A. - Sign 2. Choose a word from the box at the bottom of the page to fill in the gaps in the
sentences below. You can use words once, twice or not at all.
In animals, oxygen
into cells across cell membranes to be used in
Carbon dioxide
out of cells.
In plants, carbon dioxide diffuses into cells to be used in
Water enters the roots of plants by
Water moves into cells through
permeable membranes, which allow small molecules, such as water, to
pass through, but not large molecules.
Plants use a process called
to move minerals such as nitrates into
root cells. This requires
diffuses
photosynthesis
osmosis
active
transport
energy
partially
respiration
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