CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 2 - MCQExams.com

• Solute potential is also called as osmotic potential. It is the potential of a solution that allows the water to enter in it by diffusion or osmosis due to the presence of the solute material. Since solution B has lower solute concentration as compared to that in solution A, solution B has lower solute potential.

• Transpiration is the process in which plants release the water inside it in the form of moisture or water vapor to the external atmosphere.
  
• Water is transient (lasting only for a short time) in plants. Less than 1 %of the water reaching the leaves is used in photosynthesis and plant growth. Most of it is lost through the stomata in the leaves. This water loss is known as transpiration.
• Hence the excess water is lost by stomata by the process of  Transpiration.
• So, the correct answer is 'Transpiration'.

• The movement of water into the cell depends on the Diffusion Pressure Deficit (DPD) or the suction pressure of the cell. 
• A cell that is having more solutes than solvent will have less diffusion pressure and more suction pressure. So, water will move from the adjacent cell having less DPD.

Osmosis is defined as the movement of solvent particles from a region of high concentration to a region of low concentration across a semipermeable membrane. In this case, the water is the solvent, and it moves into the cells because there is a lower solvent concentration (but high solute concentration) within the cells this will take place until the concentration of water is the same inside the cell as outside. So, the correct answer is 'Concentration of water is the same inside the cell as outside'.

Correct option: B.
Explanation:

• Root pressure is the positive pressure that develops in the roots of the plants by the active absorption of nutrients from the soil.
• The active absorption depends on the active accumulation of solute in xylem sap.
• Root pressure is maximum when transpiration is very low and absorption is high because transpiration is the output of water from a plant, and absorption is the input of water into a plant.
• If the output is low and the input is high, the pressure will be at its greatest. 
  So, the correct answer is 'Transpiration is very low and absorption is high'.

• Saturated air is the air that holds water vapor at its highest level.
  
• Guttation is an important process that occurs when conditions are humid and transpiration loss is limited. 
• Under such conditions, excess water absorbed by roots oozes out through hydathodes in liquid form. 

• Guttation is the loss of water in liquid form as a dilute solution of water, salts, and sugars from uninjured leaf tips. 
• The uninjured leaf tips have hydathodes or water stomata. 
• Under conditions of low transpiration dilute solution of minerals oozes out through them under the influence of increased root pressure.

• Guttation is a process by which plants get rid of excess water when transpiration loss is less and soil is well watered. 
• This process occurs through the hydathodes.

• Water flows from lower DPD to higher DPD. Here the DPD of two cells A and B are 3 and 5 atmosphere respectively.