Question

15. As there are vast number of root hairs and root cells involved, a pressure in the
xylem vessels develops with forces the water upwards. What is the total
pres-
sure called ?​

Answer 1

Answer:

transpiration pull (during day)

hydrostatic pressure (at night)

Explanation:

here

during transpiration, the loss of water in the form of water vapour from the leaf cell creates a suction force or pressure known as transpiration pull. which is responsible for the upward movement of sap means water and minerals dissolved in it from roots to lea

also

during night time, in the absence of sunlight plants performs an another strategy to create a suction force known as the hydrostatic pressure

hope it will help u!!!!