Question

Which one of the following theories for ascent of sap was proposed by the eminent Indian scientist J. C. Bose?

• A. Relay pump theory
• B. Pulsation theory
• C. Root pressure theory
• D. Transpiration pull theory

Answer 1

The correct option is B

Pulsation theory

The theory of ascent of sap was put forward by J. C. Bose in 1923 which is called the vital force theory or pulsation theory. The theory says that the innermost cortical cells of the root absorb water from the outer side and pump the same into xylem channels.