With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples. 

(b) Explain what will happen to a plant cell if it is kept in a solution having higher water potential.

Discuss the factors responsible for ascent of xylem sap in plants.

Water vapour comes out from the plant leaf through stomatal opening. through the same stomatal opening.  carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options

• Both processes can happen together because the diffusion coefficient of water and CO₂ is different

• The above processes happen only during night time

• One process occurs during day time and other at night

• One process occurs during day time and other at night

Which of the following criteria dows not pertain to facilitate transport?

• Requirement of special membrane proteins

• High selectivity

• Transport saturation

• Transport saturation

120.

Roots play insignificant role in absorption of water in

• Sunflower

• Pistia

• Pea

• Pea