Which organelle is known as the powerhouse of the cell?
Which gas do plants mainly use during photosynthesis?
Which force keeps planets in orbit around the Sun?
Which organ pumps blood throughout the human body?
What is the process by which liquid water changes into water vapour?
Which is the outermost solid layer of Earth?
Which vitamin can the human body produce when the skin is exposed to sunlight?
A ramp is an example of which simple machine?
Which blood cells help the body fight infections?
What is the main source of energy for most ecosystems on Earth?
Which instrument is used to measure temperature?
Which planet is closest to the Sun?
Which process breaks food into simpler substances that the body can absorb?
What usually happens to most materials when they are heated?
Which part of a plant absorbs most water and minerals from the soil?
What type of energy is stored in a stretched rubber band?
Which gas is most abundant in Earth's atmosphere?
What type of rock forms when molten rock cools and solidifies?
What causes day and night on Earth?
Which planet is known for its prominent ring system?
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