3.1 - Diffusion Flashcards
Define diffusion.
The random movement of particles from a region of higher concentration to a region of lower concentration.
Define kinetic energy.
The energy that moves objects consists of.
Define net movement.
Average movement of particles.
Define concentration gradient.
A slope that shows the movement of particles from a region of High concentration to a region of High concentration.
Define partially permeable membrane.
It only allows some molecules to cross easily.
What restricts the free movement of molecules?
Cell membrane.
What does diffusion help living organisms with?
- Obtain many of their requirements.
- Get rid of many of their waste products.
- carry outgas exchange for respiration.
Where does the energy for diffusion come from?
- All particles move randomly at all times.
- This is known as Brownian motion.
- The energy for diffusion comes from the kinetic energy of this random movement of molecules & ions.
What factors influence diffusion?
- Surface area to volume ratio
- Distance
- Temperature
- Concentration Gradeient
Define independent variable.
The variable that you change.
Define dependent variable
The variable that you measure.
How are plant cells in pure water?
Do not burst.
Where does osmosis take place in plant cells?
Water diffuses into the cytoplasm and vacuoles through the partially permeable cell membrane.
Which part of the cell membrane is partially permeable?
Cell membrane
What happens to the vacuole and cytoplasm when water goes in?
It swells because of turgor pressure.
