Tissue Blog 4



Hello Learners,

In the previous blog, we have discussed about simple permanent tissues. We learned about the structure, location and function of Parenchyma, Collenchyma and sclerenchyma. We have also learned about the diversity of epidermis of leaves.

 Today, we will discuss more about Complex Permanent Tissue of PLANT TISSUES.

At the end of today's topic, learners will be able to 
(i) define complex permanent tissue.
(ii) explain the importance of complex permanent tissue in the plant body.
(iii) tell the location of complex permanent tissue in the plant body.
(iv) draw the location of complex permanent tissue in the plant body.

 Important Instruction: Today, we will be completing the topic PLANT TISSUE. Kindly prepare well for google assessment scheduled as per information given below:

 Date:  02.05.2020, Saturday, Day 5 Period 7
Time 20 minutes

 There will be regular class in period 6.

 So, let us start the topic.....

 Revisit this link: https://www.youtube.com/watch?v=xSYLJIR6cGY

                                  COMPLEX PERMANENT TISSUE

Tissue which are made up of more than one type of cells are called complex permanent tissues. All these cells coordinate to perform a common function and constitute the vascular bundles. This tissue helps in conduction and is of two types- Xylem and Pholem.

    


    (1)Xylem- Xylem helps in the conduction of water and minerals. It is made up of tracheids, vessels, xylem fibre and xylem parenchyma.
    
   (2)Phloem- Phloem helps in the conduction of food. It is made up of four types of constituents of sieve tubes, companion cells, phloem fibres and phloem parenchyma.

  Xylem
https://www.youtube.com/watch?v=41CfMlpaRCQ


(I)          Tracheids

Structure
Elongated cells with pointed ends
No nucleus and cytoplasm at maturity
Walls are thickened by the deposition of lignin, except certain points called pits
    Function: Conduction of water and minerals/ mechanical support.


(II)        Vessels
Structure
          Elongated with blunt ends
          No nucleus and cytoplasm at maturity.
          Walls are lignified but perforation at their end walls.
          Each vessel is made up of a series of cells where each cell is called vessel member.
       Function: Conduction of water and minerals/ mechanical support.

(III)      Xylem fibre
These are sclerenchymatous fibres with pointed ends, thick walls and narrow lumen
Function: mechanical support

(IV)      Xylem parenchyma
These are thin walled living cells
Functions: store food/ lateral conduction of water


Phloem

  https://www.youtube.com/watch?v=41CfMlpaRCQ


(I)          Sieve tubes
Like vessels, sieve tube is also made up of many cells where each cells is called sieve tube element.
Having living cytoplasm without nucleus at maturity.
End walls are called sieve plates and these plates and these plates have perforations called sieve pores.
Found in angiosperms only.

Function: Conduction of food

(II)        Companion cells
They are long, narrow, thin walled, nucleated cells associated with sieve tube elements.

Function: They control their own activity of sieve tube elements.


(III)      Phloem fibres
These are sclerenchymatous fibres with pointed ends.
Thick walled fibres with narrow lumen.

Function: Mechanical support

(IV)      Phloem parenchyma
These are thin walled living cells.
Absent in monocot.

Function: Storage of food



Difference between xylem and phloem

https://www.youtube.com/watch?v=41CfMlpaRCQ


Xylem
Phloem
     1.   It is water and minerals conducting plant tissue.
     2.   It contain only one type of living cells, namely xylem parenchyma cells.
    3.   There are two types of conducting elements, tracheid and vessels.
    
     4.   Conducting elements are dead and empty.
    
    5.   Vessels are without septa.
     1.   It is food conducting plant tissue.
    2.   Phloem contains three types of living cells, namely, sieve tube cells, companion cells and phloem parenchyma cells.
    3.   Only one type of conducting elements are present, namely sieve tubes.
    4.   Conducting elements are living cells.
    5.   Sieve tubes have porous septa called sieve plates.


Recapitulation :  https://www.youtube.com/watch?v=41CfMlpaRCQ

 Home Assignment
1. Complete the notes.
2. Draw fig 6.7 in your biology note book.

Comments

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