Trees (Junior Cert Wood Technology): Flashcards

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Transpiration
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Transpiration

Water moves through tree, then into air

Transpiration functions

Cools tree, aids water & nutrient movement

Tree Physiology

Study of life activities in trees for growth & survival

Water Uptake

Roots absorb water from soil, it travels upward in tree

Nutrient Transport

Moving minerals from roots to other tree parts

Environmental Factors (transpiration)

Temperature, humidity, wind affecting tree processes

Where transpiration starts

Water absorption by roots

Cohesion-tension theory

Explains water movement through xylem vessels

Where water exits as vapour

From stomata in the leaves

Transpirational Pull effect

Creates negative pressure in xylem, moves water & nutrients

Temperature effect on transpiration

Speeds up evaporation, may open stomata faster

Humidity effect on transpiration

Reduces transpiration; higher humidity slows it

Wind effect on transpiration

Speeds it up by moving water vapour away from leaves

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