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

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

Capillarity is not aided by

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