lab 6. tissues- a group of cells functioning together in some specialized activity
TRANSCRIPT
Plant tissues
Lab 6
102 Bot
TISSUES- a group of cells functioning together in some specialized activity
Tissues
Plant Tissues Types
All plant organs (roots, stems, leaves) are composed of the same tissue types.
Classification of Plant Tissues
PARENCHYMA - البرانشيمية األنسجة
COLLENCHYMA - الكولنشيمية األنسجة
SCLERENCHYMA - السكالرنشيمية األنسجة
XYLEM الخشب
PHLOEM اللحاء
Plant Cell and Tissue Types
2 .Permanent or mature tissue1 .Meristematic tissue
Meristematic tissue
Meristematic tissueShoot
Root
2 .Permanent or mature tissue
PARENCHYMACharacteristics
least specialized cell typeonly thin primary cell wall is presentpossess large central vacuolegenerally alive at functional maturityThis tissue is found in the soft parts of the plant like the cortex(outer region) and pith (inner region) of the roots and stems.
Functionsmake up most of the ground tissues of the plantstoragephotosynthesiscan help repair and replace damaged organs by proliferation and specialization into other cells
Equal diameters parenchyma
Parenchyma
Ribbed
aerenchyma
Parenchyma
Chlorenchyma
Water storage parenchymafood storage parenchyma
CollenchymaCharacteristics
possess thicker primary cell walls the that of parenchymano secondary cell wall presentgenerally alive at functional maturity
Functionsprovide support without restraining growth
Types of collenchyma
Angular collenchyma- 1زاوي
Lamellar (lamellate) collenchyma- 2صفائحي
Lacunar (lacunate)- 3 فراغيcollenchyma
SclerenchymaCharacteristicshave secondary cell walls strengthened by ligninoften are dead at functional maturitytwo forms: fibers and sclereidsFunctionsrigid cells providing support and strength to tissues
Sclerenchyma
1 -fiber 2-sclereids -stone cells
1-Fibres
2-Sclereids
bone shapedstar shapedoval in shape
عصوية حجرية خالياBacillary
C o m p l e x P e r m a n e n t T i s s u e s
Xylem and Phloem
Xylem
They are four basic elements in Xylem :
Xylem tracheids
Xylem tracheae or vessels
Xylem fibers
Xylem parenchyma
الخشب في التغلظات أنواعحلزوني
Spiral حلقيannular
منقرpitted
شبكيreticulate
Phloem is a heterogenous tissue, made up of four different types of cellular elements, namely,
Sieve tubes
Companion cells
Phloem parenchyma
Phloem fibres
Phloem
Phloem parenchyma
Munira Al-Dosari