Question

Who coined the term “Root Pressure Theory”?

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

Hint:

Root pressure is mainly effective in small plants and during nighttime when transpiration is low. It can be observed in phenomena like guttation.

Answer 1

The Correct Option is C

Concept: Root pressure refers to the positive pressure developed in the roots of plants due to the osmotic movement of water into root cells. This pressure helps in the upward movement of water through the xylem, especially during conditions of low transpiration such as at night. The concept of root pressure plays a significant role in understanding water transport in plants.

Step 1: Understanding the term “Root Pressure Theory”.
The term describes the mechanism by which water is pushed upward from the roots due to osmotic forces. This idea was studied and explained in early plant physiology research.

Step 2: Identifying the scientist associated with the term.

• Julius von Sachs contributed to experimental plant physiology but did not coin this term.
• Stephen Hales studied transpiration and water movement but is not credited with this terminology.
• J. Priestley is credited with coining the term “Root Pressure Theory” while studying plant physiology.
• Charles Darwin worked extensively on plant movement, not root pressure.

Step 3: Conclusion.
Thus, the correct answer is J. Priestley.