Water Systems
What is the continuous movement of water between Earth's surface and the atmosphere called?
The Water Cycle
What are the two states of matter that are considered fluids?
Liquid and gas
What is a system?
A group of connected parts that work together to perform a function.
What is the basic unit of life?
Cells
I help you breathe by bringing oxygen into your body and removing carbon dioxide. Which system am I?
The respiratory system.
What process occurs when liquid water changes into water vapour?
Evaporation.
which one is not in the water cycle?
Condensation, evaporation, accumulation, OR aeration
aeration
Name two simple machines.
options: Lever, pulley, wheel and axle, inclined plane, screw, or wedge.
Which cell structure controls the activities of the cell?
The nucleus.
I break down food into nutrients that your body can use for energy, growth, and repair. Which system am I?
The digestive system.
What am i? An area of land where all water drains into the same river, lake, or body of water.
a watershed
Why does a boat float on water?
The buoyant force pushing up is equal to or greater than the force of gravity pulling down.
What is the difference between a hydraulic and pneumatic system?
Pneumatics and hydraulics both use fluid power, but pneumatics uses compressed air or gas, while hydraulics uses pressurized liquids
What structure is found in plant cells but not animal cells and is responsible for photosynthesis?
Chloroplasts.
I transport oxygen, nutrients, and waste materials throughout the body using blood vessels and the heart. Which system am I?
The circulatory (cardiovascular) system.
Name one human activity that can negatively affect water quality.
Examples: dumping waste, agricultural runoff, industrial pollution, oil spills, excessive use of fertilizers or pesticides.
What property of a fluid describes its resistance to flowing?
Viscosity
what is friction? How can friction affect the efficiency of a mechanical system?
Friction reduces efficiency because some of the input energy is converted into heat instead of being used to do useful work.
What is the function of the cell membrane?
It controls what enters and leaves the cell.
I include the brain, spinal cord, and nerves. I receive information from the environment and coordinate the body's responses. Which system am I?
The nervous system.
Explain how wetlands help maintain healthy water systems.
Wetlands filter pollutants, reduce flooding, provide habitats for organisms, and help recharge groundwater supplies.
Two objects have the same volume, but one sinks and one floats. What property is most likely different between them?
Answer: Density.
A pulley system allows a worker to lift a 200 N load using only 50 N of effort force. What is the mechanical advantage of the pulley system?
Mechanical Advantage = Load Force ÷ Effort Force = 200 N ÷ 50 N = 4. The mechanical advantage is 4.
A student observes a cell that contains a cell membrane, cytoplasm, chloroplasts, and a cell wall. What type of cell is it, and how do you know?
It is a plant cell because chloroplasts and a cell wall are structures found in plant cells but not animal cells.
During a soccer game, your muscles contract to move your legs, your lungs take in more oxygen, and your heart pumps faster to deliver that oxygen to your muscles. Which three body systems are working together?
The muscular system, respiratory system, and circulatory (cardiovascular) system.