Transport in Angiosperms

Topic 9.2

9.2.1 - 9.2.4: Root systems - mineral ion and water uptake

Root systems provide a large surface area for mineral ion and water uptake from the soil. Mineral ions and water can be found tightly bound to clay particles in the soil. The large surface area of the root system via lateral and branching roots provides for efficient uptake of the ions in water from the soil. mineral ions move through the soil to the roots by diffusion, fungal hyphae (known as mutualism), and mass flow water which carries the mineral ions. Roots also allow terrestrial plants to support themselves by means of thickened cellulose in cell walls, cell turgor, and liquefied xylem.

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9.2.5 - 9.2.8 & 9.2.11: Transpiration and Translocation

Transpiration is the loss of water from the leaves and stems of the plant. Water is carried through the plant by the transpiration stream. Guard cells can regulate transpiration by the opening and closing of stomata where the plant hormone abscisic acid causes the closing of stomata. Translocation is the active transport of sugars (sucrose) and amino acids from photosynthetic tissue and storage organs (source) to fruits, seeds, and roots (sink).

translocation link translocation animation
Translocation
transpiration link transpiration animation

9.2.9: Abiotic factors affecting transpiration

Figure 3 below explains how the abiotic factors light, temperature, wind, and humidity affect the rate of transpiration in a typical terrestrial plant.

9.2.10: Adaptations of xerophytes

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