BIOL 1201 Midterm: Exam 3
8 Dec 2015
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Co2 + h2o + energy -> c6h12o6 +o2. Plants, bacteria, protists (algae: about 70% of photosynthesis occurs in the aquatic environment. Stoma (pores) are extremely important in controlling. Co2/h2o in the leaf: has two guard cells are either open or closed. If there is no pressure, the cell becomes flaccid and closes. Opening: water enters, cells swell, stoma opens. Closing: water leaves, cells shrink, stoma closes: factors that control stomata opening and closing. When concentration in the leaf falls the guard cells become turgid and the stomata opens. Stomata close on hot, dry, windy days. At dawn a sudden increase in stomata opening, reaching maximum near noon, is followed by a decline because of water loss. For the stomata to close, water must leave the turgid guard cells. Ions (such as k and cl) are actively taken out of guard cells, and the water follows it by osmosis. Turgid cells go limp and close the stomata.
