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Lecture 14

BIOL 101 Lecture 14: ch 33

by OneClass1178867 , Fall 2016
5 Pages
83 Views

Department
Biology
Course Code
BIOL 101
Professor
Brokaw
Lecture
14

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Plant structure, growth, and
differentiation (Emphasis: the
angiosperms)
Review question:
What stage of the life cycle is the primary angiosperm body?
Sporophyte
Plants can’t move:
Most plants have bodies that can’t relocate
Those bodies still must be capable of acquiring multiple resources
Plant (sporophyte) body
Root System:
Generally underground
Obtains water and dissolved minerals from soil for the plant
Anchors the plant
Composed of primary/lateral roots
Shoot system:
Generally aerial
Obtains sunlight
Exchange gases (co2, oxygen, water vapor)
More complicated than roots:
A vertical stem that bears leaves
Reproductive structures
Leaves- main organs of photosynthesis
Reproductive structures- flowers and fruits in flowering plants
Body as tissue system:
Integrated throughout the plant and body
Roots and shoots
Provides continuity from organ to organ
Plant body has 3 tissue systems:
Ground
3 tissues, 3 cells types
Parenchyma tissues
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Composed of living parenchyma cells with thin primary cell
walls
Functions include:
Photosynthesis
Storage
Secretion
Most metabolic functions
Collenchyma
Composed of collenchyma cells with unevenly thickened
primary cells with thick wall corners
Provides flexible structural support (like celery)
Sclerenchyma
Composed of sclerenchyma cells that have sclereids or
fibers and both are both primary and secondary cell walls
Primary cell wall:
In all cells, expandable
Secondary cell wall:
Some cells
Strong wall
Inside primary wall
Dermal:
Outer protective covering of plant body
Epidermis:
Complex tissue
Covers herbaceous plant body
Waxy cuticle reduces water loss
Secreted by epidermis over aerial parts
Stomata have guard cells
Permit gas exchange with atmosphere
Trichome and root hair (outgrowths or hairs)
Many sizes, shapes, and functions
Periderm: outer bark
Complex tissue
Covers woody parts of plant body
Vascular
Conducts materials throughout plant body and provides strength
and support
Xylem tissue:
Complex tissue, conducts water and dissolved minerals
Conducting cells of xylem are dead at maturity have
tracheids and vessel elements
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Description
Plant structure, growth, and differentiation (Emphasis: the angiosperms) Review question: What stage of the life cycle is the primary angiosperm body? Sporophyte Plants cant move: Most plants have bodies that cant relocate Those bodies still must be capable of acquiring multiple resources Plant (sporophyte) body Root System: Generally underground Obtains water and dissolved minerals from soil for the plant Anchors the plant Composed of primarylateral roots Shoot system: Generally aerial Obtains sunlight Exchange gases (co2, oxygen, water vapor) More complicated than roots: A vertical stem that bears leaves Reproductive structures Leaves main organs of photosynthesis Reproductive structures flowers and fruits in flowering plants Body as tissue system: Integrated throughout the plant and body Roots and shoots Provides continuity from organ to organ Plant body has 3 tissue systems: Ground 3 tissues, 3 cells types Parenchyma tissues
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