Plant Water Relations

Internal Plant Factors

Structure of the Leaf

Variations in leaf structure to reduce transpiration:

Xerophytic plants have

small leaves

thick cuticle

sunken stomata

covering of epidermal hairs

well developed palisade parenchyma to reduce transpiration

increased wax deposits on leaves

conifers like pines have leaves reduced to spines

shedding of leaves by deciduous plants in dry or cold seasons

Root - Shoot Ratio

An increase in the root - shoot ratio increases the rate of transpiration.

Sites of Transpiration

Stomata

Cuticle

Lenticels

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	Introduction
	Absorption and Movement of Water
	Plasmolysis
	Permeability
	Water Potential
	Imbibition
	Availability of Water in the Soil
	Absorption of Water by Plants
	Passage of Water in Root or Pathway of Water in Root
	Theories for Ascent of Sap
	Guttation
	Transpiration
	Internal Plant Factors
	Role of Stomata in Transpiration
	Mechanism of Stomatal Action
	Summary
	Points to Remember
	Some Interesting Features
Animations
	Opening and Closing of a Stoma

Subjects
English
Math
Geometry