The primary mechanism for xylem sap ascent in tall trees is transpiration pull. However, root pressure plays a minor role. Which statement BEST describes the limited contribution of root pressure to overall xylem sap ascent in tall trees?
Root pressure generates excessive pressure that could damage the delicate xylem tissues in tall trees.
Root pressure is only active during the night and therefore cannot contribute to daytime transpiration.
Tall trees have a significantly lower root surface area to volume ratio, minimizing the contribution of root pressure.
Root pressure can only push water a limited height due to the opposing force of gravity and the relatively low pressure generated.
Related Questions
According to the transpiration-cohesion theory, the upward pull of water is transmitted to other water molecules by cohesion, which is caused by
    Hydrogen bond
Hydrophilic cell walls   Â
Turgor pressure
Osmosis
Which process, unlike transpiration, results in the loss of water in liquid form from plants?
Evaporation
Transpiration
Guttation
Condensation
The process of guttation takes place?
Herbaceous stems
Leaf tips
Woody stems
All of these
The primary reason for a passive flow of water from soil into the atmosphere through the plant body is?
Cohesive forces
Adhesive forces
Tension
Water potential gradient
Guttation place through
Lenticel
Hydathodes
Both 1 and 2
None of these
    The rupture and fractionation do not usually occur in the water column in vessles/tracheids during the ascent of sap because of
    Lignified thick walls
Cohesion and adhesion
Wak gravitational pull
Transpiration pull
The process by which water droplets are observed on the tips of grass blades in the early morning is known as:
Transpiration
Evaporation
Condensation
Guttation
Read the following statements and choose the correct option given below I. Major account of transpiration takes places through surface/margin of leaves II. A little amount of water is lost through stem, this is reffered to cauline transpiration III. Transpiration is comparatively a slow process then evaporation IV. Transpiration driven ascent of sap does not depend on cohesion, adhesion and surface tension properties of water
I, II, III and IV
I, II and III
I, II and IV
II, III and IV
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is
Transpiration
Root pressure
Imbibition
Plasmolysis
The magnitude of root pressure ranges between
2-5 atm
1-5 atm
0.1-0.2 atm
4-6 atm
