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 the following is NOT a direct consequence of root pressure?
Exudation of water droplets from hydathodes
Upward movement of water in the xylem
Opening and closing of stomata
Development of positive pressure in the xylem
The main difference between root pressure and transpiration pull is that:
Root pressure pushes water up the xylem, while transpiration pull pushes water down from the leaves.
Root pressure occurs only at night, while transpiration pull occurs only during the day.
Root pressure is active transport, while transpiration pull is passive transport.
Root pressure is a positive pressure generated in the roots, while transpiration pull is a negative pressure generated in the leaves.
A plant is exposed to high light intensity and limited water availability. Which of the following is the most likely physiological response?
Increased stomatal opening to maximize CO2 uptake for photosynthesis.
No change in stomatal aperture, maintaining a balance between transpiration and photosynthesis.
Complete closure of stomata to prevent water loss, halting photosynthesis.
Partial closure of stomata to reduce transpiration, even at the cost of reduced CO2 uptake for photosynthesis.
Which of the following environmental factors would MOST directly influence the transpiration-photosynthesis compromise?
Light intensity
Air humidity
CO2 concentration
Soil nutrient availability
How do CAM plants minimize the transpiration-photosynthesis compromise?
By increasing the number of stomata on their leaves.
By opening stomata at night and storing CO2 for daytime use.
By having thicker leaves to store more water.
By performing photosynthesis only at night.
Which adaptation is LEAST likely to be found in plants adapted to arid environments?
Sunken stomata
Thick cuticle
Large, thin leaves
Succulence
If a plant's stomata are completely closed, which of the following would be the most immediate consequence?
Increased transpiration
No CO2 uptake and cessation of photosynthesis
Increased water uptake by roots
Wilting of leaves
The transpiration-photosynthesis compromise is most pronounced in which type of environment?
Cool and humid
Hot and humid
Hot and dry
Cool and dry
Which of the following is NOT a passive process involved in the uptake of mineral ions by plants?
Diffusion
Mass flow
Ion exchange
Active transport
The initial uptake of mineral ions by root hairs is primarily through:
Active transport
Diffusion
Osmosis
Bulk flow
