Plants and Seeds
What is the main difference between flowering and nonflowering plants?
Flowering plants produce flowers; nonflowering plants do not.
How are sounds made?
By vibrations.
What state of matter is air?
Gas
What is the job of the digestive system?
To break down food.
What force pulls objects toward Earth?
Gravity.
What is pollination?
The transfer of pollen from one flower to another.
What happens when you hit a drum harder?
The sound becomes louder.
Name the three states of water.
Solid, liquid, and gas.
Which organ chews and breaks food into smaller pieces first?
The mouth.
What force slows moving objects in air?
Air resistance.
Name one way seeds are spread.
Wind, animals, water, or explosion.
What does pitch describe in sound?
How high or low a sound is.
What is evaporation?
When liquid changes into gas.
Which organ stores and digests food using acids?
The stomach.
What force slows objects moving through water?
Water resistance.
Why are fruits important for plants?
They protect and help spread seeds.
What causes a high-pitched sound?
Faster vibrations.
What is condensation?
When gas changes into liquid.
What is a balanced diet?
Eating the right amounts of nutrients.
What happens when opposite magnetic poles meet?
They attract.
What three things are needed for seed germination?
Water, warmth, and air.
What happens to volume when vibrations become stronger?
The sound becomes louder.
What is a solution?
A mixture where one substance dissolves in another.
Why is the small intestine important?
It absorbs nutrients into the body.
Why do satellites stay in orbit around Earth?
Gravity keeps pulling them toward Earth.
Explain how animals help with seed dispersal.
Seeds stick to fur or are eaten and later dropped elsewhere.
Why does a guitar string make a higher pitch when tightened?
Tight strings vibrate faster.
Why does sugar disappear when mixed in water?
It dissolves to form a solution.
Why do humans need a balanced diet?
To stay healthy, grow, and have energy.
In tug-of-war, what happens if both teams pull equally hard?
The rope stays still because the forces are balanced.