Question

The condition required for transpiration (water to move through the plant from the soil to the air) is
{Note: soil water potential (\( \psi_{\text{soil}} \)), root water potential (\( \psi_{\text{root}} \)), leaf water potential (\( \psi_{\text{leaf}} \)), water potential in the atmosphere (\( \psi_{\text{atmosphere}} \))\

• A. \( \psi_{\text{soil}} > \psi_{\text{root}} > \psi_{\text{leaf}} > \psi_{\text{atmosphere}} \)
• B. \( \psi_{\text{root}} > \psi_{\text{soil}} > \psi_{\text{leaf}} > \psi_{\text{atmosphere}} \)
• C. \( \psi_{\text{root}} > \psi_{\text{soil}} > \psi_{\text{atmosphere}} > \psi_{\text{leaf}} \)
• D. \( \psi_{\text{root}} > \psi_{\text{atmosphere}} > \psi_{\text{soil}} > \psi_{\text{leaf}} \)

Hint:

Water always moves from high potential to low potential.
For water to flow from the soil, through the plant, and out into the air, the water potential must become increasingly negative along the path: Soil \( \rightarrow \) Root \( \rightarrow \) Leaf \( \rightarrow \) Atmosphere.

Answer 1

The Correct Option is A