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📘 Water enters through the root system

A plant's upward water journey begins in thin films around soil particles.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Roots to leavesTrace water from root uptake through xylem to the leaf.Root hairs and selective tissues begin the plant’s water pathway.
  2. The leaf controls flowExplain how leaf veins and stomata distribute and regulate water loss.Veins bring water near evaporating cells while guard cells adjust the outlet.
  3. Hydraulic limitsExplain how water potential, embolism, and height constrain transport.A soil-to-atmosphere gradient drives flow, but gravity and air bubbles add risk.

Questions this course answers

What tissue carries most 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 and transmits it through xylem.

What do guard cells control?

Changes in guard-cell turgor open and close stomatal pores.

What is an xylem embolism?

Cavitation can create a gas bubble that interrupts water conduction.

Why can drought cause stomata to close?

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

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