Prepare for NEET Biology Transport in Plants (Plant Water Relations) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert guidance to understand water potential and its components.
NEET Questions / Botany / Transport in Plants / Plant Water Relations
A xerophyte with a CAM pathway faces prolonged drought conditions. Which of the following physiological responses would be LEAST likely to occur?
Increased stomatal aperture during the day
Accumulation of organic acids at night
Reduced transpiration rates
Increased root-to-shoot ratio
The apoplast pathway in plants is interrupted by the Casparian strip. Which of the following statements about its impact on water movement is most accurate?
It forces water and dissolved minerals to enter the symplast before reaching the stele.
It facilitates the rapid movement of water through the cortex via plasmodesmata.
It prevents the passage of water into the root hair cells.
It increases the rate of transpiration by reducing the resistance to water flow.
Which of the following combinations of factors would result in the HIGHEST rate of transpiration in a mesophytic plant?
High temperature, low humidity, high wind speed, open stomata
Low temperature, high humidity, low wind speed, open stomata
High temperature, high humidity, high wind speed, closed stomata
Low temperature, low humidity, low wind speed, closed stomata
A plant cell with a water potential of -0.6 MPa is placed in a solution with a water potential of -0.8 MPa. Which of the following will occur?
Water will move out of the cell, causing plasmolysis.
Water will move into the cell, causing turgor pressure to increase.
There will be no net movement of water.
The cell will burst due to excessive water uptake.
Guttation in plants is primarily caused by:
Root pressure exceeding transpiration pull
High transpiration rates during the day
Opening of stomata at night
Active transport of water into xylem vessels
The cohesion-tension theory explains the ascent of sap in tall trees. Which of the following factors LEAST contributes to the maintenance of the continuous water column?
Active transport of water into xylem vessels
Cohesion between water molecules
Adhesion of water molecules to xylem walls
Transpiration pull generated by evaporation from leaves
Which of the following contributes the most to the long-distance transport of water in tall trees?
Root pressure
Capillary action
Transpiration
Active transport by xylem cells
The process by which water is absorbed by solids like colloids causing them to increase in volume is called:
Osmosis
Diffusion
Plasmolysis
Imbibition
Which of the following is NOT a factor affecting the rate of transpiration?
Light intensity
Temperature
Humidity
Amount of water absorbed by roots
A plant cell placed in a hypotonic solution will:
Become plasmolysed
Become flaccid
Become turgid
Remain unchanged
