: Respiration is the process of taking in oxygen and releasing carbon dioxide.

Question: What is the function of the lungs?

Answer: The lungs are responsible for exchanging oxygen and carbon dioxide between the blood and the air.

Question: What are the main parts of the nervous system?

Answer: The main parts are the brain, spinal cord, and nerves.

Question: What is the function of the brain?

Answer: The brain controls and coordinates body activities and processes information.

Question: What are the sense organs?

Answer: The sense organs are eyes, ears, nose, tongue, and skin.

Question: What is a cell?

Answer: A cell is the basic unit of life in all living organisms.

Question: What are the main parts of a cell?

Answer: The main parts are the cell membrane, nucleus, and cytoplasm.

Question: What is the function of the nucleus?

Answer: The nucleus controls cell activities and contains genetic material (DNA).

Question: What is mitosis?

Answer: Mitosis is the process of cell division that results in two identical daughter cells.

Question: What is meiosis?

Answer: Meiosis is a type of cell division that reduces the chromosome number by half, producing four genetically different daughter cells.

Question: What is DNA?

Answer: DNA (deoxyribonucleic acid) is the molecule that carries genetic information in living organisms.

Question: What are genes?

Answer: Genes are segments of DNA that determine specific traits or characteristics.

Question: What is a chromosome?

Answer: A chromosome is a structure made of DNA and proteins that contains genetic information.

Question: What is genetics?

Answer: Genetics is the study of heredity and variation in living organisms.

Question: What is a dominant trait?

Answer: A dominant trait is one that appears in an organism even if only one copy of the gene is present.

Question: What is a recessive trait?

Answer: A recessive trait only appears when two copies of the gene are present.

Question: What is biodiversity?

Answer: Biodiversity refers to the variety of living organisms in a particular area.

Question: What are the levels of biological classification?

Answer: The levels are kingdom, phylum, class, order, family, genus, and species.

Question: What is an ecosystem?

Answer: An ecosystem is a community of living organisms interacting with their physical environment.

Question: What is an adaptation?

Answer: An adaptation is a characteristic that helps an organism survive in its environment.

Question: What is evolution?

Answer: Evolution is the process by which species change over time through genetic variation and natural selection.

Question: What is natural selection?

Answer: Natural selection is the process where organisms with favorable traits are more likely to survive and reproduce.

Question: What is a fossil?

Answer: A fossil is the preserved remains or traces of an organism that lived in the past.

Question: What are microorganisms?

Answer: Microorganisms are tiny living organisms that can only be seen with a microscope, such as bacteria, viruses, and fungi.

Question: What is an antibiotic?

Answer: An antibiotic is a medicine that kills or inhibits the growth of bacteria.

Question: What is a vaccine?

Answer: A vaccine is a substance that stimulates the body’s immune response to prevent infectious diseases.

Question: What is immunity?

Answer: Immunity is the body’s ability to resist or fight off infections and diseases.

Question: What are hormones?

Answer: Hormones are chemical messengers produced by glands that regulate body functions.

Question: What is the endocrine system?

Answer: The endocrine system is a network of glands that produce and release hormones into the bloodstream.

Question: What is homeostasis?

Answer: Homeostasis is the maintenance of a stable internal environment in the body.

Question: What are enzymes?

Answer: Enzymes are proteins that speed up chemical reactions in the body.

Question: What is metabolism?

Answer: Metabolism is the sum of all chemical reactions that occur in an organism to maintain life.

Question: What is osmosis?

Answer: Osmosis is the movement of water molecules through a semi-permeable membrane from an area of low solute concentration to high solute concentration.

Question: What is diffusion?

Answer: Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

Question: What is a tissue?

Answer: A tissue is a group of similar cells that work together to perform a specific function.

Question: What are the four main types of tissues in animals?

Answer: The four main types are epithelial, connective, muscle, and nervous tissues.

Question: What is the skeletal system?

Answer: The skeletal system consists of bones and joints that provide structure and support to the body.

Question: What is the function of muscles?

Answer: Muscles allow movement by contracting and relaxing.

Question: What is the respiratory system?

Answer: The respiratory system is responsible for taking in oxygen and removing carbon dioxide from the body.

Question: What is the circulatory system?

Answer: The circulatory system transports blood, nutrients, gases, and wastes throughout the body.

Question: What is the function of the kidneys?

Answer: The kidneys filter waste products from the blood and produce urine.

Question: What is the function of the liver?

Answer: The liver processes nutrients, detoxifies harmful substances, and produces bile.

Question: What are the main parts of the brain?

Answer: The main parts are the cerebrum, cerebellum, and brainstem.

