Vascular system and plants
The three basic plant organs are roots, stems and leaves
They are organized into a root system and a shoot system
Roots rely on sugar produced by photosynthesis in the shoot system. Shoots rely on water.
Roots are multicellular organs with important functions
- anchor the plant, absorb minerals and water, and store organing nutrients.
A taproot system consists of one main vertical root that gives rise to lateral roots, or branched roots.
A stem is an alternating system of nodes. Each node contains internodes, which are stem segments between the nodes.
An axillary bud is a structure that has the potential to form a lateral shoot or branch.
An apical bud, or terminal bud, is located near the shoot tip and causes elongation of a young shoot.
- apical dominance helpts to maintain dormancy in most nonapical buds.
The leaf is the maing photosynthetic organ of most vascular plants.
- a leaf generally consists of a flattened blade and a stalk called the petiole, which joins the leaf to a node of the stem
- xylem and phloem
Alteration of Generations
Xylem Phloem
trachied (pit) steive tube
vessel element companion cell
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