Plant Science Stems. Stems Stems Stems The main stem and branches are the scaffolding of The main...
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Transcript of Plant Science Stems. Stems Stems Stems The main stem and branches are the scaffolding of The main...
StemsStems StemsStems
The main stem and branches are the scaffolding of The main stem and branches are the scaffolding of the plant
Supports the leaves, flowers and fruits transport water, nutrients, sugars through capillary
action store food
Above ground stem typesAbove ground stem types Woody and HerbaceousWoody and Herbaceous
Woody stemsWoody stems Tough and winter hardy Tough and winter hardy Often have bark around themOften have bark around them
Herbaceous StemsHerbaceous Stems More succulentMore succulent Often green Often green Do not survive in cold climatesDo not survive in cold climates
Modified stemsModified stems Bulbs, corms, Bulbs, corms,
rhizomes and Tubersrhizomes and Tubers BulbsBulbs
Highly compressed Highly compressed underground stemsunderground stems
Have modified leaves Have modified leaves called scalescalled scales
RhizomesRhizomes Run just under the surfaceRun just under the surface A new plant will group where each node isA new plant will group where each node is
TubersTubers Thickened underground stems Thickened underground stems
that store carbohydratesthat store carbohydrates
Parts of the stemParts of the stem NodeNode InternodeInternode Axillary BudAxillary Bud AxilAxil LenticelsLenticels Terminal BudTerminal Bud Vegetative BudVegetative Bud Flowering BudFlowering Bud
NodeNode: swollen part of stem where : swollen part of stem where buds form (leaves or stems grow buds form (leaves or stems grow here)here)
InternodeInternode: stem tissue between : stem tissue between nodesnodes
Axillary bud – a bud formed Axillary bud – a bud formed in the axil of a leafin the axil of a leaf
Axil- the angle on the upper Axil- the angle on the upper side of the union of a branch side of the union of a branch and main stem of a leaf and and main stem of a leaf and stemstem
Lenticels – an opening made up of loosely Lenticels – an opening made up of loosely arranged cells in the stem to allow for arranged cells in the stem to allow for passage of gasespassage of gases
Terminal Bud – a Terminal Bud – a bud at the end of the bud at the end of the stemstem
Vegetative Bud – a Vegetative Bud – a terminal plant bud terminal plant bud that produces a stem that produces a stem and leaf growthand leaf growth
Flowering Bud - a Flowering Bud - a terminal plant bud terminal plant bud that produced a that produced a flowerflower
Internal parts of stemInternal parts of stem PhloemPhloem XylemXylem CambiumCambium PithPith CortexCortex
FunctionsFunctions Phloem-Sugar and Phloem-Sugar and
carbohydrates to rootscarbohydrates to roots Xylem- Water and nutrientsXylem- Water and nutrients Cambium- Growing part of Cambium- Growing part of
stemstem