1. What is the chemical symbol for water? Solution: The chemical symbol for water is H₂O. It consists of two hydrogen atoms and one oxygen atom.
2. How many planets are in our solar system? Solution: There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
3. What is the process by which plants make their own food? Solution: The process by which plants make their own food is called photosynthesis.
4. What is the powerhouse of the cell? Solution: The mitochondrion is known as the powerhouse of the cell because it produces energy in the form of ATP.
5. What is the chemical formula for table salt? Solution: The chemical formula for table salt is NaCl (sodium chloride).
6. What do you call a group of stars that forms a pattern in the sky? Solution: A group of stars that forms a pattern in the sky is called a constellation.
7. What is the smallest unit of life? Solution: The smallest unit of life is the cell.
8. What planet is known as the Red Planet? Solution: Mars is known as the Red Planet due to its reddish appearance, which is caused by iron oxide (rust) on its surface.
9. What is the force that keeps us on the ground? Solution: The force that keeps us on the ground is gravity. It is the force of attraction between two bodies with mass.
10. What is the boiling point of water at sea level? Solution: The boiling point of water at sea level is 100°C (212°F).
11. What gas do plants absorb from the atmosphere during photosynthesis? Solution: Plants absorb carbon dioxide (CO₂) from the atmosphere during photosynthesis.
12. What is the largest organ in the human body? Solution: The largest organ in the human body is the skin.
13. What is the speed of light? Solution: The speed of light in a vacuum is approximately 299,792,458 meters per second (about 300,000 km/s).
14. Which part of the cell contains the genetic material? Solution: The nucleus of a cell contains the genetic material (DNA).
15. What is the most abundant gas in Earth’s atmosphere? Solution: The most abundant gas in Earth’s atmosphere is nitrogen, making up about 78%.
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