Explain the process that occurs when a stoma goes from closed to open
What will be an ideal response?
When triggered by items such as blue light or a decrease in carbon dioxide concentration, guard cells
will undergo activity changes that will change them from flaccid to turgid. Turgid guard cells bend
away from each other, opening the space between them (the stoma). The process that leads guard cells
to become turgid is as follows. First, protons are pumped out of the guard cells by active transport.
Then, protons flow back into the cells, providing energy for active transport of K+ into the cells. This
increases the solute concentration inside the cells, so water then follows into the cells by osmosis. The
movement of water into the cells causes turgor pressure to build until the guard cells become turgid,
thus opening the stoma.
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