50 Biology Quiz Questions and Answers

Are you ready to begin your journey of discovery through the intricate workings of life?

Or maybe you fancy yourself as the next Charles Darwin or Rachel Carson?

Biology, the study of living organisms, is a captivating field that unveils the mysteries of everything from microscopic cells to complex ecosystems.

Whether you are an aspiring biologist, a curious science enthusiast, or simply eager to challenge yourself, this quiz on biology has something for everyone.

Think plants, animals, humans, and even mushrooms – biological studies are vast and exciting, with new discoveries still being made!

By branching out into many subcategories such as human biology, botany, marine biology and zoology, we have this extensive topic pretty much covered, so prepare yourself for these 50 biology quiz questions and answers.

It’s time to flex those mental muscles and get your blood pumping!

Biology Quiz Questions and Answers


  1. What is the natural compound present in green plants that gives them their colour?
  2. Where would one find the smallest bone in the human body?
  3. Which organ remove wastes and extra fluid from your body?
  4. What is the biggest animal on the planet?
  5. What hormone regulates blood sugar levels by allowing cells to absorb and use glucose for energy?
  6. What is the largest muscle in the human body?
  7. A gamete is a reproductive cell. True or false?
  8. What viscous substance produced by various glands and cells in the body is commonly found in the respiratory, digestive, and reproductive systems?
  9. Where is the femur located?
  10. What is the largest bone in the human skull?
  11. In degrees Celsius, what is the average body temperature of a healthy human?
  12. What animal is created when a male lion and a tigress breed?
  13. What flexible tube-like structure connects a developing foetus to the placenta in the womb?
  14. What is the most common blood group in the UK?
  15. What is the name for the male reproductive parts of a flower?
  16. Which gas do plants release during photosynthesis?
  17. What is the process called when a caterpillar develops into a butterfly?
  18. Which part of the body makes platelets?
  19. Which plant tissue is responsible for transporting water and nutrients from the roots to the rest of the plant?
  20. Including wisdom teeth, how many permanent teeth does the average adult human have?
  21. Which protein helps form hair, nails and your skin’s outer layer?
  22. A swiss cheese plant is technically known as what?
  23. The movement of water molecules through a cell’s partially permeable membrane is known as what?
  24. The fat in a camel’s hump is mainly for thermoregulation. True or false?
  25. How many layers are there in a tree trunk?
  26. The fly agaric belongs to what kingdom?
  27. Jelly fishes have hearts. True or False?
  28. What is the scientific term for the study of mushrooms?
  29. What fine powder containing male reproductive cells of plants is typically transported by insects, wind, or water for fertilisation?
  30. What are the four main chambers of the human heart?
  31. Which British scientist is best known for his work with James Watson which led to the identification of the structure of DNA in 1953?
  32. What is the name of the process used by bats to see objects using reflected sound?
  33. Are corals classified as animals, stones or plants?
  34. Which type of salamander is also known as a Mexican walking fish?
  35. What is the largest species of shark in the world?
  36. What is a plants growth response to touch called?
  37. What is the name of the light-sensitive pigment found in the rod cells of the retina?
  38. How many months is the average gestation period for elephants?
  39. Which organ stores bile?
  40. Which succulent plant is used to make tequila?
  41. Which gland in the human body is often referred to as the ‘master gland’?
  42. What are the two main types of plankton?
  43. Where in the human brain is respiration controlled?
  44. Phytotoxicology is the study of what?
  45. What is the white area of the eye called?
  46. What is the human body’s largest organ?
  47. The lionfish is native to which ocean region?
  48. Iris foetidissima, the stinking iris, gladdon, Gladwin iris, or stinking gladwin is also known as the roast-beef plant. True or false?
  49. DNA stands for deoxyribonucleic acid. True or false?
  50. Which plant hormones are responsible for promoting cell elongation and stem growth?

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  1. Chlorophyll
  2. The ear
  3. The kidneys
  4. The Blue Whale
  5. Insulin
  6. Gluteus maximus
  7. True
  8. Mucus
  9. The thigh
  10. Mandible (jawbone)
  11. 37 degrees Celsius
  12. A liger
  13. The umbilical cord
  14. Blood Group O
  15. The stamens
  16. Oxygen
  17. Metamorphosis
  18. The bone marrow
  19. Xylem
  20. 32
  21. Keratin
  22. Monstera
  23. Osmosis
  24. True
  25. Five
  26. Fungi
  27. False
  28. Mycology
  29. Pollen
  30. The left atrium, the right atrium, the left ventricle & the right ventricle.
  31. Francis Crick
  32. Echolocation
  33. Animals
  34. Axolotl
  35. Whale shark
  36. Thigmotropism
  37. Rhodopsin
  38. 22 months
  39. The gall bladder
  40. Blue agave
  41. The pituitary gland
  42. Phytoplankton & zooplankton
  43. Medulla oblongata
  44. The study of plant poisons
  45. The sclera
  46. The skin
  47. The South Pacific & Indian Oceans (the Indo-Pacific)
  48. True
  49. True
  50. Auxins

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