Biology – General Science MCQs for GK paper in competitive exams. Important questions from previous year exam papers for free online practice.
Biology GK MCQs
Question 1: Which of the following is commonly known as a blood thinner?
A) Coagulation inhibitor
B) Antibiotic
C) Immunosuppressant
D) Anticoagulant
Explanation: Anticoagulants are commonly known as blood thinners and are used to treat and prevent blood clots. Antibiotics are medications used to treat bacterial infections.
Question 2: Bile is stored in a sac called __________.
A) Gallbladder
B) Urinary bladder
C) Pancreas
D) Liver
Explanation: Bile is produced in the liver and stored in the gallbladder in the human digestive system.
Question 3: What is the pH of human blood?
A) 7.4
B) 10
C) 6.5
D) 5.8
Explanation: The pH value of human blood is 7.4, which makes it alkaline in nature.
Question 4: Which of the following plant kingdom groups is known as algae?
A) Bryophyta
B) Thallophyta
C) Angiosperm
D) Pteridophyta
Explanation: Thallophytes are commonly known as algae. Most of them are aquatic and represent a primitive form of plant life without vascular tissues for transporting water and minerals.
Question 5: Deficiency of which vitamin causes swollen neck glands?
A) Vitamin C
B) Iodine
C) Calcium
D) Vitamin D
Explanation: Swelling in the neck glands is generally associated with iodine deficiency.
Question 6: Which of the following belongs to the Platyhelminthes classification under the kingdom Animalia?
A) Tapeworm
B) Leech
C) Wuchereria
D) Sycon
Explanation: Tapeworm is an invertebrate parasite that lives in the bodies of vertebrates, including humans. Some species can grow up to 100 feet (30 meters) long, and their bodies are ribbon-like and segmented.
Question 7: In the cytoplasm, ribosomes, mitochondria, and Golgi apparatus are examples of __________.
A) Organs
B) Cells
C) Organelles
D) Tissues
Explanation: Golgi apparatus, also known as the Golgi body, is an organelle found in most eukaryotic cells.
Question 8: What is the normal body temperature of humans?
A) 98.6°C
B) 98.6°F
C) 37°F
D) 40°C
Explanation: The normal body temperature is around 98.6°F (37°C). Fever is usually indicated by a temperature above 100.4°F (38°C).
Question 9: In which part of the plant does the process of respiration occur?
A) Roots
B) Stem
C) Leaves
D) Flowers
Explanation: The leaves perform respiration by absorbing oxygen and releasing carbon dioxide.
Question 10: How many major systems are there in the human body?
A) 7
B) 10
C) 12
D) 5
Explanation: There are 12 major systems in the human body, such as the digestive system, respiratory system, circulatory system, etc.
Question 11: What is the full form of DNA?
A) Deoxyribonucleic Acid
B) Deoxyribonucleotide Acid
C) Deoxyribonuclear Acid
D) Deoxynucleic Acid
Explanation: The full form of DNA is Deoxyribonucleic Acid, which stores genetic information.
Question 12: By which process do herbivorous plants prepare food?
A) Respiration
B) Photosynthesis
C) Maturation
D) Regeneration
Explanation: Herbivorous plants prepare food through photosynthesis, which uses sunlight, water, and carbon dioxide.
Question 13: Which is the largest gland in the human body?
A) Pancreas
B) Liver
C) Pituitary Gland
D) Thyroid
Explanation: The liver is the largest gland in the human body and performs many important functions.
Question 14: What is an enzyme?
A) A type of vitamin
B) A type of acid
C) A type of protein
D) A type of mineral
Explanation: An enzyme is a type of protein that accelerates biological chemical reactions.
Question 15: What is the function of papillae?
A) Digesting food
B) Regulating body temperature
C) Detoxifying the body
D) Solidifying blood
Explanation: Papillae in the stomach help in digesting food.
Question 16: Which cell has a cell membrane?
A) Animal cell
B) Plant cell
C) Bacterial cell
D) All cells
Explanation: All cells have a cell membrane that separates the cell from its external environment.
Question 17: Which organ is not part of the central nervous system?
A) Brain
B) Spinal cord
C) Nerve
D) Brain and spinal cord
Explanation: Nerves are not part of the central nervous system; the brain and spinal cord are.
Question 18: Where is energy produced in a cell?
