Roots, Stem and Leaves
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Leaves Stem Roots Types of Root System Regions of the Root Stem Modifications Root Modifications Roots, Stem and Leaves • Perform photosynthesis • Lateral dissimilar appendages of the stem • Have leaf base, petiole and leaf lamina • Borne at the node of the stem • Do not possess any apical bud or a regular growing point • The descending portion of the plant axis • Non-green or brown in colour, absorb water from soil • Positively geotropic • Not further differentiated into nodes and internodes • Do not bear leaves and buds For food storage Example: Potato For food storage Example: Carrot Hanging roots for support Example: Banyan For respiration Example: Mangrove Tendrils for support Example: Cucumber Thorns for defence Example: Bougainvillea For vegetative propagation For photosynthesis Example: Opuntia Leaf Venation: Arrangement of veins Types of Leaf Shapes • Is an ascending axis of the plant • Differentiated into nodes and internodes • Young stem is green and photosynthetic • Negatively geotropic and positively phototropic • Bears a terminal bud for growth in length • Taproot System: Develops from radicle of the germinating seed • Fibrous Root System: Develops from the stem in the form of thin branching roots without any primary root Lanceolate Sagittate Obovate Obcordate Acicular Hastate Orbicular Cuneate Lyrate Oblique Oblancoelate Oblong Elliptical Cordate Ovate Reniform Linear Taproot Fibrous Reticulate Venation Parallel Venation Region of Maturation Region of Elongation Root cap Root hair Region of Meristematic Activity Runner Example: Grass Sucker Example: Chrysanthemum Offset Example: Pistia Stolon Example: Mint Morphology of Flowering Plants
Transcript of Roots, Stem and Leaves
Life Processes - Excretion
Leaves Stem
Roots Types of Root System
Regions of the Root
Stem Modi�cations
Root Modi�cations
Roots, Stem and Leaves• Perform photosynthesis• Lateral dissimilar appendages of the stem• Have leaf base, petiole and leaf lamina• Borne at the node of the stem• Do not possess any apical bud or a regular growing point
• The descending portion of the plant axis• Non-green or brown in colour, absorb water from soil• Positively geotropic• Not further di�erentiated into nodes and internodes• Do not bear leaves and buds
For food storageExample: Potato
For food storageExample: Carrot
Hanging roots for supportExample: Banyan
For respirationExample: Mangrove
Tendrils for supportExample: Cucumber
Thorns for defenceExample: Bougainvillea
For vegetative propagation
For photosynthesisExample: Opuntia
Leaf Venation: Arrangement of veins
Types of Leaf Shapes
• Is an ascending axis of the plant• Di�erentiated into nodes and internodes• Young stem is green and photosynthetic• Negatively geotropic and positively phototropic• Bears a terminal bud for growth in length
• Taproot System: Develops from radicle of the germinating seed• Fibrous Root System: Develops from the stem in the form of thin branching roots without any primary root
Lanceolate
Sagittate
ObovateObcordateAcicular Hastate Orbicular Cuneate LyrateOblique
OblancoelateOblong Elliptical CordateOvate ReniformLinear
Lateral dissimilar appendages of the stem
The descending portion of the plant axis
Not further di�erentiated into nodes and
Taproot FibrousTaproot
Reticulate VenationReticulate Venation
For photosynthesis
Parallel Venation
Leaf Venation: Arrangement of veins
Parallel Venation
Thorns for defenceFor food storage
Regions of the Root
Region ofMaturation
Region of Elongation
Root cap
Root hair
Region ofMeristematic Activity
RunnerExample: Grass
SuckerExample: Chrysanthemum
OffsetExample: Pistia
StolonExample: Mint
Tendrils for support Thorns for defenceTendrils for support
Oblong Oblancoelate
Morphology of Flowering Plants
