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Lecture 14

BIOL 101 Lecture Notes - Lecture 14: Sporophyte, Flowering Plant, Parenchyma

5 pages83 viewsFall 2016

Course Code
BIOL 101

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Plant structure, growth, and
differentiation (Emphasis: the
Review question:
What stage of the life cycle is the primary angiosperm body?
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:
3 tissues, 3 cells types
Parenchyma tissues
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Composed of living parenchyma cells with thin primary cell
Functions include:
Most metabolic functions
Composed of collenchyma cells with unevenly thickened
primary cells with thick wall corners
Provides flexible structural support (like celery)
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
Outer protective covering of plant body
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
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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