Changes

The flexibility in plants is due to another permanent tissue, collenchyma. It allows easy bending in various parts of a plant (leaf,stem,petiole) without breaking. It also provides mechanical support to plants. We can find this tissue in leaf stalks below the epidermis.The cells of this tissue are living, elongated and irregularly thickened at the corners. There is very little intercellular space.The cell wall is made up of cellulose and pectin.<br>

The flexibility in plants is due to another permanent tissue, collenchyma. It allows easy bending in various parts of a plant (leaf,stem,petiole) without breaking. It also provides mechanical support to plants. We can find this tissue in leaf stalks below the epidermis.The cells of this tissue are living, elongated and irregularly thickened at the corners. There is very little intercellular space.The cell wall is made up of cellulose and pectin.<br>

http://everythingscience.co.za/lifesciences/grade-10/04-plant-and-animal-tissues/images/6d29e2ef912af90a6d0451f417787577.png

[[File:collenchyma1.jpeg|400px]]

http://images.tutorvista.com/content/tissues-plants-animals/collenchyma-cells.jpeg

[[File:collenchyma.jpg|400px]]

'''SCLERENCHYMA''':<br>

'''SCLERENCHYMA''':<br>

'''Sclerieds''' are hard cells having more lignin.Hence they are commonly called '''stone cells'''.They are generally found in fruit wall and seed coats.

'''Sclerieds''' are hard cells having more lignin.Hence they are commonly called '''stone cells'''.They are generally found in fruit wall and seed coats.

[[File:Sclerenchyma.JPG|300px]]

[[File:Sclerenchyma.JPG|350px]]

http://www.tantebazar.com/imgx/simple_plant_tissues.jpg

[[File:simple_plant_tissues.jpg|350px]]

'''Figure showing differences between parenchyma,collenchyma and sclerenchyma tissue'''

'''Figure showing differences between parenchyma,collenchyma and sclerenchyma tissue'''

In some plants like desert plants,cabbage,banana etc. epidermis has a thick waxy coating of '''cutin''' on its outer surface to prevent water loss.<br>

In some plants like desert plants,cabbage,banana etc. epidermis has a thick waxy coating of '''cutin''' on its outer surface to prevent water loss.<br>

http://www.bbc.co.uk/schools/gcsebitesize/science/images/bi05004.gif

[[File:epidermis.gif|400px]]

'''Cross section of a leaf showing epidermis'''

'''Cross section of a leaf showing epidermis'''