BIOLOGY PART 4

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Biology 12 McQ

Here are *12 Biology Multiple Choice Questions (MCQs)** along with their answers:



36. **What is the smallest unit of life?**

    - A) Cell

    - B) Tissue

    - C) Organ

    - D) Organism

    - **Answer: A) Cell**


37. **Which disease is caused by the deficiency of vitamin C?**

    - A) Scurvy

    - B) Rickets

    - C) Beriberi

    - D) Pellagra

    - **Answer: A) Scurvy**


38. **Which gas is responsible for the greenhouse effect on Earth?**

    - A) Oxygen

    - B) Nitrogen

    - C) Carbon dioxide

    - D) Hydrogen

    - **Answer: C) Carbon dioxide**



39. **Which blood vessel carries oxygenated blood from the lungs to the heart?**

    - A) Vein

    - B) Artery

    - C) Capillary

    - D) Pulmonary vein

    - **Answer: D) Pulmonary vein**


40. **Which part of the plant is responsible for photosynthesis?**

    - A) Roots

    - B) Leaves

    - C) Stem

    - D) Flowers

    - **Answer: B) Leaves**


41. **What is the main function of white blood cells (WBCs)?**

    - A) Transport oxygen

    - B) Fight infections

    - C) Clot blood

    - D) Carry nutrients

    - **Answer: B) Fight infections**


42. **Which organelle is responsible for protein synthesis in a cell?**

    - A) Nucleus

    - B) Mitochondria

    - C) Endoplasmic reticulum

    - D) Golgi apparatus

    - **Answer: C) Endoplasmic reticulum**


43. **Which gas is released during photosynthesis?**

    - A) Oxygen

    - B) Carbon dioxide

    - C) Nitrogen

    - D) Hydrogen

    - **Answer: A) Oxygen**



44. **Which disease is caused by the Plasmodium parasite transmitted by mosquitoes?**

    - A) Dengue

    - B) Malaria

    - C) Typhoid

    - D) Chikungunya

    - **Answer: B) Malaria**


45. **What is the function of the ribosomes in a cell?**

    - A) Energy production

    - B) Protein synthesis

    - C) Cell division

    - D) Storage of genetic material

    - **Answer: B) Protein synthesis**


46. **Which gas is essential for respiration in humans?**

    - A) Oxygen

    - B) Carbon dioxide

    - C) Nitrogen

    - D) Helium

    - **Answer: A) Oxygen**


47. **Which vitamin is essential for blood clotting?**

    - A) Vitamin A

    - B) Vitamin K

    - C) Vitamin C

    - D) Vitamin E

    - **Answer: B) Vitamin K**

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