Question: What is the function of the cerebrum?

Answer: The cerebrum controls voluntary actions, thinking, and memory.

Question: What is the function of the cerebellum?

Answer: The cerebellum coordinates movement and balance.

Question: What is the function of the brainstem?

Answer: The brainstem controls basic life functions such as breathing and heart rate.

Question: What is a neuron?

Answer: A neuron is a nerve cell that transmits electrical signals in the nervous system.

Question: What is a synapse?

Answer: A synapse is the junction between two neurons where signals are transmitted.

Question: What is a reflex?

Answer: A reflex is an automatic response to a stimulus.

Question: What is the reproductive system?

Answer: The reproductive system is responsible for producing offspring.

Question: What are the male reproductive organs?

Answer: The main organs are the testes, penis, and accessory glands.

Question: What are the female reproductive organs?

Answer: The main organs are the ovaries, fallopian tubes, uterus, and vagina.

Question: What is fertilization?

Answer: Fertilization is the fusion of a sperm cell and an egg cell to form a zygote.

Question: What is a zygote?

Answer: A zygote is a fertilized egg cell that develops into an embryo.

Question: What is gestation?

Answer: Gestation is the period of development of the embryo inside the mother’s uterus.

Question: What is puberty?

Answer: Puberty is the stage of development when a person becomes sexually mature.

Question: What is a hormone?

Answer: A hormone is a chemical messenger produced by glands that regulate body functions and processes.

Question: What is the menstrual cycle?

Answer: The menstrual cycle is a series of changes that occur in the female reproductive system to prepare for pregnancy.

Question: What is ovulation?

Answer: Ovulation is the release of an egg cell from the ovary.

Question: What is menstruation?

Answer: Menstruation is the shedding of the uterine lining if pregnancy does not occur.

Question: What is a pathogen?

Answer: A pathogen is a microorganism that causes disease.

Question: What are infectious diseases?

Answer: Infectious diseases are diseases caused by pathogens such as bacteria, viruses, fungi, or parasites.

Question: What is immunity?

Answer: Immunity is the body’s ability to resist or fight off infections and diseases.

Question: What is vaccination?

Answer: Vaccination is the administration of a vaccine to stimulate the body’s immune response and provide immunity against specific diseases.

Question: What is an epidemic?

Answer: An epidemic is the rapid spread of a contagious disease to a large number of people in a given population within a short period.

Question: What is a pandemic?

Answer: A pandemic is an epidemic that spreads over multiple countries or continents, affecting a large number of people.

Question: What are antibiotics?

Answer: Antibiotics are medicines used to treat bacterial infections by killing or inhibiting the growth of bacteria.

Question: What are antiviral drugs?

Answer: Antiviral drugs are medicines used to treat viral infections by inhibiting the replication of viruses.

Question: What is DNA?

Answer: DNA (deoxyribonucleic acid) is the molecule that carries genetic information in living organisms.

Question: What is a gene?

Answer: A gene is a segment of DNA that contains instructions for building proteins and determining specific traits or characteristics.

Question: What is genetic engineering?

Answer: Genetic engineering is the manipulation of an organism’s genetic material to produce desired traits or characteristics.

Question: What is cloning?

Answer: Cloning is the process of producing genetically identical copies of an organism.

Question: What is a mutation?

Answer: A mutation is a change in the DNA sequence that can lead to variations in traits or characteristics.

Question: What is a genome?

Answer: A genome is the complete set of genetic material (DNA) in an organism.

Question: What is a species?

Answer: A species is a group of organisms that can interbreed and produce fertile offspring.

Question: What is biodiversity?

Answer: Biodiversity refers to the variety of living organisms in a particular area.

Question: What is an ecosystem?

Answer: An ecosystem is a community of living organisms interacting with their physical environment.

Question: What is a food chain?

Answer: A food chain is a series of organisms where each one is eaten by the next member in the chain.

Question: What is a food web?

Answer: A food web is a network of interconnected food chains in an ecosystem.

Question: What is a producer?

Answer: A producer is an organism that produces its own food through photosynthesis, such as plants.

Question: What is a consumer?

Answer: A consumer is an organism that obtains energy by eating other organisms, such as animals.

Question: What is a decomposer?

Answer: A decomposer is an organism that breaks down dead plants and animals into simpler substances, such as bacteria and fungi.

Question: What is an omnivore?

Answer: An omnivore is an animal that eats both plants and animals.

Question: What is a carnivore?

Answer: A carnivore is an animal that eats other animals.

Question: What is an herbivore?

Answer: An herbivore is an animal that eats only plants.