Prepare for NEET Biology Transport in Plants with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert guidance to understand xylem, phloem, and movement of water.
In facilitated diffusion, the movement of molecules across the cell membrane is aided by:
ATP hydrolysis
Membrane proteins
Endocytosis
Exocytosis
Which of the following is an example of diffusion in plants?
Transpiration pull
Transport of sugars through phloem
Uptake of minerals by root hairs
Movement of water through xylem
A researcher modifies a plant's guard cells to overexpress aquaporins. Under water-deficient conditions, which of the following is the MOST LIKELY consequence?
Increased stomatal opening
Increased transpiration
Increased water uptake
Increased stomatal closure
Which of the following scenarios would result in the LOWEST transpiration rate in a mesophytic plant under otherwise normal conditions?
Low atmospheric humidity, dry soil, windy conditions
High atmospheric humidity, dry soil, still air
Low atmospheric humidity, saturated soil, windy conditions
High atmospheric humidity, saturated soil, still air
A plant with a mutation affecting its abscisic acid (ABA) receptors is exposed to drought conditions. Which would be the LEAST likely observation?
Reduced transpiration
Increased leaf wilting
Reduced root growth
Increased expression of drought-responsive genes
Consider a plant exhibiting guttation. Which of the following statements regarding the xylem sap at night is MOST accurate?
Transpiration pull generates negative pressure in the xylem
Root pressure generates positive hydrostatic pressure in the xylem
Cohesion-tension theory is the primary driver of xylem sap movement
Xylem sap movement ceases entirely at night
Which combination of factors would MOST effectively reduce transpiration in a xerophytic plant?
Large leaf surface area, numerous stomata, thin cuticle
Sunken stomata, thin cuticle, extensive leaf venation
Sunken stomata, thick cuticle, reduced leaf surface area
Numerous stomata, thick cuticle, large leaf surface area
The cohesion-tension theory explains the upward movement of water in plants. Which of the following is NOT a critical component of this theory?
Cohesion of water molecules
Adhesion of water molecules to xylem walls
Transpiration pull creating negative pressure
Active transport of water into xylem by root cells
Which of the following is the primary pathway for water movement in plants?
Apoplast
Symplast
Transmembrane
Vacuolar
The process of water loss from plants in the form of vapor is called:
Transpiration
Respiration
Photosynthesis
Guttation
