Exploring Changes, Transport, and Electricity

What is an example of a physical change?

• Melting ice into water

• Freezing water into ice

• Burning wood to ash

• Dissolving sugar in water

Which of the following is a chemical change?

• Ice melting into water

• Sugar dissolving in water

• Rust forming on iron

• Boiling water to steam

What process do plants use to transport water?

• Photosynthesis

• Osmosis

• Transpiration

• Evaporation

How do animals transport oxygen in their bodies?

• Animals use gills to absorb oxygen from the air.

• Oxygen is transported through the skin in all animals.

• Animals rely on their lungs to store oxygen without blood.

• Animals transport oxygen using hemoglobin in blood or through tracheal systems in insects.

What is a renewable source of electricity?

• Coal energy

• Natural gas

• Solar, wind, hydroelectric, geothermal, and biomass energy.

• Nuclear energy

What is the basic unit of an electric circuit?

• Resistor

• Circuit element

• Power source

• Capacitor

Which of the following is NOT a physical change?

• Melting of ice

• Dissolving sugar in water

• Boiling of water

• Rusting of iron

What happens during a chemical reaction?

• Chemical bonds are broken and formed, resulting in new substances.

• Chemical reactions do not involve energy changes.

• Chemical reactions only involve physical changes.

• New substances are created without any bond changes.

How do roots help in plant transportation?

• Roots help in plant transportation by absorbing water and nutrients from the soil and facilitating their movement through the plant.

• Roots primarily store energy for the plant.

• Roots are responsible for photosynthesis in plants.

• Roots only anchor the plant in the soil.

What is the role of the heart in animal transportation?

• The heart circulates blood to transport oxygen, nutrients, and waste products in animals.

• The heart produces hormones for digestion.

• The heart filters toxins from the bloodstream.

• The heart stores energy for muscle movement.