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.
Which of these cells regulate the opening and closing of stomata?
Guard cells
Epidermal cells
Mesophyll cells
Xylem cells
Root hairs absorb water primarily through:
Osmosis
Diffusion
Active transport
Facilitated diffusion
The upward movement of water against gravity in tall trees is primarily due to:
Transpiration pull
Root pressure
Capillary action
Active transport
Guttation in plants is the loss of water in the form of:
Liquid droplets
Water vapor
Ice crystals
Water soluble salts
A C4 plant exhibiting high stomatal conductance in response to elevated atmospheric CO2 experiences a sudden drop in CO2 levels. Which of the following is the MOST likely immediate consequence regarding the transpiration and photosynthesis compromise?
Increased transpiration and decreased photosynthetic rate
Decreased transpiration and increased photosynthetic rate
Decreased transpiration and decreased photosynthetic rate
No significant change in either transpiration or photosynthetic rate
In a CAM plant experiencing prolonged water stress, which adaptation is MOST likely to minimize the transpiration and photosynthesis compromise?
Increased stomatal density
Further temporal separation of CO2 uptake and fixation
Shifting from CAM to C4 photosynthesis
Reducing leaf surface area
A researcher observes that a plant species exhibits a lower transpiration rate and higher water use efficiency (WUE) under high light intensity compared to low light. Which physiological adaptation BEST explains this observation?
Increased leaf thickness
Deeper root system
Increased chlorophyll content
Partial stomatal closure
How does the boundary layer resistance affect the transpiration and photosynthesis compromise?
A thicker boundary layer increases transpiration and enhances CO2 diffusion.
A thicker boundary layer reduces transpiration but also limits CO2 diffusion to the leaf surface.
Boundary layer resistance has no impact on either transpiration or CO2 diffusion.
A thinner boundary layer reduces transpiration and limits CO2 diffusion.
Under conditions of high temperature and low humidity, which factor MOST directly exacerbates the transpiration and photosynthesis compromise?
Decreased CO2 concentration
Increased vapor pressure deficit
Reduced soil water potential
Elevated atmospheric pressure
Imagine a mutant plant with stomata that are less sensitive to abscisic acid (ABA). Under drought conditions, compared to a wild-type plant, this mutant would MOST likely exhibit:
Lower transpiration rate and higher photosynthetic rate
Higher transpiration rate and lower photosynthetic rate
Lower transpiration rate and lower photosynthetic rate
Higher transpiration rate and higher photosynthetic rate
