TLS Online TPP Program

#Question id: 13210


In Cohesion–Tension Theory, the pressure gradients needed to move water through the xylem could result from

#Unit 6. System Physiology – Plant
  1. the generation of positive pressures at the base of the plant or negative pressures at the top of the plant
  2. the generation of positive pressure both at the base of the plant and at the top of the plant
  3. the generation of negative pressure both at the base of the plant and at the top of the plant 
  4. the generation of negative pressure at the base of the plant or positive pressure at the top of the plant