How to get water into plants
Root hairs: root epidermal cells, take up water and nutrients
Re-visit Osmosis (chapter 6): diffusion of water to the side with the greater concentration of solute (equals diffusion to the side with lower “water concentration”)
Osmotic gradient: root cells take up minerals by active cell membrane transporter proteins (requires energy, ATP) ? increases solute concentration inside root cells, pulls water in
Aquaporins: water-selective uptake pores in cell membranes