Cell Parts
What part of the plant cell holds water?
vacuole
What moves during osmosis?
What kind of cells did we observe?
onion cells
What if the onion cell had no membrane? Would osmosis happen?
No — the membrane controls water movement.
What part gives the plant cell its shape?
Does water move from more to less or less to more concentration
more to less
What happened to cells in salt water?
They shrank / cytoplasm pulled away
What if you put the onion cells in sugar water?
Same as salt — water would move out
Which part controls what goes in and out of the cell?
cell membrane
What kind of membrane does osmosis need?
semi-permeable membrane
What happened to cells in plain water?
They stayed full / didn’t change much.
What if a plant lived in salty soil?
It would lose water and wilt.
What is the jelly-like substance that fills the inside of a cell?
cytoplasm
What is it called when water moves into a cell?
hypotonic osmosis or swelling
Why didn’t the cell wall shrink with the rest of the cell?
It’s rigid and doesn’t allow shape change
What if you soaked a gummy bear in water overnight?
It would swell up from water entering.
What part of the cell shrinks when water leaves during osmosis?
cytoplasm or vacuole
What is it called when water moves out of a cell?
hypertonic osmosis or plasmolysis
What is it called when the cell membrane pulls away from the cell wall?
plasmolysis
What if the cell was in an isotonic solution?
Nothing would change — water is balanced.