Biology Of Trees Flashcards
(140 cards)
Abscission zone is
Found at the base or the leaf stalk, or petiole.
Serves two functions:
1: enables leaf drop
2: protects the region of the stem from pathogen.
Epicormic
Then dormant buds elongate and produce shoots, these shoots are called epicormic.
Adventitious buds are
Are produced along the stems or roots where primary meristems are not normally found.
Node
A slightly enlarged portion of a twig with leaf buds arise
Inter-node
Is the area between the nodes
Apical
Buds located at the end of the shoot or called apical
Ring porous
Trees that form wide vessels early in the growing season and now are vessels later in the season I called ring porous.
Ulmus
Quercus
Fraxinus
Diffuse porous
Trees the produce vessels in uniform size throughout the growing season.
Acer
Plantanus
Populus
Xylem has dead and live tissues
They are called
Symplasm is live
Apoplasm dead
Xylem of gymnosperms (pines) is composed of
Tracheids
Fibers
Parenchyma
Tracheids do what
Tracheids conduct water and provide mechanical support our elongated dead cells with pointy ends and second walls
Parenchyma cells do what
Parenchyma cells are living cells interspersed among the other xylem cells parenchyma cells are located in the outer layers of the xylem store carbohydrates help defend against decay and have a structural function across the green
meristems
The division of existing cells within a Tree occurs and specialized zones called meristems
Differentiation
Following division during the meristematic process, cells undergo differentiation which changes the structure and permits them to assume a variety of specific functions.
Two types of Meristems
Primary. Which produce cells that result in elongation of shoots and roots. (
Secondary. Known as lateral meristems which produce cells that result in increases in diameter
Meristematic growth happening in the shoots and root tips is called:
Primary growth
Meristems on the stem and branches is called
Presence of secondary meristems growing within the stands branches and roots producing wood are called: secondary growth
Two types of secondary or lateral meristems.
1: Cambium (produces vascular system/ xylem and phloem)
2: cork cambium produces bark (periderm)
Xylem has four functions:
1: conduction of water and dissolved minerals
2: supports tue weight of the tree
3: stores carbohydrate reserves
4: Defence against the spread of disease and a K
When cutting through a tree you cut in order
1: bark
Then
Bark Phloem Cambium Xylem Sapwood/heartwood
Anthocyanin and carotenoids are:
Red or purple pigment in deciduous trees. Anthocyanin
Yellow oranges and reds. Carotenoids
Root and root tip anatomy
Area where the roots join the main stem is called the root crown. Zone of rapid taper. Root hair Region of differentiation Region of elongation Meristematic zone Root cap
Amon-eye nut
A Specialize not used in keeping trees that has a large I for attaching a cable to a threaded rod
Angiosperm
A plant with seeds born with an Ovary consists of two large groups
Monocotyledons and dicotyledons.