BIOL 1202 Lecture Notes - Lecture 5: Casparian Strip, Sieve Tube Element, Water Potential
Document Summary
Acquiring resources: adaptations for acquiring resources were key steps in the evolution of vascular plants, the broad category of nutrition includes all of the materials and energy needed for an organism to live and reproduce. Nutrients: nutrition in all organisms involves four main steps: Digestion, if required for a useable form of nutrients. Synthesis of molecules for the organism"s body: plants and animals acquire their nutrition differently. Required to break large molecules down to building blocks. Must acquire some through diet: plants acquire all their nutrients from soil (minerals), water (hydrogen and oxygen), or air (co2) First scale: transport of water (by osmosis) and solutes (by diffusion or active transport) by individual cells occurs via a transmembrane route. Very short distances across a membrane: plasma membrane controls movement of solutes into and out of the cell. Active transport: pay for the movement against concentration gradient. Water movement: concentration of solutes controls the movement of water.
