Prepare for NEET Biology Transport in Plants (Transpiration) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert guidance to understand water loss, stomatal regulation, and its role in water movement.
NEET Questions / Botany / Transport in Plants / Transpiration
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
The main driving force for transpiration in plants is:
Root pressure
Capillary action
The difference in water potential between the leaf mesophyll and the atmosphere
Active transport of water through the xylem
Which type of transpiration accounts for the majority of water loss in plants?
Cuticular
Lenticular
Stomatal
Hydathode
Guttation is the loss of water in liquid form from plants. This process primarily occurs through:
Stomata
Lenticels
Hydathodes
Cuticle
Which of the following adaptations helps reduce transpiration in xerophytes?
Large, thin leaves
Sunken stomata
Numerous stomata on the upper leaf surface
Thin cuticle
