Biology Quiz

Biology is the study of living things. The quiz covers cells, human body systems, plants, genetics and the basics of ecology and evolution.

What this quiz covers

Study tip: Link each organ or structure to its function in one sentence; function-based questions become straightforward.

Questions, answers and explanations

1. What is the basic structural and functional unit of life?

  1. Atom
  2. Cell
  3. Tissue
  4. Organ

Answer: Cell

The cell is the basic structural and functional unit of all living organisms.

2. Which organ pumps blood throughout the human body?

  1. Lungs
  2. Brain
  3. Heart
  4. Kidney

Answer: Heart

The heart pumps blood to all parts of the body.

3. Which gas do plants absorb during photosynthesis?

  1. Oxygen
  2. Nitrogen
  3. Carbon Dioxide
  4. Hydrogen

Answer: Carbon Dioxide

Plants absorb carbon dioxide and release oxygen during photosynthesis.

4. DNA stands for:

  1. Deoxyribonucleic Acid
  2. Dioxyribonucleic Acid
  3. Dynamic Nuclear Acid
  4. Double Nuclear Acid

Answer: Deoxyribonucleic Acid

DNA is the hereditary material in almost all living organisms.

5. Which blood cells help fight infections?

  1. Red Blood Cells
  2. White Blood Cells
  3. Platelets
  4. Plasma

Answer: White Blood Cells

White blood cells protect the body against infections and diseases.

6. Which organ is primarily responsible for filtering blood in the human body?

  1. Heart
  2. Liver
  3. Kidney
  4. Lungs

Answer: Kidney

The kidneys filter waste products and excess water from the blood.

7. What is the largest organ in the human body?

  1. Liver
  2. Brain
  3. Skin
  4. Lungs

Answer: Skin

The skin is the largest organ of the human body.

8. Which part of the plant absorbs water and minerals from the soil?

  1. Stem
  2. Leaf
  3. Flower
  4. Root

Answer: Root

Roots absorb water and minerals and anchor the plant in the soil.

9. Which vitamin is mainly produced in the skin with the help of sunlight?

  1. Vitamin A
  2. Vitamin B12
  3. Vitamin C
  4. Vitamin D

Answer: Vitamin D

Sunlight helps the skin produce Vitamin D.

10. Which blood group is known as the universal donor?

  1. A
  2. B
  3. AB
  4. O Negative

Answer: O Negative

O negative blood can be donated to people of all blood groups in emergencies.

11. Which organ controls the activities of the human body?

  1. Heart
  2. Brain
  3. Liver
  4. Kidney

Answer: Brain

The brain is the control center of the human nervous system.

12. Which process do plants use to make their own food?

  1. Respiration
  2. Digestion
  3. Photosynthesis
  4. Transpiration

Answer: Photosynthesis

Plants use sunlight, water, and carbon dioxide to make food through photosynthesis.

13. How many chambers does a human heart have?

  1. 2
  2. 3
  3. 4
  4. 5

Answer: 4

The human heart has four chambers: two atria and two ventricles.

14. Which molecule carries genetic information?

  1. Protein
  2. DNA
  3. Glucose
  4. Starch

Answer: DNA

DNA stores and transmits genetic information in living organisms.

15. Which organ is responsible for breathing?

  1. Kidney
  2. Liver
  3. Lungs
  4. Stomach

Answer: Lungs

The lungs exchange oxygen and carbon dioxide during breathing.

16. Which blood cells carry oxygen throughout the body?

  1. White Blood Cells
  2. Red Blood Cells
  3. Platelets
  4. Plasma

Answer: Red Blood Cells

Red blood cells contain hemoglobin, which transports oxygen.

17. Which organ produces insulin in the human body?

  1. Liver
  2. Pancreas
  3. Kidney
  4. Stomach

Answer: Pancreas

The pancreas produces insulin to regulate blood sugar levels.

18. What is the largest bone in the human body?

  1. Tibia
  2. Femur
  3. Humerus
  4. Radius

Answer: Femur

The femur (thigh bone) is the longest and strongest bone in the human body.

19. Which organelle is known as the powerhouse of the cell?

  1. Nucleus
  2. Ribosome
  3. Mitochondria
  4. Golgi Apparatus

Answer: Mitochondria

Mitochondria produce ATP, the main energy source for the cell.

20. Which kingdom do humans belong to?

  1. Plantae
  2. Fungi
  3. Protista
  4. Animalia

Answer: Animalia

Humans are multicellular organisms that belong to the Animal Kingdom.

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