Slides in this set
Diffusion is when something travels from an area of high
concentration to an area of low concentration. For example,
consider the scent from a hamburger...
The "scent particles" from
this hamburger are in high
Eventually they will
"diffuse" out into this area
of low concentration:…read more
Osmosis is a "special kind of diffusion". It's when water diffuses from a
concentrated area to a less concentrated area through a partially
permeable membrane (i.e. one that allows water to move through but not
Water Sugar solution
In this example the water
molecules will move from left to
right (along the concentration
gradient) and gradually dilute
the sugar solution.
This is how water moves into
root hair cells…read more
Active Transport 14
Active transport is when substances are absorbed _______ a
concentration gradient (like a ball being rolled ___ a hill). This
takes place in the opposite direction to normal _______. This
is how nitrates are taken in by root hair cells:
Root hair cell Root hair
already has a large cells "pull"
concentration of more nitrate
nitrate ions ions in
This process needs ________ (just like rolling a ball up a hill
would). This energy is provided by __________.
Words energy, up, respiration, diffusion, against…read more