Root pressure is responsible for ascent of sap in :
A.
Herbs
B.
Tall trees
C.
Conifers
D.All angiosperms
Answers
Answer is option a) herbs
Root pressure only offers a modest push and can transport water and minerals only up to a short height as in herbs.
In tall plants ascent of sap is by transpiration pull.
Hope this helps you ☺️
Mark it as brainliest
Answer:
Under certain conditions, plants exhibit exudation of the xylem sap from the stump of a freshly cut stem.
Most of such exudations result from the development of a pressure in the dilute sap of the xylem ducts resulting from the operation of mechanism in the roots, termed the root pressure. It can also be shown experimentally that water is forced up the stem by root pressure.
This led to the view that root pressure is the mean by which water is raised in tall trees. The maximum of observed root pressure is 5 to 6 bars.
However, many trees have height much in excess of 10 m. Furthermore, many tall trees e.g., conifers have no demonstrable root pressure, neither is the rate of flow adequate to compensate for the known rates of transpiration.
In addition to these objections, there is another difficulty that at times of rapid transpiration; plants actually show negative root pressure. The cut ends of stem, instead of exuding sap actually absorb water if it is supplied at the cut surface. All these objections support the argument that root pressure is not an important factor in water translocation.