What could be considered as the most significant contribution of root pressure in the process of water transport?

1.	It provides a push which plays a major role in movement of water up the trees
2.	It re-establishes the continuous chain of water molecules in the xylem which often breaks under the enormous tension created by transpiration
3.	It helps in active transport of various ions into the vascular tissues of the root from the soil
4.	It helps in loss of excess water in its liquid phase (guttation)

Which of the following is not observed during apoplastic pathway?

Addition of more solutes in a given solution will:
1. not affect the water potential at all
2. raise its water potential
3. lower its water potential
4. make its water potential zero

Which of the following statements above facilitated diffusion is incorrect? 

Phloem sap in the plants mainly consists of : 
1. fructose and water 
2. fructose and sucrose 
3. glucose and water 
4. sucrose and water 

Which of the following physical properties of water is/are responsible for providing water, the high tensile strength and high capillarity during ascent of sap in the plants? 
1. Surface tension and cohesion 
2. Cohesion, adhesion and surface tension 
3. Cohesion only 
4. Adhesion and cohesion 

Which of the following was proved by girdling experiment?