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15 science trivia questions and answers online spanning astronomy, chemistry, biology and Earth science.
1. Which planet has the shortest orbital period, or 'year', in the solar system?
💡 Mercury completes an orbit around the sun in just about 88 Earth days, the shortest of any planet.
2. What is the term for different forms of the same element with different numbers of neutrons?
💡 Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
3. What is the cloud of gas and dust from which stars are formed called?
💡 A nebula is a giant cloud of gas and dust in space, often the birthplace of new stars.
4. Which chemical element is essential for building strong bones and teeth?
💡 Calcium is a key mineral that gives bones and teeth their strength and structure.
5. What term describes a chemical reaction that releases energy, usually as heat?
💡 Exothermic reactions release energy to their surroundings, often in the form of heat or light.
6. What is the name of the boundary layer between the Earth's crust and mantle called?
💡 The Moho Discontinuity marks the boundary between the Earth's crust and the underlying mantle.
7. Which planet is often referred to as Earth's 'sister planet' due to its similar size?
💡 Venus is close to Earth in size and mass, earning it the nickname 'Earth's sister planet', despite very different conditions.
8. What is the term for two or more atoms chemically bonded together?
💡 A molecule forms when two or more atoms are held together by chemical bonds.
9. Which gas is used by plants during photosynthesis and released during respiration?
💡 Carbon dioxide is absorbed by plants for photosynthesis and released by all organisms during respiration.
10. What is the process by which the body breaks down food using enzymes called?
💡 Digestion involves enzymes breaking down food into smaller molecules the body can absorb and use.
11. What is the name of the process where an organism maintains stable internal conditions called?
💡 Homeostasis is the process by which organisms regulate their internal environment, such as temperature and pH, to remain stable.
12. Which organ is primarily responsible for filtering toxins from the blood in the human body?
💡 The liver filters toxins from the blood and processes nutrients absorbed from digestion.
13. Which type of electromagnetic wave has the shortest wavelength?
💡 Gamma rays have the shortest wavelength and highest energy of all electromagnetic waves.
14. What is the term for an organism's observable physical characteristics?
💡 Phenotype refers to the observable traits of an organism, resulting from both genetics and environment.
15. Which scientist is credited with discovering the laws of inheritance through pea plant experiments?
💡 Gregor Mendel's experiments with pea plants in the 1860s laid the foundation for modern genetics.