Attraction of water molecules to polar surfaces [such as the surface of tracheary elements] is called as:

1. Connation

2. Adnation

3. Cohesion

4. Adhesion

A column of water within xylem vessels of tall trees does not break under its weight

because of

1. dissolved sugars in water

2. tensile strength of water

3. lignification of xylem vessels

4. positive root pressure

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of

1. lignified thick walls

2. cohesion and adhesion

3. weak gravitational pull

4. transpiration pull

Which of the following is a model for Transpiration?

Capillarity is not aided by

The forces which are generated in xylem by transpiration pull can cause lifting of water up to

The rupture and fractionation do not usually occur in water column in vessel/tracheid’s during the ascent of sap because of:

1. Lignified thick walls

2. Cohesion and adhesion

3. Weak gravitational pull

4. Transpiration pull

A structural attribute of guard cells that aid in its effective functioning is

1. Large cell size

2. Radial micellation in walls

3. Thick walls

4. All of the above