BIOL 1202 Chapter : Chapter 36
Document Summary
Concept 36. 1- adaptations for acquiring resources were key steps in the evolution of vascular plants. Selective permeability of membranes- plasma membrane controls movement of solutes into and out of the cell: passive transport/active transport/transport proteins, proton pumps- h+ gradient that is a form of potential energy. Solute transport in plant cells: transport of many solutes driven by proton gradients, co-transport- transport proteins couple passage of one solute with passage of another (uptake of no3, uptake of sucrose) Water potential affected by: solute potential: proportional to concentration of dissolved molecules, pressure potential: physical pressure on a solution. Transport route between cells: in most plant tissues the cell walls and cytosol are continuous from cell to cell, cytoplasmic continuum, symplast; movement is through plasmodesmata, continuum of cell walls and extracellular spaces: apoplasts. Cohesion and adhesion: the transpirational pull is transmitted all the way from the leaves to the root tips and even into the soil.
