Question

Who coined the term 'root pressure theory'?

• A. Charles Darwin
• B. Stephen Hales
• C. J. Priestley
• D. Julius von Sachs

Hint:

Root pressure can be observed through phenomena like guttation, where water droplets appear at the leaf margins of certain plants early in the morning.

Answer 1

The Correct Option is C

J. Priestley originated the term 'root pressure theory'. This theory elucidates how plants generate pressure within their roots to propel water upwards through the xylem. Root pressure arises from osmotic forces driven by the active transport of ions into the root xylem.

Key Points: Root pressure is most prominent at night or when transpiration rates are low. While it aids water ascent in smaller plants, it is inadequate for explaining water transport in tall trees.