Cells & Living Things
What controls what happens in a cell?
the nucleus
Which body system helps you breathe?
respiratory system
What are the layers of Earth?
crust, mantle, outer core, inner core
Name one form of energy.
light, heat, sound, electrical
(only need to provide one answer to be correct)
What is a variable?
something that changes in an experiment
Name one difference between plant and animal cells.
Plants have chloroplasts and cell walls, but animals do not.
(Only need to state chloroplasts or cell walls to be correct.)
Which body system pumps blood?
circulatory system
What causes day and night?
Earth's rotation
What is an example of energy transfer?
heat moving from hot cocoa to hands
(answers could vary)
What is the control group?
the comparison group; the group where no variables have been adjusted/changed
What is the job of mitochondria?
to release energy for the cell
How do the digestive and circulatory systems work together?
nutrients are absorbed and transported
What causes seasons?
Earth's tilt and orbit around the Sun
Is melting a physical or chemical change?
physical change
What is a hypothesis?
a testable prediction
Predict what happens if a cell membrane stops working.
materials could not move in or out correctly
Why does your breathing increase during exercise?
more oxygen is needed
Patterns in temperature, pressure, and wind help predict storms.
What evidence suggests a chemical change?
color change, gas, temperature change
(only need to provide one answer to be correct)
Why do scientists collect data?
to support conclusions
A cell has no mitochondria. What happened?
The cell would struggle to get energy.
Explain how the muscular system and respiratory system work together during sports.
During sports, body systems work together continuously to help you move and perform activities. For example, the muscular system and the respiratory system work closely together.
When you run, jump, or play a sport, your muscles need oxygen to produce energy. The respiratory system brings oxygen into your lungs when you breathe. That oxygen moves into your blood and is delivered to your muscles so they can keep working. As your muscles work harder, you breathe faster because your body needs more oxygen and must remove more carbon dioxide.
For example, during a basketball game, leg muscles help you run and jump, while your lungs increase breathing to provide the oxygen those muscles need. Working together allows your body to move efficiently and keep playing.
Predict how Earth would change without a Moon.
changes to tides and systems
Why does ice melt faster on a warm sidewalk than on grass?
The sidewalk absorbs and transfers more heat.
A student tests plant growth with different amounts of sunlight. What are the variables?
independent: sunlight
dependent: plant growth