A) Nucleus
B) Mitochondria
C) Chloroplast
D) Ribosome
Explanation: Mitochondria produce the cell’s energy, known as ATP.
Question 19: Where is cartilage found?
A) In bones
B) In the skin
C) In the blood
D) In the nails
Explanation: Cartilage is found in bones and helps to lubricate joints.
Question 20: Which enzyme aids in chemical digestion?
A) Pancreatic lipase
B) Lactase
C) Amylase
D) All
Explanation: Pancreatic lipase, lactase, and amylase all aid in chemical digestion.
Question 21: Which gas is primarily used in the process of photosynthesis?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Hydrogen
Explanation: Carbon dioxide is primarily used in the process of photosynthesis.
Question 22: Where is a virus found?
A) Microorganisms
B) Plants
C) Animals
D) Bacteria
Explanation: A virus is found in microorganisms, such as viruses.
Question 23: In which organ does the first digestion of food occur?
A) Stomach
B) Mouth
C) Intestine
D) Esophagus
Explanation: The first digestion of food occurs in the mouth, where enzymes initiate the digestion process.
Question 24: What is the study of microorganisms called?
A) Biology
B) Microbiology
C) Physiology
D) Ecology
Explanation: The study of microorganisms is called microbiology.
Question 25: Which organ purifies the blood?
A) Liver
B) Heart
C) Kidneys
D) Lungs
Explanation: The kidneys purify the blood and remove waste products.
Question 26: Which part of the papillary helps in digestion?
A) Gastric juice
B) Hydrochloric acid
C) Pepsin
D) All of the above
Explanation: Gastric juice, hydrochloric acid, and pepsin all help in digestion.
Question 27: What is not present in living cells?
A) Mitochondria
B) Chloroplast
C) Lysosomes
D) Volcans
Explanation: Volcans are not found in living cells, whereas mitochondria, chloroplast, and lysosomes are present in cells.
Question 28: What condition arises due to a lack of oxygen?
A) Hypoxia
B) Hyperthermia
C) Hypoglycemia
D) Hypothermia
Explanation: Hypoxia is a condition that arises due to a lack of oxygen, where the body’s tissues do not receive enough oxygen.
Question 29: What is the main organ for food transportation in plants?
A) Roots
B) Leaves
C) Stem
D) Flowers
Explanation: The stem is the main organ for food transportation in plants.
Question 30: How many major types of cells are there in human blood?
A) 2
B) 3
C) 4
D) 5
Explanation: There are four major types of cells in human blood: red blood cells, white blood cells, platelets, and blood plasma.
Question 31: What controls cognitive functions?
A) Heart
B) Brain
C) Kidneys
D) Liver
Explanation: Cognitive functions, such as thinking and processing, are controlled by the brain.
Question 32: What is the function of genes?
A) Digestion of food
B) Production of energy
C) Storage of genetic information
D) Formation of blood
Explanation: Genes store genetic information and transfer it to the next generation.
Question 33: What is the function of mitochondria?
A) Production of energy
B) Protein synthesis
C) Cell division
D) Cell structure
Explanation: Mitochondria produce energy in the cell.
Question 34: What type of organism are bacteria?
A) Unicellular
B) Multicellular
C) Viruses
D) Fungi
Explanation: Bacteria are unicellular organisms.
Question 35: During which stage of the nutrition process is the most energy obtained?
A) Digestion of carbohydrates
B) Digestion of proteins
C) Digestion of fats
D) All equally
Explanation: Digestion of fats provides the most energy.
Question 36: Which gland plays a major role in body growth?
A) Thyroid
B) Pituitary
C) Pancreas
D) Liver
Explanation: The pituitary gland plays a major role in the growth of the body.
Question 37: Deficiency of which vitamin causes rickets?
A) Vitamin A
B) Vitamin B
C) Vitamin D
D) Vitamin C
Explanation: Vitamin D deficiency leads to rickets (bone weakness).[
Question 38: What type of antibodies are found in blood group A?
A) B antibodies
B) A antibodies
C) AB antibodies
D) O antibodies
Explanation: Blood group A has B antibodies.
Question 39: What studies the ecosystem?
A) Zoology
B) Botany
C) Ecology
D) Microbiology
Explanation: The study of ecosystems is done by ecology.
