Biology 2601A/B Lecture Notes - Lecture 10: Aerenchyma, Vacuole, Tracheid
6 Mar 2018
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Metabolism and photosynthesis are dependent on co2 and o2 exchange with the environment. Cross section of a leaf: cuticle - very top, waxy substance (relatively impermeable, main purpose is minimize water loss from the leaf surface. If you want to increase diffusion you need to. Increase the area available (more stomata or open really wide: more co2 to come in but more water to be lost, also dependant on the concentration gradient. If the air outside is really dry, the plant will lose a lot of water. If its really foggy out and the air is really saturated with water the plant will lose less water. Stomata are dynamic, can open and close depending on the conditions outside: open is, good for co2 uptake (photosynthesis, bad for water loss. Structure of stomata: 2 guard cells on either side of the pore, all the cells in the middle are the epidermal cells. Structure of stomata: more up close, 2 guard cells.
