Science Flashcards
7 cards from real ICAS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Science flashcards as text
A student leaves a damp cloth on a windowsill in sunlight. After an hour, the cloth is dry. Which process best explains this?
Answer: Evaporation
Evaporation occurs when liquid water absorbs heat energy and changes into water vapor, drying the cloth.
Which organ system is primarily responsible for removing carbon dioxide from the human body?
Answer: Respiratory system
The respiratory system expels carbon dioxide from the body when we exhale through the lungs.
A magnet is brought near a pile of mixed sand and iron filings. What will happen?
Answer: Only the iron filings are attracted
Magnets attract ferromagnetic materials like iron, but have no effect on non-magnetic materials like sand.
Plants appear green because their leaves mainly:
Answer: Reflect green light and absorb other wavelengths
Chlorophyll in plant leaves absorbs red and blue light for photosynthesis and reflects green light, making plants appear green.
Which of the following is a chemical change rather than a physical change?
Answer: Wood burning in a fire
Burning wood is a chemical change because it produces new substances (ash, carbon dioxide, and water vapor) that cannot easily be reversed.
The Moon appears to change shape over the course of a month. This is because:
Answer: We see different portions of the Moon's lit side as it orbits Earth
As the Moon orbits Earth, we see different fractions of its sunlit half, creating the appearance of changing phases.
A bird has hollow bones. How does this adaptation most likely help the bird?
Answer: It reduces the bird's body weight to aid in flight
Hollow bones reduce overall body mass, making it easier for birds to achieve and sustain flight.