BIOL10001 Lecture 6: BIOL10001 Lecture 6&7 Notes
20 Sep 2018
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Xerophytes: drought tolerating plants, with physical or physiological adaptions that maximise water uptake, minimise water loss and maximise water use e ciency. Grow and reproduce quickly when moisture is available. River red gum with deep root system to access ground water. Plants avoid dehydration by either increasing water absorption, reducing water loss by. Increased aridity, increased re frequency and weathering of soils during the last 30 million. Xerophytes years favoured evolution and dominance transpiration, or both the sun"s rays, thereby reducing the sun"s heating e ect and consequently transpiration from leaves. Control of water loss is closely related to control of leaf temperature. Unstressed leaves face the sun through the day; water-stressed leaves orientate parallel to. Tough rigid leaves that do not wilt when water is stressed. Possess features that allow them to survive in low soil nutrients, water stress, heat and re. Secondary cell wall gets progressively thicker as the cell approaches maturity.
