Question
Biology Question on Transport in Plants
Root pressure is maximum when:
A
transpiration is low and absorbtion is high
B
transpiration is high and absorbtion is low
C
both (a) and (b)
D
both transpiration and absorption are low
Answer
transpiration is low and absorbtion is high
Explanation
Solution
Root pressure theory was put forward by Priostley (1916). Root pressure is a positive pressure that develops in the xylem sap of the root of some plants. It is maximum during rainy season when transpiration is low and absorption of water by the root is high.