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110 terms

BOT Lecture 3

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Anthophyta
a phylum of 300,000+ species. It contains the angiospems (flowering plants)
Monocots
1 of the 2 major groups of angioperms; Grass plants. Have one cotyledon (Ex: lillies, orchids, palms)
Dicots
Refers to all angiosperms other than monocots; characterized by having two cotyledon (Ex: sunflowers, roses, oaks, mustards)
Stamen
The part of the flower producing the pollen, composed usually of anther and filament; collectively the stamens make up the androecium
Anther
the pollen-bearing portion of the stamen (penis)
Filament
the stalk of a stamen
Pistil
A term sometimes used to refer to an individual carpel or a group of fused carpels
Stigma
the region of the carpel that serves as a receptive surface for pollen grains and on which they germinate
Style
A slender column of tissue that arises from the top of the ovary and through which the pollen tube grows
Ovary
the enlarged basal portion of carpel or of a gynoecium composed of fused carpels; a mature ovary, sometimes with other adherent parts is a fruit
Ovule
A structure in seed plants containing the female gametophyte with egg cell, all being surrounded by the nucellus and one or two integuments; when mature, an ovule becomes a seed
Sepal petal
One of the outermost flower structures, a unit of the calyx; sepals usually enclose (protect) other flower parts in the bud
Receptacle
The part of the axis of a flower stalk that bears the floral organs
Locule
A cavity within a sporangium or a cavity of the ovary in which ovules occur
pollen sacs
A cavity in the anther that contains the pollen grains
sporophyte
The spore-producing, diploid (2n) phase in a life cycle characterized by alternation of generations
gametophyte
In plants that have alternation of generations, the haploid (n), gamete-producing generation, or phase.
microsporocyte
(OR microspore mother cell) A cell in which meiosis will occur, resulting in four microspores; in seed plants, often called a pollen mother cell
microspore
In heterosporous plants, a spore that develops into a male gametophyte
megasporocyte
(OR megaspore mother cell) A diploid cell in which meiosis will occur, resulting in the production of four megaspores
megaspore
In heterosporous plant, a haploid (n) spore that develops into a female gametophyte; in most groups, megaspores are larger then microspores
megagametophyte (female gametophyte)
female gametophyte, located within the ovule of seed plants (7 cells - 8 nuclei)
microgametophyte (male gametophyte)
male gametophyte (MATURE: 2 sperm cells, 1 tube cell)
integuments
The outermost layer or layers of tissues enveloping the nucellus of an ovule; develops into the seed coat
micropyle
In the ovules of seed plants, the opening in the integuments through which the pollen tube usually enters
egg cell
A nonmotile female gamete, usually larger than a male gamete of the same species
antipodal cells
three (sometimes more) cells of the mature embryo sac, located at the end opposite the micropyle
synergids
Two short lived cells lying close to the egg in the mature embryo sac of the ovule of flowering plants
polar nuclei
Two nuclei (usually); one derived from each end (pole) of the embryo sac, which becomes centrally located; they fuse with a male nucleus to form the primary (typically 3n) endosperm nucleus.
sperm cells
A mature male gamete, usually motile and smaller than the female gamete.
tube cell
In male gametophytes, or pollen grains, of seed plants, the cell the develops into the pollen tubes
double fertilization
The fusion of the egg and sperm (resulting in a 2n fertilized egg, the zygote) and the simultaneous fusion of the second male gamete with the polar nuclei (typically resulting in a 3n primary endosperm nucleus); a unique characteristic of all angiosperms
endosperm
A tissue, containing stored food, that develops from the union of a male nucleus and the polar nuclei of the central cell; it is digested by the growing sporophyte either before or after maturation of the seed; found ONLY in angiosperms
Suspensor
A structure at the base of the embryo in many vascular plants. In some plants, it pushes the embryo into nutrient rich tissue of the female gametophyte.
