Q. Regarding root pressure, which one is not correct?
A) It is sufficient to rise water above ground level
B) It is positive in all except the tallest trees
C) It do not act as driving force for the mass flow of sugar
D) It is not able to push water up to small height in the stem
Explanation
Root pressure, a manifestation of active water absorption is a positive pressure, which develops in the sap of xylem of root of the same plant. It is observed maximum in rainy season in tropical plants and during spring in temperate plants. It is commonly met in plants at around 1-2 atm. It is absent in gymnosperms. Normally observed value of root pressure is not able to raise the level of sap to the top of tree and is only able to raise water level upto or above ground
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.