cell movement Flashcards
what is diffusion
the movement of substances from a region of high conc to low, does not require energy, passive process
what is an example of diffusion
gaseous exchange
what is the solute
the substance that dissolves in a solvent eg salt
what is the solvent
the substance that does the dissolving of the solute eg water
what is osmosis
the movement of water across a semi permeable membrane from high conc to low, no energy required
what is an isotonic solution
the solution is the same concentration as the cytoplasm, water will move in and out of the cell membrane but the concentrations will remain the same
what is a hypertonic solution
when there is more water outside than inside so water moves into the cell by osmosis, this causes the cell to burst and die
what is a hypotonic solution
when there is more water inside the cell so water moves out into the solution causing the cell to shrivel up and die.
are plant cell walls permeable or non permeable
fully permeable
what happens to plant cells when they are in a less concentrated solution than their cytoplasm
water moves into the cytoplasm and vacuole causing swelling in then cytoplasm and vacuole which puts pressure on the cell wall, .
what is turgor pressure and what does it prevent
the force of the cell membrane and cytoplasm pushing against the cell wall due to being swollen with water, it prevents the cell from bursting
what happens to plant cells when they are in a more concentrated solution than their cytoplasm
water moves out of the cytoplasm and vacuole causing it to shrink and the cell membrane to pull away from the cell wall. the solution outside moves into the space between the cell wall and membrane
what is plasmolysis
when water fills in the space between the cell wall and membrane when placed in a more concentrated solution causing plants to wilt
what is deplasmolysis
the reverse of plasmolysis when plants are placed in a less concentrated solution after being wilted from plasmolysis
