BIOL 2Q04 Lecture Notes - Lecture 3: Drought Tolerance, Plantago, North South Mrt Line
2 Dec 2015
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Document Summary
Temperature and moisture are most important abiotic factors. Summer solstice: solar radiation falls directly on the tropic of cancer, with increased input and day length in the northern hemisphere. Vernal and autumnal equinoxes: solar radiation falls directly on the equator. Winter solstice: solar radiation falls directly on the tropic of capricorn, with increased input and day length in the southern hemisphere. Most sensitive phase of life cycle to temperature and moisture. Physiological tolerance of this phase of the life cycle (acclimation- gradual change) Show that the temperature or moisture range in the microclimate where the individual lives is within the range of tolerance limits. Increase water uptake by roots: decrease water loss by stomata, decrease respiration, store ware in tissues (example cactus) Treeline: example cassava (africa, asia, latin america) rapid stomatal closure, deep roots i. Nine factors affecting distribution of trees o o o o o o o o. Ecotype: local adaptations to local conditions (genetic varieties of the same.
