NEET · Biology · Transport in Plants doubts
10 doubts found
How does water reach the leaves at the top of a 100-metre-tall tree with no pump?
As leaves transpire, water evaporates from their surfaces and creates a suction (negative pressure) in the xylem.
Why do plants droop and wilt on a hot afternoon but recover by the next morning?
On a hot day, leaves transpire faster than the roots can absorb water.
Why can adding too much fertiliser actually 'burn' and kill a plant?
Roots absorb water by osmosis, which flows from the dilute soil into the more concentrated root cells.
Why do tiny water droplets appear on the tips of grass and leaves early in the morning?
At night transpiration nearly stops, but the roots keep actively absorbing water and minerals, building up root pressure.
What does “Transpiration pull” actually mean in Transport in Plants, and why does it matter for NEET?
water lost from leaves creates a suction that, thanks to water's cohesion, pulls a continuous column up the xylem.
I keep getting “Transpiration pull” questions wrong in Transport in Plants. What's the trap?
thinking the roots push all the water up by themselves.
What does “Turgor pressure” actually mean in Transport in Plants, and why does it matter for NEET?
the pressure of water inside a plant cell that keeps it firm; losing it makes the plant wilt.
I keep getting “Turgor pressure” questions wrong in Transport in Plants. What's the trap?
thinking wilting means the plant is already dead.
What is the difference between transpiration pull and root pressure?
Transpiration pull is the dominant leaf-driven suction that lifts water to great heights; root pressure is a weaker push from the roots, noticeable mainly at night (causing guttation).
What is the difference between osmosis and active transport?
Osmosis moves water passively down a concentration gradient with no energy cost; active transport moves minerals against their gradient and needs ATP.