Science - Complex Permanent Tissues in Plants – Tissues Part 4 – English Video Lecture - Class 9

good morning everyone we already know
about permanent tissues which are
derived from the meristematic tissues
once they lose the ability to divide
also that broadly the permanent tissues
in plants are of two types
simple permanent tissues and complex
permanent tissues simple permanent
tissues are made of one type of cells
which look like each other so what
exactly are complex permanent tissue let
us see now there are other permanent
tissues which are made of different
types of cells they together perform a
specific task hence they are counted
under one tissue these are called
complex permanent tissues
so remember complex permanent tissues
are made of more than one type of cells
and these cells coordinate to perform a
specific task
xylem and phloem are the examples of
such complex tissues we already know
xylem carries water and minerals
absorbed by the roots upward to
different parts of the plants
specifically the leaves and phloem
transports the food produced during
photosynthesis from the leaves to the
different parts of the plant so flow of
care is both in upward and downward
direction both of these tissues status
xylem and phloem are conducting tissues
and constitute a vascular bundle now
coming to the structure of cells xylem
is made of four kinds of cells these are
tracheids vessels xylem parenchyma and
xylem fibre these cells have thick walls
tracheids vessels and xylem fibers
consist of dead cells only xylem
parenchyma cells are living cells
designed parenchyma stores food and
helps in sideways conduction of water
jackets and vessels are tubular
structures this allows them to transport
water and minerals vertically remember a
vessel is also known as track here the
plural of track here is
trucky ie xylem fibers are mainly
supportive in function and what about
phloem phloem is also made up of four
types of cells sieve tubes companion
cells phloem fibers and phloem
parenchyma sieve tubes are tubular
structures with perforated balls amongst
these only phloem fibers is made of dead
cells the rest that is seat tube cells
companion cells and phloem parenchyma
asked living cells so now you know
broadly the permanent tissues in the
plants are of two types
simple permanent tissue and complex
permanent tissue the simple permanent
tissues are made of only one type of
cells which look like each other where
is complex permanent tissues are made of
more than one type of cells these cells
coordinate with each other to perform a
common function the simple permanent
tissues are of three types parenchyma :
kima and sclerenchyma the complex
permanent tissue consists of xylem and
phloem and these consist of different
types of cells hence they are called
complex permanent tissues xylem consists
of four different types of cells these
are tracheids vessels that is tracky
xylem parenchyma and xylem fibers of
these only xylem parenchyma consists of
living cells fluid which is another type
of complex permanent tissue also has
four types of cells see tubes companion
cells phloem fibers and phloem
parenchyma all of these are living cells
except for phloem fibers so that was all
about tissues in the plants in the next
class we shall study about the animal
tissues till then bye bye