During the transpiration stream, water and dissolved minerals are absorbed from the environment and transported through vascular plant tissues into the atmosphere. In what physiological order does water move through a vascular plant from initial uptake to eventual release?
- 1Water and dissolved inorganic minerals are absorbed from the soil into root hair cells via osmosis.
- 2Water moves radially across the root cortex and traverses the endodermis through the symplast to enter the central vascular cylinder.
- 3Water ascends vertically through non-living xylem vessel elements under negative pressure maintained by cohesion and adhesion.
- 4Water evaporates from leaf mesophyll cell walls into substomatal cavities and diffuses out into the atmosphere through open stomata.
Cevap
The correct physiological sequence is: absorption by root hair cells from the soil, radial movement through the root cortex and endodermis into the central vascular cylinder, upward ascent through stem xylem vessel elements driven by cohesion-tension, and evaporative diffusion from leaf mesophyll into substomatal cavities and out through open stomata.
Water transport in vascular plants follows a strict sequential gradient of decreasing water potential (). The pathway begins at the soil-root interface where root hairs absorb moisture, proceeds radially across the cortex and through the endodermis, continues upward through xylem vessel conduits via cohesion-tension mechanics, and concludes with evaporation from leaf mesophyll into intercellular air pockets and subsequent transpirational exit through open stomata.
Adım Adım Çözüm
Anahtar Kavram
The Transpiration Stream and Cohesion-Tension Water Transport Pathway
Tahmini Süre:1m 30s