BTNYLAST Flashcards
a group of cells performing essentially the
same functions and commonly the same structures
Tissues –
small, thin-walled, rapidly dividing cells with large
nuclei. No intercellular spaces, composed of
parenchyma cells.
A. – at the tip
B. – portion of apical that
have become separated from the apex
C. – They add to existing tissues,
increase the diameter
Embryonic or Meristematic Tissue (Growth Tissues) –
A. Terminal or apical meristem – at the tip
B. Intercalary meristems – portion of apical that
have become separated from the apex
C. Lateral Meristem – They add to existing tissues,
increase the diameter
General characteristics of Meristematic
very small cells with thin cell walls
* cells have large nuclei
* small vacuoles and lack
* intercellular spaces
* divide actively throughout the life of the plant
* tips of roots, stems, nodes of stems, buds
JUST READ
- tip of stems and roots.
- helps in.cellular enlargement
- influence the shapes of the mature plants.
Apical meristems :
- sides of roots and stems
- increasing the width or diameter of stems and roots.
Lateral meristems :
- bases of young leaves and internodes.
- lengthening of stems and leaves
Intercallary meristems
What kind of permanent tissue?
- they are composed of similar types of cells, which have common origin and function.
- composed of cells that are structurally and functionally alike
Simple permanent tissue:
What kind of permanent tissue?
composed of two or more types of cells but
contribute to a common function
Xylem and Phloem are ___ and are found in the
vascular bundles in the plants.
Complex permanent tissue:
These are differentiated and matured product of meristematic activity.
Permanent Tissues –
covering (stems, roots, leaves)
- epidermis (cuticle)
Functions: mechanical protection
: restriction of water loss
: for gaseous exchange
: Photosynthesis (guard cells)
Protective tissues –
Some cells differentiate:
___ – pores for gas exchange
____– leaf hairs, protect
against herbivores and damaging solar radiation
____ – increase root surface area
Some cells differentiate:
Stomata – pores for gas exchange
Trichomes – leaf hairs, protect
against herbivores and damaging solar radiation
Root hairs – increase root surface area
Epidermal cells of the shoot system
secrete a waxy __ that limits
water loss, reflects damaging solar
radiation, and form a barrier against
pathogens
cuticle
What kind of permanent tissue?
found in the soft parts of a
plant such as the roots, stem, leaves,
and flowers.
* the cells of this tissue are loosely packed
and contain large intercellular spaces
between them. Each cell has a vacuole at
the center.
* the functions of __ tissues are
storage, photosynthesis, and to help the
plant float on water.
has thin cell walls
Parenchyma–
What kind of permanent tissue?
____ similar to
parenchyma cells with
thicker cell walls.
provide mechanical support
to the plant structure in
parts such as petiole of
the leaf.
uneven thickening of cell wall
contains pectin and cellulose
Collenchyma-
What kind of permanent tissue?
____-tissue are dead, rigid,
contain thick and lignified secondary
walls.
to provide strength
and support to parts
of the plant.
even thickening of cell wall
- wall thickened with lignin
Sclerenchyma
