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30 medium science questions including atoms, cells, and the universe.
1. What is the protein that carries oxygen in red blood cells?
💡 Hemoglobin is an iron-containing protein that binds oxygen in the lungs and carries it throughout the body.
2. Which scientist proposed the heliocentric model of the solar system?
💡 Nicolaus Copernicus proposed in 1543 that the Sun not the Earth was the center of the solar system.
3. What scientist discovered penicillin?
💡 Alexander Fleming discovered penicillin in 1928 when he noticed mold killing bacteria in his petri dish.
4. What is the scale used to measure earthquake magnitude?
💡 The Richter Scale was developed by Charles Richter in 1935. Each whole number increase represents 10x more shaking.
5. What type of rock is formed from cooled lava or magma?
💡 Igneous rocks form when magma cools and solidifies. Granite forms underground while basalt forms at the surface.
6. Which planet has the longest day in our solar system?
💡 A day on Venus lasts 243 Earth days — longer than its year of 225 Earth days.
7. Which blood type is the universal recipient?
💡 AB positive is the universal recipient — people with this blood type can receive blood from any other blood type.
8. What is the name of the process by which plants lose water through their leaves?
💡 Transpiration is the process where plants release water vapor through tiny pores called stomata.
9. How many chromosomes does a normal human cell contain?
💡 Human cells contain 46 chromosomes in 23 pairs. One chromosome in each pair comes from each parent.
10. What is the unit of electrical resistance?
💡 The ohm is the unit of electrical resistance. Ohm's Law states voltage equals current multiplied by resistance.