TISSUES Flashcards
A group of closely associated cells that perform related functions and are similar in structure.
Tissues
properties of plant tissues
- most are dead tissues
- cells of some tissues are alive
- has continuously dividing cells
Plant tissues can be classified as:
meristematic
permanent
Composed of actively dividing cells, responsible for the production of cells.
meristematic tissues
Capacity for division is restricted to certain parts of the plant body called
meristems
These tissues are present in the tips of stems and roots. They help in the growth of stems and roots.
apical meristematic tissue
These tissues are present in in the sides of stems and roots. For ex- Cambium in stem and root. They help to increase the girth of the stems and roots
lateral meristematic tissues
These are present at the base of leaves and internodes. These help in growth of branches and leaves.
intercalary meristematic tissues
Tissues that attained their mature form and perform pacific functions.
permanent tissues
types of permanent tissues
simple
complex
consist onolyfonekindofcells
simple permanent tissue
- external tissues
- forms protective covering of the plant body
dermal or surface tissue
types of surface tissue
epidermis
peridermal
- the outermost layer of the primary plant body
- covers the leaves, floral parts, fruits, seeds, stems and roots
epidermis
pores for gas exchange
stomata
- Lines the outer wall of the epidermal cells
- made up of waxy material that protects plants from desiccation
cuticle
- outgrowths of epidermal cells
trichomes
is the outermost layer ofstems and roots of woody plants such as trees.
periderm (bark)
cells are rounded in shape &have uniformly thin walls found in all parts of the plants.
parenchyma
functions of parenchyma
basic metabolic function
storage
wound healing and regeneration
having the ability ot divide into a number of diferent cels.
pluripotent
A specialized parenchyma tissue found in the green parts fo the shoot and performs photosynthesis.
chlorenchyma
chlorenchyma functions
support and elasticity
segeneration
are non-living and lack protoplasts at maturity
provide strength and support in parts that have ceasedelongatingormature
sclerenchyma