BIOL 115 Lecture Notes - Lecture 25: Osmoregulation, Stoma, Transpiration

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31 Aug 2020
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Movement: in the xylem tubes of the leaves (particularly amino acids, sugars and plant hormones) to all parts of the plants. Movement occurs in two directions, up towards the flower and down to the roots. properties of water. Chemical substances that are needed for photosynthesis are carried by xylem tissue from the roots up to the leaves where they will used for the manufacturer of food (photosynthesis). Xylem: transport of water is passive and depends on transpiration and the physical. Phloem: phloem vessels are involved in the transportation of organic nutrient products. Theories: xylem: the transpiration stream theory (cohesion-adhesion-tension theory) Transpiration evaporation of water from leaf cells through stomata. Cohesion water molecules tend to bind together, forming a continuous column. Adhesion water molecules stick to the sides of the xylem tubes. Phloem: the pressure flow theory (source-path-sink theory) Source sugars and other mineral nutrients are loaded" into the phloem sieve.

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