Your body is made of organs that work together in systems. Each system has a job that keeps you alive.
The digestive system breaks down food. The circulatory system (heart and blood vessels) carries blood around the body. The respiratory system (lungs) takes in oxygen. The skeletal system supports and protects the body.
An organ is a part with a special job, such as the heart or stomach. Organs working together make a system. Systems work together too: the lungs put oxygen in the blood and the heart pumps it to every part.
Which organ pumps blood around the body?
The lungs are part of the:
Which system breaks down food?
What does the skeletal system do?
An organ is:
When you run, your heart beats faster because:
A resting heart beats about 70 times in one minute.
About how many beats in 2 minutes?
Enter an exact answer, without rounding.Which system includes the heart and blood vessels?
Which gas do we breathe in that the body needs?
Where does most digestion take place?
Which protects the brain?
Which pair of organs works together to supply oxygen?
Living things depend on each other and on their surroundings. Together they form an ecosystem.
An ecosystem is all the living things in a place and the non-living things around them, such as soil, water and sunlight. A pond, a forest and a desert are all ecosystems. The place a living thing lives in is its habitat.
A food chain shows who eats whom. It starts with a producer (a plant that makes its own food using sunlight). Consumers eat other living things. Arrows point to what receives the energy.
An ecosystem is:
In a food chain, the producer is usually a:
A herbivore eats:
Which animal is a carnivore?
In grass → rabbit → fox, the arrow from grass to rabbit means:
A habitat is:
A food chain is: grass → grasshopper → frog → snake → eagle.
How many living things are in the chain?
Enter an exact answer, without rounding.Which is a producer?
What is the first living thing in a food chain?
An animal that eats plants and animals is an:
What do plants need to make food?
If all the rabbits disappear, what may happen to foxes?
Everything around us is matter. Matter usually exists as a solid, a liquid or a gas.
A solid keeps its shape. A liquid takes the shape of its container but has a fixed volume. A gas spreads out to fill any container.
All matter is made of tiny particles. In a solid they are packed tightly and only vibrate. In a liquid they are close but can slide past each other. In a gas they are far apart and move freely.
Which of these is a solid?
A liquid:
Which state of matter spreads out to fill its container?
In a solid the particles are:
Which can be squashed easily?
Steam is the gas form of:
A cup holds 250 millilitres of water. Water is a liquid, so its volume stays the same when poured into a bowl.
How many millilitres are in the bowl?
Enter an exact answer, without rounding.Which state keeps its own shape?
Which is a gas at room temperature?
The particles in a gas are:
Which is a liquid?
Which can flow but cannot be squashed easily?
Water changes state again and again. This movement of water between sea, air and land is the water cycle.
When a liquid warms up it can evaporate into a gas. When a gas cools it condenses into a liquid. When a liquid cools enough it freezes into a solid, and when a solid warms it melts.
The Sun heats seas and rivers and water evaporates. The water vapour rises, cools and condenses into clouds. Then it falls as precipitation (rain, snow or hail) and flows back to the sea.
Evaporation is when a liquid changes into a:
Condensation is when a gas changes into a:
Melting is when a solid changes into a:
What energy source drives the water cycle?
Rain, snow and hail are all called:
To test which place dries a wet cloth fastest, you should change:
A puddle loses 4 mm of water each hour in the sun.
How many millimetres does it lose in 3 hours?
Enter an exact answer, without rounding.In the water cycle, what happens straight after evaporation?
Clouds form when water vapour:
Which helps washing dry faster?
Freezing is when a liquid changes into a:
Where does most evaporation in the water cycle happen?
Magnets pull some materials without touching them. This invisible force is called magnetism.
Magnets attract magnetic materials such as iron, steel, nickel and cobalt. They do not attract wood, plastic, glass or copper. Every magnet has two poles, a north pole (N) and a south pole (S), where the force is strongest.
Unlike poles attract (N and S pull together). Like poles repel (N and N push apart). A compass contains a small magnet that points to the Earth’s north.
Which material is attracted to a magnet?
Which is NOT magnetic?
How many poles does a magnet have?
Two unlike poles will:
Two north poles will:
A compass needle is a small:
A tray has 12 objects. Exactly 5 of them are attracted to a magnet.
How many are NOT attracted?
Enter an exact answer, without rounding.Which pair of poles will push each other away?
Which is a magnetic material?
Where is a magnet’s force strongest?
A magnet can attract an object:
Which is NOT attracted to a magnet?
Electricity flows around a complete loop called a circuit. Some materials let it pass easily and others do not.
A circuit needs a cell or battery (the energy source), wires, and a component such as a bulb. The circuit must be a complete loop. A switch opens or closes the loop.
A conductor lets electricity flow through it. Metals such as copper and iron are conductors. An insulator does not, for example plastic, rubber, glass and wood.
For a bulb to light, the circuit must be:
A closed switch:
Which material is a good electrical conductor?
Which material is an insulator?
In a circuit the battery:
Which is safe for a classroom experiment?
A circuit has a battery, a switch, 2 bulbs and 4 wires.
How many parts are there in total, counting the wires?
Enter an exact answer, without rounding.Why does a bulb stay off when the switch is open?
Which is an insulator?
Wires are made of metal because metal is a good:
Which symbol idea is correct?
Which would NOT complete a circuit?
Questions from every topic in this course. Pick an answer for each one, then hit Check My Answers.
A group of organs working together is called a:
Which pair of organs works together to supply oxygen?
In the chain grass → rabbit → fox, the rabbit is a:
If all the rabbits disappear, what may happen to foxes?
Ice is a ___ and water is a ___.
Which can flow but cannot be squashed easily?
Which pair is in the right order?
Where does most evaporation in the water cycle happen?
Unlike magnetic poles:
Which is NOT attracted to a magnet?
To test whether a material is a conductor you place it in a circuit and see if the:
Which would NOT complete a circuit?