Aleurone
A proteinaceous material, usually in the form of small granules, occurring n the outermost cell layer of the endosperm of wheat and other grains
Epigeous
Type of seed germination in which the cotyledons are carried above ground level
Hypogeous
Type of seed germination in which the cotyledons remain underground
Meristem
Embryonic tissue regions, primarily concerned with formation of new cells
Primary Tissues
Cells derived from the apical meristems and primary meristematic tissues of root and shoot; as apposed to secondary tissues derived from cambium; primary growth results in an increase in length.
Epidermis
The outermost layer of cells of the leaf and of young stems and roots; primary in orgin
Ground tissue
Tissues other than the vascular tissues, the epidermis, and the periderm; also called fundemental tissue;
Vascular Tissue
Pertains to any plant tissue that consists of giving rise to conducting tissue; xylem, phloem, vascular cambium
Leaf primordial
A lateral outgrowth from the apical meristem that will eventually become a leaf
Lateral meristem
Meristems that give rise to secondary tissues; the vascular cambium and cork cambium
Root cap
A thimblelike mass of cells that covers and protects the growing tip of a root
Parenchyma Cells
ground tissue; living, generally thin-walled cells of variable size and forum; the most abundant kind of cells in plants
Collenchyma Cells
ground tissue, supporting tissue, elongated living cell with unevenly thickened, nonlignified primary cell wall
Sclereids
Ground tissue; thick, lignified secondary wall having many pits. Are variable in form but typically are not very long; they may or may not be living at maturity.
Xylem
Vascular tissue: most of the water and minerals are conducted through it; characterized by presence of tracheary elements
Tracheids
Vascular tissue; an elongated, thick-walled conducting and supporting cell of xylem. it has tapering ends and pitted walls without perforations, as contrasted with a vessel element. Found in nearly all vascular plants.
Vessel Elements
Vascular tissue; one of the cells composing of a vessel; also called a vessel member
Vessel
A tubelike structure of the xylem composed of elongate cells (vessel elements) placed end to end and connected by perforations. It's function is to conduct water and minerals through the plant body. Found in nearly all angiosperms and a few other vascular plants.
Phloem
vascular tissue; the food conducting tissue of vasular plants, which is composed of sieve elements, various kinds of parenchyma cells, fibers, and sclereids.
Sieve Tube Elements
One of the component cells of a sieve tube; found primarily in flowering plants and typically associated with a companion cell; also called Sieve tube member
Companion Cells
A specialized parenchyma cell associated with sieve tube element in angiosperm phloem and arising from the same mother cell as the sieve-tube element
Sieve Tubes
A series of sieve tube elements arranged end to end and interconnected by sieve plates
Quiescent Center
The relatively inactive initial region in the apical meristem of a root
Endodermis
A single layer of cells forming a sheath around the vascular region in roots and some stems; the endodermal cells are characterized by a Casparian strip within radial and transverse walls. In roots and stems of seed plants, the endodermis is innermost layer of the cortex
Pericycle
A tissue characteristic of roots that is bound externally by the endodermis and internally by the phloem
Lateral Roots
A root that arises from another, older root; also called a branch root, or secondary root, if the older root is the primary root
Node
THe part of a stem where one or more leaves are attached
Internode
The region of a stem between two sucessive nodes
Lateral Bud
?
Leaf Primoridum
A lateral outgrowth from the apical meristem that will eventually become a leaf *Formed when the plane of cell division in the inner tunica layer shifts from anticlinal to periclinal
Phytomeres
Leaf, node, internode, and axillary bude
Anticlinal
Perpendicular to the surace
Periclinal
Parallel to the surface
Petiole
The stalk of a leaf
Blade
The broad expanded part of the leaf, the lamina
Midrib
Cuts through the center of the leaf (backbone)
Lateral veins
Veins in the blade
Simple Leaves
An undivided leaf; as opposed to a compound leaf
Compound Leaves
A leaf whose blade is divided into several distinct leaves
Mesophyll
The ground tissues (parenchyma) of a leaf, located between the layers of the epidermis; mesophyll cells generally contain chloroplasts
Palisade Parenchyma
A leaf tissue composed of columnar chloroplast bearing parenchyma cells with their long axes and right angles to the leaf of the surface
Spongy Parenchyma
A leaf tissue composed of loosely arranged, chloroplast-bearing cells
Guard Cells
?
