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📘 How roots find water

Follow moisture sensing, hydrotropism, root hairs, hydraulic redistribution, and shoot feedback.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Moisture gradients
Root tip
Auxin
Root hairs
Water potential
Root architecture
Hydraulic redistribution
Mycorrhizae
Barriers
Shoot feedback

Questions this course answers

What is hydrotropism?

Hydrotropism is directional root growth toward or away from water conditions.

How can auxin help a root bend?

Redistribution of auxin can make one side of the elongation zone grow faster.

What is the main role of root hairs?

Root hairs extend the absorbing surface into soil pores.

What is hydraulic redistribution?

Water follows soil water-potential gradients through connected roots and xylem.

Why can wet soil still be unusable to roots?

Root function depends on oxygen and accessible water potential, not water volume alone.

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