Osmosis (Leaving Cert Biology): Flashcards

Water movement from high to low water concentration across a semi-permeable membrane

No, it is a passive process

Water molecules only

Plant cell full of water, firm, under turgor pressure

Pressure of vacuole/cytoplasm against cell wall

Plant cell that lost water, membrane pulls from cell wall

Water enters by osmosis, cell becomes turgid

Water leaves by osmosis, cell becomes plasmolysed

Plant wilts

Water enters, cell expands and bursts (no cell wall)

Water leaves, cell shrinks and dehydrates

Same water concentration inside and outside cell; no net water movement

Lower water conc. than inside cell; water moves out

Higher water conc. than inside cell; water moves in

Removes water from microorganisms by osmosis, killing them