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General science
Powerhouse of the cell
Answer: Mitochondria
Number of bones in an adult human
Answer: 206
Smallest bone in the human body
Answer: Stapes (ear)
Largest gland in the human body
Answer: Liver
Life span of red blood cells
Answer: About 120 days
Universal blood donor group
Answer: O negative
Deficiency of vitamin C causes
Answer: Scurvy
Deficiency of vitamin D causes
Answer: Rickets
Deficiency of vitamin A causes
Answer: Night blindness
Vitamin needed for blood clotting
Answer: Vitamin K
Hormone that controls blood sugar
Answer: Insulin
Metal in chlorophyll
Answer: Magnesium
Metal in haemoglobin
Answer: Iron
Most abundant gas in air
Answer: Nitrogen (78%)
Laughing gas
Answer: Nitrous oxide (N₂O)
Hardest natural substance
Answer: Diamond
Brass is an alloy of
Answer: Copper and zinc
Bronze is an alloy of
Answer: Copper and tin
Speed of light in vacuum
Answer: 3 × 10⁸ m/s
SI unit of force
Answer: Newton
SI unit of electric current
Answer: Ampere
Layer that blocks ultraviolet rays
Answer: Ozone layer
Father of genetics
Answer: Gregor Mendel
Discoverer of penicillin
Answer: Alexander Fleming
Inventor of the telephone
Answer: Alexander Graham Bell
Largest organ of the human body
Answer: Skin
Vitamin made in the skin by sunlight
Answer: Vitamin D
Organ that produces insulin
Answer: Pancreas
Organ that filters blood to form urine
Answer: Kidney
Normal human body temperature
Answer: About 37 °C
pH of pure water at 25 °C
Answer: 7
Lightest gas
Answer: Hydrogen
Chemical formula of common salt
Answer: NaCl
SI unit of electrical resistance
Answer: Ohm
SI unit of power
Answer: Watt