Tissues and the Primary Growth of Stems Flashcards
Two main divisions of plants
- Vascular
- Non-vascular
plants with vascular tissues, particularly xylem and phloem for conducting water and integrating food
vascular plants (tracheophytes)
lac specialized vascular system for transporting water and nutrients
non-vascular plants (mosses sensu lato)
Two divisions of vascular plants
- Seed plants (Spermatophytes)
- Pteridophytes (Ferns sensu lato)
Two types of seed plants
- Gymnosperms
- Magnoliophyta (Angiosperms)
flowering plants and have seeds enclosed within their fruit
angiosperms
have no flower or fruits and have naked seeds on the surface of their leaves
gymnosperm
gymnosperm seeds are configured as __
cones
Characteristics of non-vascular plants
- can be found in walls
- do not increase in size
- may spread
- get their nutrients through diffusion
vascular plants that disperses spores
Pteridophyte
- cells that divide for life of plant
- can give rise to all plant structures
Meristems
- epidermal hair
- a major function of it is to be in plant defense
trichome
single cotyledon
Monocots
two cotyledon
Dicots
narrow long leaf, parallel veins
Monocots
flower parts in multiples of three
Monocots
fibrous roots
Monocots
broad leaf, network of veins
Dicots
ring of vascular bundles
Dicots
has main roots, extensions of roots
Dicots
Two (2) types of Plant Body
- Primary Plant Body
- Secondary Plant Body
derived from shoot and root apical meristems
Primary Plant Body
composed of primary issues
Primary Plant Body
constitutes the herbaceous parts of a plant
Primary Plant Body
derived from meristems other than apical meristems
Secondary Plant Body
composed of secondary tissues
Secondary Plant Body
What are the secondary tissues?
wood, bark
Where can the primary tissues be found in woody plants?
Shoot, root
- region of cells capable of division and growth in the root and shoot tips in plants
- increase in height
Apical Meristems
- found in plants that exhibit secondary growth
- give rise to secondary tissues
- cylinders within the plant body
Lateral meristem
Two (2) types of Lateral meristem
- Cork Cambium
- Vascular Cambium
- produces the cork and the secondary cortex
- develops from the secondary lateral meristem
Cork cambium
- produces secondary xylem and secondary phloem
- develops from the apical meristem
Vascular cambium
Three (3) Basic Types of Plant Cells and Tissues
- Parenchyma
- Collenchyma
- Sclerenchyma
thin, primary walls
Parenchyma
typically alive at maturity
Parenchyma and Collenchyma
has many functions
Parenchyma
unevenly thicken primary walls
Collenchyma
provide plastic support
Collenchyma
not abundant
Collenchyma
primary walls plus secondary walls
Sclerenchyma
many dead at maturity
Sclerenchyma
provide elastic support and some (tracheary elements) are involved in water transport
Sclerenchyma
Three (3) types of parenchyma
- Chlorenchyma
- Glandular cells
- Transfer cells
- cells that are capable of performing photosynthesis
- many guard cells
Chlorenchyma
capable of producing nectar and resin
Glandular cells
- specialized parenchyma cells
- facilitate the transport of sugars from a sugar source, mainly mature leaves, to a sugar sink, often developing leaves or fruits
Transfer cells
- typically found at elongating shoot tips
- absent in developing roots
Collenchyma
- mature cells
- undergo lignification
Sclerenchyma
enhance plant cell wall rigidity, hydrophobic properties and promotes minerals transport through the vascular bundles in plant
Lignin
Two (2) types of Sclerenchyma
- Mechanical (non-conducting) sclerenchyma
- Conducting sclerenchyma
- typically cuboidal
- sclereids
- fibers
Mechanical (non-conducting) sclerenchyma
- more or less isodiametric
- often dead at maturity
Sclereids
- long
- many types are dead, other types remain alive and involved in storage
Fibers
- transport of materials (minerals)
- Tracheids
- Vessel Elements
Conducting sclerenchyma (tracheary elements)
- long and narrow with tapered ends
- contain no perforations
- dead at maturity
- found in all vascular plants
Tracheids
- short and wide with rather perpendicular end walls
- must contain one or two perforations
- dead at maturity
- found in almost exclusively in flowering plants
Vessel Elements
Location of Parenchyma
stem, root, leaves, flowers, fruits widely distributed
Location of Collenchyma
below the epidermis
Location of Sclerenchyma
outermost boundaries of plant parts, cortex, pith, hard seeds etc.
Function of Parenchyma
- stores and assimilates food
- provides mechanical support (turgidity)
- store waste products like tannin, gum, resins, etc.
Function of Collenchyma
- provides mechanical support and elasticity
- manufacture sugar and starch
Function of Sclerenchyma
provides mechanical support
bud located at the apex of the stem where most of the plant growth occurs
Terminal Bud
sprout that develops in the axil of a plant, which is the angle formed by the upper side of the stem and an outgrowing leaf or a branch
Axillary Bud
location on a stem where the leaves or branches are attached
Node
interval or part between two nodes of a stem
Internode
acute angle between a vine shoot and a leaf stem or petiole extending from the shoot
Leaf axil
Mark left by a leaf after it falls off the twig
Leaf scar
how leaves are arranged on the stem
Phyllotaxy
Five (5) arrangements of phyllotaxy
- Alternate
- Opposite
- Decussate
- Whorled
- Spiral
stem + leaves, flowers or buds that may be present
Shoot
a slender whiplike or threadlike strand, produced usually from the node of a stem, by which a vine or other plant may climb
Stem tendrils
slender stem that grows horizontally along the ground, giving rise to roots and aerial (vertical) branches at specialized points called nodes
Runner
fleshy underground stems
Rhizomes
Example of a rhizome
ginger
- modified stem that is the resting stage of certain seed plant
- consists of a relatively large, usually globe-shaped, underground bud with membranous or fleshy overlapping leaves arising from a short stem
bulb
flattened stem
Cladophyll
enlarged underground stems that store nutrients, surrounded by papery outer layers
Corm
underground stem in which the stem tissue serves as the primary storage tissue, but has no basal plate
Tuber
Arrangement of primary tissues
function is related to tis structure
In order to function properly, a tissue must _____. In order to function properly, the tissues of an organ must _____.
- Must contain the right cells in the proper arrangement.
- must be arranged correctly
microscopic pores on the lower epidermis of the leaf
stomata
pairs of epidermal cells that control gas diffusion by regulating the opening and closure of stomatal pores
Guard cells