Transcript Turgor Pressure - Cloudfront.net

Turgor Pressure
 Turgor
Pressure is the main pressure of
the cell contents against the cell wall in
plant cells and bacteria cells, determined
by the water, resulting from osmotic
pressure.
Turgor Pressure
 Turgor
is a force exerted outward on a
plant cell wall by the water contained in
the cell.
Wilted plant cell

Plant cell filled
with water

How does Turgor
Pressure Work?
Osmosis
Osmosis: diffusion of
water through a
selectively permeable
membrane
Water moves from high to
low concentrations
•Water moves freely
through pores.
•Solute (green) to large
to move across.
Plant cells
So, plant cells have a thick cell wall surrounding the cell membrane.
Excellent.
Plant cells usually have a humongous water-filled
vacuole, called a central vacuole, that pushes out
on the cell membrane to keep the cell rigid and
tough. If the vacuole loses too much water, it will
cause the cell to become limp. If too many cells
suffer this fate, the entire plant will “wilt” and its
leaves will lose their shape and strength and
droop.