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Hi friends, in this video let us
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understand the different plant tissue
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systems. Once we have a section under
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the microscope like this. So this is a
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section of a monocode stem. The plant
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tissue systems are the first one is the
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epidermal tissue system which forms the
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outer protective layer as you see here.
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Then there is ground tissue system. All
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tissues other than epidermal and
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vascular tissues this region. And the
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third tissue system is the vascular
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tissue system that is involved in
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conduction of food and water that is
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sylum and fo. So this is the vascular
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tissue system. Now let us see the
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details. The first one is the epidermic
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tissue system which forms the outer
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protective layer. So this is epidermal
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tissue system. Once we zoomed in we can
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see like this. Here you can see this
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epidermal tissue system. Above that
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there is a cuticle a waxy coating that
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helps in reducing water loss by
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transpiration. Then there are tricoms
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and lower epidermis there is tomato that
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is meant for gaseous exchange. Epidermal
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tissue system is outermost protective
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layer covering all external surfaces of
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plants that is leaves stem root etc. The
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main components are epidermis that is
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made up of single layer of compactly
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arranged cells without intracellular
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spaces primarily parangama cells. Above
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this epidermis there is a waxi layer
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which is made up of cutin often covers
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the aerial parts to minimize water loss
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and to protect mechanical injuries. Then
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there are stomata. They are small pores
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that are guarded by two kidney-shaped
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guard cells that helps in case exchange.
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Tricoms may be there as we mentioned
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there are hairike outgrowths on leaves
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and stems. Sometimes the function may be
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preventing hairpa or act as a repellent
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reflects light or reduce evaporation.
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Then there are some special
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modifications like tissue in orchids as
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you see this is a wamament tissue that
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absorbs atmospheric moisture. Then there
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are bully form cells. So this is a bully
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form cells. Enlarge cells in grasses
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that helps in leaf folding to reduce
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water loss when the temperature is high.
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So this is about the epidmal tissue
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system. Now moving to the next tissue
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system which is a ground tissue system.
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So this is a ground tissue system.
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Ground tissue system comprises of all
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tissues excluding epidermal and vascular
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tissues that forms majority of plant's
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body. The major components are
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paragamata cells as you see here that is
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a lightly stained loosely packed thin
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wall cells that is involved in
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photosynthesis. Then it is called as
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chloranka storage and healing. In the
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last video we discussed about different
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types of plant tissues. You can refer
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that for more. Then this is a parang
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cells. Then colona is present that
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provides flexible support especially in
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stems and ples that is seen just below
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the epiderms. Scaranga may be present.
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As you see here, there are thick wall
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lignified cells that provides rigidity
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and strength. Hypodermis is made up of
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either colanga or scaranga that provides
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mechanical support. This region is a
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hypodermis just below the epidermis. And
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cortex region is made up of primarily
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parang cells. Function is storage. Then
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the innermost ccotical layer in the case
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of vot stem controls flow of substances
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into vascular tissues. There may be
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Then perisycle there is a thin sound
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just inside and armis that is important
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for root formation or root branching. In
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the case of stem there is a central pit
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a prominent region that is made up of
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paranga cells present in stems. The
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third type of tissue is a vascular
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tissue system which is asylum and flow
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up. So this is arranged as vascular
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bundles in monocode stem. As you see
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here this is a sylum and this is a
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phium. You can refer our previous video
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for more. The components of the vascular
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tissue system is connective tissue that
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is composed of sylum for water transport
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whereas phium for food transport or
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The major components are asylum that
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includes tracheets, vessels, hypers,
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parangma cells that helps in moving
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water and minerals upward and also
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provide mechanical support that is
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provided by silo fibers.
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So this is as you see here this is a
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phium that is made up of seat tubes,
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companion cells, fibers and parangma
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cells that transports organic food in
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upward and downward directions. The
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distribution it is often arranged in
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strands or bundles throughout root, stem
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and leaf. Let me summarize. The first
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tissue system is epidermal tissue system
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that forms the outermost protective
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layer with cuticle or tricom. Sometimes
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there may be valamin tissue or
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polyiforform cells. These are some
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specialized structures. Then there is
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crown tissue. Everything other than this
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epidermal tissue system and vascular
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tissues construed crown tissue system
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which is primarily made up of parang
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cells. as you see here involved in
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storage and the third tissue system is a
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wasar tissue system that is involved in
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conduction of food and water that
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consists of both sylum and phium. This
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is arranged as wasclarabundantil and
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this is asylum and this is the phium.
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Sylm involved in conducting water to
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upward regions of the plant whereas
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phium is involved in transferring
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photosynthets to different parts of the
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plant. Hope you are clear with plant
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tissue systems. Take care stay blessed.
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Thank you so much. You have a biology
