Cell wall function

 TOPIC# CELL WALL 

 

1)CELL WALL

INTRODUCTION

                              It is type of organelles present in plants,bacteria and some type of fungi but totally absent in Animals.For the first time cell wall was discovered by robert hook in plant cell in 1665 earlier than protoplast.

DEFINITION

                     It is the outermost permeable and protective layer of plants,fungi and bacteria.

PLANTS cell wall is made up cellulose(carbohydrates)

FUNGI cell wall made up of chitin similar to cellulose but having amino group(NH2)

BACTERIA cell wall is made up murien also called as peptidoglycan made up of aminoacids and sugars. 

basically cell wall is secreated by protoplasm of the cell.

FORMATION OF CELL WALL

                                                     cell wall is formed by golgi bodies of the cell.

TYPES OF CELL WALL

                                        There are three types of cell wall

1)PRIMARY CELL WALL

                                            It is the first and important wall of cell wall.In many plants cells only this wall is present.in some cells it is formed during extension of the cell.

its size is about 1-3 micrometer 

it is made up of cellulose,hemicellulose,polysaccarides(non cellulosic),pectin mostly calcium pectate.

In this wall no salts are present and having no lignin(important point).

It is crystalline and optically active but less than secondary wall.

2)MIDDLE LAMELLA

                                       This wall is present between different cells of plant tissue it is actually cementing substance which play role in holding cells of tissues.

its size is about 1 micrometer.

it is mostly present in woody plants.

it is also called as pecticied wall.

in it calcium pectate and lignin is present and important point is its having calcium salts.

3)SECONDARY CELL WALL

                                                   it is nearest to cell membrane and it is present in only some species of plants.

its size is about 5-10 micrometer.

it have cellulose ,polysaccarides(non cellulosic),no pectin and having salts of ca and mg(divalent ions) and potassium and silicon.

This wall is more crystalline and optically active.

Waris khan

MCQ POINT

the walls sequence from inside to outside of cell.

secondary>primary>middle lamellae

 USAGE OF CELL WALL IN INDUSTRIES

1-Cellulose(textile fiber)

2-nitrocelluse(explosives)

3-Rayan

4-Paper making

5-Cellulophane and chemotography

IMPORTANT MCQS IN THIS TOPIC 

1-The plants cell wall is made up of:

Answer: CELLULOSE

2-The fungi cell wall is made up of: 

Answer:  CHITIN

3-The bacteria cell wall is made up of : 

Answer:  MUREIN

4-The size of primary cell wall:  

Answer:  1-3MICROMETER

5-The size of secondary cell wall: 

Answer:  5-10micrometer

6-Which wall act as cementing substance: 

Answer: MIDDLE LAMELLAE

7-Which wall is more crystalline and optically active:

Answer:  SECONDARY CELLWALL

8-Lignin is found to be absent in:  

Answer:    PRIMARYCELLWALL

9-Cell wall is discovered by : 

Answer: ROBERT HOOKE

10-which wall have amino group: 

Answer:  CHITIN

11-The cell wall is formed by :

Answer: GOLGI BODIES

12-The cell wall is secreted by:

Answer:  PROTOPLASM

13-The outer most wall is: 

Answer: PRIMARYCELLWALL

14-Which one is explosives:

Answer:  NITROCELLOLUSE

15-Cell wall is selective or freely permeable: 

Answer: FREELY

16-Cell wall is rigid or flexible:  

Ansswer:  RIGID

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