Biology water IB (A1.1)
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9 Terms
define water potential
a measure of the potential energy of water per unit volume relative to pure water
the more negative the solute potential…
the more solutes there are
the more negative the water potential…
the less energy there is and the higher the solute potential
when an animal cell is in a hypotonic substance…
it undergoes lysis (bursting)
when an animal cell is in a hypertonic substance…
it undergoes crenation
when a plant cell is plasmolysed what does it detach from and why
it detaches from the cell wall not the cell membrane because the membrane stays tightly wrapped around the shrinking cytoplasm instead of being stuck to the wall
positive pressure
the pressure inside a system (cell) is higher than the pressure outside (pushing against a surface)
negative pressure
the pressure inside a system (cell) is lower than the pressure outside (vacuum effect)
when ionic compounds dissolve in water what happens?
water molecules surround the ions of the compound and form a hydration ring