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biology 0610printed 43 · PDF 43
328 pagesrevision 46933
printed 43 · PDF 43
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plant cells have too little water after osmosis takes place then cells will become
flaccid.
Active transport
Net movement of particles from an area of low concentration gradient to an area of
high concentration gradient.
Up the concentration gradient
Requires energy(ATP) to carry out the process
Energy is required because the particles have to move against the gradient.
Living partially permeable membrane is required
There are special proteins in cell membranes known as “special carrier proteins” that
help to carry out the process. These proteins often have specific shapes to allow them
to carry out this process
Through active transport, plants take in nitrate ions from the soil which are necessary
for the plant