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ROOTS26.2
FunctionAnchor
Absorb – H2O and minerals are “pulled” up through transpiration (H20 evaporates from leaves and pulls water from roots in the process)
GENERAL TYPES
Fibrous
Tap
ADAPTATIONSAdventitious
Aerial
prop
Air
Storage
REGIONS OF DEVELOPMENT
Region of Cell Division – “Apical Meristem”
Region of cell division
Root Cap
REGIONS OF DEVELOPMENT…
Region of Elongation – gives length to root
Region of Cell Division
Region of Elongation
REGIONS OF DEVELOPMENT…
Region of Cell Maturation – differentiate into specialized tissues – “Primary Root Stucture)
Region of Cell Division
Region of Elongation
Region of Maturation
Primary Root Structure1st tissue to develop from Region of MaturationEpidermis- outermost, absorbs, protects, root hairs derived from hereCortex – storage, controls flow of water
Primary Root Structure…
Vascular Cylinder
Pericycle – 2ndary growth from here
Xylem – carries water
Phloem – carries sugar
Epidermis
Cortex
Pericycle
Xylem
Phloem
Secondary Growth
Root hairs
Lateral roots
Types of Root Growth
Primary – growth in length
Secondary – growth in diameter
Arrangement of Vascular tissue
Flowering plants are divided into two groups based on structural differences
Monocots
Dicots
Monocot Root Tissue Arrangement
Dicot Root Arrangement
STEMS23.3
FUNCTION
Support
Conduct water and food
Storage
photosynthesishttp://www.youtube.com/watch?v=w6f2BiFiXiM&feature=related
STRUCTUREEpidermisCambium – mitotic; makes new xylem and phloemPith, Cortex – storageBark – dead cells,protects from water lossVascular tissue – xylem and phloem
Epidermis
Cortex
Cambium
Phloem
Xylem
Pith
Arrangement of Vascular Tissue
Monocot – Vascular tissue is scattered bundles
Dicots – Vascular tissue is arranged in a ring patterm
monocot
dicot
Stem Growth
Meristem - located on tips (growth in height - primary) and on sides (growth of branches - secondary)
Cambium – growth in diameter – secondary; forms tree rings.
Types of StemsWoody
Dead xylem cells form wood; adds strengthGrow in width each yearVascular tissue arranged in ringsBark protectsPerennial – grow more than one season
Type of Stem…Herbaceous
Soft, fleshyUsually green; no barkNot much secondary growth (width)Vascular tissue is scattered.Annuals – only grow one season
Stem Adaptations
Stolons/rhizomes – runners; cause vegetative propagation
Tubers – underground stems; storage; potato
Bulbs/corms – underground stems with fleshy leaves; onions, tulips, garlic
LEAVES23.4
Function
Photosynthesis
Transpiration – pulling water up from the roots and out the leaves
Structure
Epidermis
Upper – covered by cuticle
Lower – contains stoma with guard cells
Cont.
Palisade layer – many chloroplasts
Mesophyll – many air spaces
Vascular bundle – “veins”
VEIN
PalisadeLayer
MesophyllStomata
Epidermis with cuticle
External StructuresPetiole – structure that attached leaf to stemBlade – thin, flat area of leaf; different sizes, shapes & arrangementMid rib – main vein Leaf margin – edge of leaf
Venation in Monocots and Dicots
Monocots – parallel leaf venation
Dicots – netted venation
Pop Quiz
Adaptations in leaves
http://www.youtube.com/watch?v=ktIGVtKdgwo&feature=fvsr
Flowers, Fruits & SeedsCh. 24
Angiosperms
reproduce using flowers.
Flowering Plants have:Monocot Dicot
FlowersMultiples of 3 Multiples of 4 or 5
1
23
4
5
6
23 4
5
6
7
18
6
Flowers
Composed of modified leaves
Sepals – usually green; enclose bud
Petals – brightly colored; just inside sepals
Stamen – male reproductive organ• Filament - stalk• Anther – produces pollen (male gamete)
Carpel (pistil) – female reproductive organ • Stigma- sticky; pollen attaches here• Style – narrow stalk• Ovary – contains ovules
Anther
filament
Parts of a Typical Flower
StamenMale partof flower
AntherFilament
Parts of a Typical Flower
PistilFemale part
of flower(Sounds like “Pigtail”)
Stigma
Style
Ovary
Plant ReproductionPlants can reproduce asexually by
vegetative propagation.
Stems
PlantletsRoots
Stems, plantlets and roots can become a new plant.
Plant ReproductionPlants can reproduce asexually by
plant propagation.
CuttingsGrafting & Budding
A “cut” from a plant cangrow roots when put in soil. Two plants are attached
to form one plant.
Angiosperm Life CyclePollination – transfer of pollen from anther to stigma of carpel
Often dependent on pollinators
Pollen grows a tube through which sperm nuclei travel
Fertilization –
sperm nuclei fuse with ovule inside
produce a seed
Ovary ripens into a fruit
Fruits – ripened ovary ; type determined by structure of ovary and ovules
DryNuts
FleshyDrupes - applePomes - peachBerriesHesperidium - orangePepo - cucumberAggregate - raspberry
Seed Dispersal
Animal
Wind
Water
Seed Germination
Timing controlled by climate (moisture, temperature, etc.)
Endosperm (food source) swells with moisture and cracks open seed coat
Root emerges first
Cotyledons emerge secondMonocot – one seed leaf
Dicot – two seed leaves
Plant Growth
Controlled by hormones (auxins)
Cause “tropisms”
Gravitropism
Thigmotropism
phototropism