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335 Biology GK MCQ question & Answer in English हिन्दी
Biology is the science that studies life and its physicochemical processes. The research is separated into numerous branches for convenience, including botany, zoology, morphology, etc. Let's do a fun quiz about life science that will help us better our knowledge and prepare for competitive exams.
The protein found in nails and hair is:
Keratin provides strength and structure to nails and hair.
The genetic material in most organisms is:
DNA carries genetic instructions for development and function.
Which organ helps detoxify harmful substances in the body?
The liver breaks down toxins and drugs in the bloodstream.
The main function of red blood cells (RBCs) is:
RBCs contain hemoglobin which carries oxygen from lungs to tissues.
. Which organisms fix nitrogen in the soil?
Rhizobium bacteria live in root nodules of legumes and fix atmospheric nitrogen.
Which part of the brain controls heartbeat and breathing?
Medulla oblongata regulates involuntary functions like heartbeat and respiration.
Which enzyme digests protein in the stomach?
Pepsin is secreted by the stomach and breaks down proteins into peptides.
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The malaria parasite is transmitted by:
Female Anopheles mosquitoes transmit Plasmodium during blood meals.
What is the term for animals that eat only plants?
Herbivores feed exclusively on plant material.
DNA replication occurs in which phase of the cell cycle?
S-phase (Synthesis phase) is where DNA is duplicated.
What is the structural and functional unit of the kidney?
Nephron filters blood and forms urine.
Which part of the plant is responsible for photosynthesis?
The leaf contains chloroplasts, which perform photosynthesis.
Which gas is released during photosynthesis?
Plants release oxygen as a by-product of converting CO₂ and water into glucose.
How many chambers are there in the human heart?
The human heart has 2 atria and 2 ventricles for efficient oxygenation and circulation.
Which vitamin is essential for blood clotting?
Vitamin K activates proteins needed for proper blood clotting.
Which disease is caused by a virus?
Measles is a highly contagious viral infection spread through respiratory droplets.
What is the scientific name of humans?
Homo sapiens is the binomial name for modern humans.
Which part of the eye controls the amount of light entering?
The iris regulates the pupil size to control light entry.
What is the function of hemoglobin?
Hemoglobin binds oxygen in red blood cells and delivers it to tissues.
Which of the following is not a connective tissue?
Skin is an epithelial tissue, not connective.
How many chambers are there in the human heart?
The human heart has 2 atria and 2 ventricles for efficient oxygenation and circulation.
Which enzyme is present in human saliva?
Salivary amylase (ptyalin) begins the digestion of starch into sugars.
What is the normal pH of human blood?
A slightly alkaline pH of 7.35–7.45 is essential for normal physiological functions.
Which gas is released during photosynthesis?
Plants release oxygen as a by-product of converting CO₂ and water into glucose.
Which disease is caused by the deficiency of iodine?
Iodine deficiency leads to thyroid gland enlargement, known as goitre.
The largest organ in the human body is:
Skin covers and protects the body, making it the largest organ by surface area.
Which plant tissue is responsible for transport of water?
Xylem carries water and minerals from roots to other parts of the plant.
Which part of the brain controls balance and coordination?
The cerebellum manages posture, balance, and coordinated movements.
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