BIOL 1001March 1

BIOL 1001March 1 - outer wall balloons outward causing the...

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BIOL 1001 March 1, 2010 CHAPTER 7: Photosynthesis What is Photosynthesis? Process that uses light to synthesize Photosynthesis CO 2 +H 2 O C 6 H 12 O 6 + O 2 (glucose) Energy is supplied Glucose- polysaccharide cellulose What organisms perform photosynthesis? Plants Bacteria Protists Photosynthesis and Respiration (Fig. 7-1) Stomata: Microscopic openings in the epidermis of leaves that allow the exchange of gases between the outside air and the inside of the leaf When open gases can move in and out Water cannot leave when stomata is closed Oxygen is bad thing for photosynthetic organism Opens and closes in response to the internal pressure of two sausage shaped guard cells that surround it When the guard cell is filled with water it becomes turgid, the
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Unformatted text preview: outer wall balloons outward, causing the stomata to open • Opening: water enters, cells swell, stoma opens. • Closing: water leaves, cell shrink, stoma closes. Factors that control stomata opening and closing: 1. Carbon dioxide concentration-When concentration in the leaf falls the guard cells become turgid and the stomata open 2. Humidity a. Stomates close on hot, dry, windy days b. At dawn a sudden increase in stomatal opening, reaching maximum near noon, is followed by a decline because of water loss How do stomata open? • Active transport AND osmosis: Chloroplast Structure ( fig. 7-2c) • Has own circular genome • Inner and outer membrane; Stroma; Thylakoids; granum • Thylakoids are hollow...
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