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Plant Nutrition - Video for Xylem Flow 36__A.swf...

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Video for Xylem Flow: Video for Phloem Flow: 36_13XylemTranspiration_A.swf 36_19PhloemTranslocSummer_A.swf 36_19PhloemTranslocSpring_A.swf 36_12XylemTransport_A.swf
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Plant Nutrition v Plants require certain chemical elements to complete their life cycle Ø Plants derive most of their organic mass from the CO2 of air Figure 37.2 CO2, the source of carbon for Photosynthesis, diffuses into leaves from the air through stomata. Through stomata, leaves expel H2O and O2. H2 O O 2 CO 2 Roots take in O2 and expel CO2. The plant uses O2 for cellular respiration but is a net O2 producer. O 2 CO 2 H2 O Roots absorb H2O and minerals from the soil. Minerals Ø But they also depend on soil nutrients such as water and minerals 17 elements are essential
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Essential Elements required in Plants Can be subdivided into Macro- and Micro- nutrients 9 Macronutrients : Greater quantities needed for anabolism (root uptake) (ai r) 8 Micronutrients : Lesser quantities needed as cofactors for catalysis
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Water Uptake Figure 37.6a (a) Soil water.
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