Question 40: What is a neuron?
A) Blood cell
B) Nerve cell
C) Digestive cell
D) Liver cell
Explanation: A neuron is a nerve cell and an essential part of the nervous system.
Question 41: Which organ produces hormones?
A) Heart
B) Liver
C) Thyroid
D) Kidneys
Explanation: The thyroid produces hormones that control many vital functions in the body.
Question 42: Which organ plays a major role in the process of respiration?
A) Heart
B) Lungs
C) Liver
D) Kidneys
Explanation: The lungs play a major role in respiration, facilitating the exchange of oxygen.
Question 43: In the digestive system, which organ produces digestive enzymes?
A) Liver
B) Pancreas
C) Stomach
D) Intestine
Explanation: The pancreas produces digestive enzymes that aid in food digestion.
Question 44: Which organ in plant cells assists in photosynthesis?
A) Mitochondria
B) Chloroplast
C) Ribosome
D) Nucleus
Explanation: Chloroplasts assist in photosynthesis in plant cells.
Question 45: What is the largest organ in the human body?
A) Heart
B) Liver
C) Skin
D) Kidneys
Explanation: The skin is the largest organ in the human body.
Question 46: A deficiency of Vitamin C leads to which disease?
A) Rickets
B) Scurvy
C) Pellagra
D) Burkitt’s
Explanation: A deficiency of Vitamin C leads to scurvy, which causes swollen and bleeding gums.
Question 47: What is the largest cell in the human body?
A) Human Egg
B) Red Blood Cell
C) Liver Cell
D) Nerve Cell
Explanation: The human egg (ovum) is the largest cell in the human body.
Question 48: What is considered the best sensory organ?
A) Eye
B) Ear
C) Skin
D) Nose
Explanation: The skin is considered the best sensory organ because it can sense many stimuli.
Question 49: Which nutrient is most essential for nutrition?
A) Carbohydrates
B) Protein
C) Fats
D) Vitamins
Explanation: Carbohydrates are the main source of energy and are thus the most essential.
Question 50: What is the name of the plant hormone that regulates growth?
A) Ethylene
B) Auxin
C) Cytokinin
D) Gibberellin
Explanation: Auxin controls the growth of plants.
Question 51: Which organ regulates blood pressure?
A) Heart
B) Kidneys
C) Liver
D) Lungs
Explanation: The kidneys play an important role in regulating blood pressure.
Question 52: What is the study of the remains of organisms called?
A) Paleontology
B) Genetics
C) Ecology
D) Microbiology
Explanation: The study of the remains of organisms is called Paleontology.
Question 53: What part is included in the structure of a virus?
A) Nucleus
B) Protein coat
C) Mitochondria
D) Chloroplast
Explanation: The structure of a virus includes a protein coat that protects the genetic material.
Question 54: Which part of the plant absorbs water?
A) Leaves
B) Stem
C) Roots
D) Flowers
Explanation: Water is primarily absorbed by the roots of plants.
Question 55: What does Maltase digest?
A) Proteins
B) Fats
C) Carbohydrates
D) Vitamins
Explanation: The enzyme Maltase digests carbohydrates.
Question 56: In which part of the body does fat digestion occur?
A) Stomach
B) Intestine
C) Liver
D) Kidneys
Explanation: Fat digestion primarily occurs in the intestine.
Question 57: Which organ plays a major role in drug absorption?
A) Mouth
B) Stomach
C) Intestine
D) Liver
Explanation: Drug absorption primarily takes place in the intestine.
Question 58: Where are RBCs produced in the body?
A) Liver
B) Kidneys
C) Bone marrow
D) Liver
Explanation: Red blood cells (RBCs) are produced in the bone marrow.
Question 59: What is the most important organ in the process of respiration?
A) Heart
B) Lungs
C) Liver
D) Kidneys
Explanation: The lungs are the most important organs in the process of respiration.
Question 59: Who proposed the theory of natural selection?
A) Louis Pasteur
B) Charles Darwin
C) Gregor Mendel
D) Robert Hooke
Explanation: The theory of natural selection was proposed by Charles Darwin.
Question 60: Which organ is responsible for the production of red blood cells?
A) Bone marrow
B) Heart
C) Brain
D) Lungs
Explanation: Red blood cells, most white blood cells, and platelets are produced in the bone marrow.