Stomates (Stomata)
A minute opening, bordered by guard cells, in the epidermis of leaves and stems through which gases pass; also used to refer to the entire stomatal apparatus - the guard cells plus their included pore. Lower epidermis, CO2 uptake and water release.
Secondary Growth
In plants, growth derived from secondary or lateral meristems, the vascular cambium and cork cambium; secondary growth results in an increase in girth, and is contrasted with primary growth, which results in an increase in length
Primary Growth
growth originating in the apical meristems of shoots and roots, as contrasted with secondary growth
Annual Plants
A plant whose life cyle is completed in a single growing season
Biennial Plant
A plant that normally reqauires two growing seasons to complete its life cycle; flowering and fruiting in its second year
Perennial Plants
A plant in which the vegetative structures live year after year
Vascular cambium
A cylindrical sheath of meristematic cells, the division of which produces secondary phloem and secondary xylem.
Periderm
Outer protective tissue that replaces epidermis which it is destroyed during secondary growth, includes cork, cork cambium, and phelloderm
Cork Cambium
The lateral meristem that forms the periderm, producing cork (phellem) toward the surface (outside) of the plant and phelloderm toward the inside; common in stems and roots of gymnosperms and woody angiosperms.
Cork
A secondary tissue produced by a cork cambium; made up of polygonal cells, non living at maturity; with suberized cell walls, which are resistant to the passage of gases and water vapor; the outer part of the periderm
Wood
Secondary Xylem
Bark
A nontechnical term applied to all the tissues outside the vascular cambium in a woody stem
Rays: Initial
An initial in the vascular cambium that gives rise to the ray cells of the secondary xylem and phloem
Secondary xylem
Produced by the vascular cambium and cork cambium
Secondary Phloem
Produced by vascular and cork cambiums
Early Wood
The first formed wood of a growth increment; it contains larger cells and is less dense than the subsequently formed late wood. Replaces "spring wood"
Late Wood
The last part of the growth increment formed in the growing season, it contains smaller cells and is denser than the early wood; replaces "summer wood"
Annual Rings
In wood, the growth layer formed during a single year
Inflorescence
A flower cluster with a definite arrangement of flowers
Perfect Flowers
A flower having both stamens and carpels; hermaphroditic
Imperfect Flowers
A flower lacking either stamen or carpels
Monoecious
Having the anthers and carpels produced in separate flowers in the same individuals
Dioecious
Unisexual; having the male and female (staminate and ovulate) elements on different individuals of the same species
Inferior Ovary (inferior flower)
An ovary that is completely or partially attached to the calx; the other floral whorls appear to arise from the ovary's top
Superior Ovary (superior flower)
An ovary that is free and separate from the calyx
Radial Symmetry
Can be divided into two equal halves in more than one longitudinal direction, also called regular
Bilateral Symmetry
Capable of being divided into two symmetrical halves only by a single longitudinal plane passing through the axis
Simple Fruit
A fruit derived from one carpel or several united carpels, (ex. apple)
Multiple Fruits
A cluster of mature ovaries produced by a cluster of flowers (ex. pineapple)
Aggregate Fruits
A fruit developing from the several separate carpels of a single flower
Stolon
A horizontal stem (may be above or below ground) that terminates in a bud, for vegetative production
Succulents
Plants with fleshly leaves or stems that are modified for water storage
Insectivorous Plants
Trap insects for Nitrogen, the traps are modified leaves