Transcript STEMS

STEMS
TYPES OF STEMS 
1-Herbaceous- Annual plants -Vivacious 
plant
2-Ligneous-Trees –Shrubs - Bushes 
3-Under ground-Rhizomes –Tubers- Bulbs 
4-Succulent stem
Herbaceous
They do not have developed
ligneous stiffened structures they
are generally frail
Ligneous
They have developed rigid stiffened
structures .
Trees
Plants with ligneous stems ,with a
superior height of five meters.
Shrubs
Are those plants with ligneous stems
,from one to five tall .in this
,branching begins
case
at soil level
Bushes
Ligneous plant shorter than one
meter tall .
Succulent stem
They become very fat because of
water accumulation.
Annual plants
plant with a year lifetime .weeds
generally belong to this group .
Vivacious plant
Plant with aerial stems lasting a single
season ,but keeping underground
structures form which new stems spring
again next season .
-Under
Rhizomes
ground
Tubers
Bulbs
Function
Stems support the leaves ,flowers
and
fruits.
2-Stems transport water ,minerals
and sugars to leaves and root .
Adaptations of stems
1- adaptations of aerial stems
A_Photosynthetic
B_Succulent stems
C- Climbing-support
Tendril-Grape vine
2-Adaptations of Under ground stems
Storage ( Rhizome )
Gingiber(zingiber)
Storage-Corm
Crocus