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📘 How plants pull water upward

Follow water from roots through xylem as transpiration, cohesion, stomata, and tension do the work.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Root uptake
Xylem
Transpiration
Cohesion
Leaf veins
Stomata
Water potential
Cavitation
Tall trees
Daily cycle

Questions this course answers

What tissue carries water upward through a plant?

Xylem conduits transport water and dissolved minerals from roots toward leaves.

Where is the main pulling force generated in a tall plant?

Transpiration creates tension at evaporating leaf interfaces that is transmitted through xylem.

What do guard cells control?

Guard-cell turgor changes open and close stomatal pores.

What is an xylem embolism?

Cavitation can create a gas bubble that interrupts water conduction.

Why can drought close stomata?

Closure conserves water and limits hydraulic stress, although it also restricts carbon dioxide entry.

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