Changes

= Concept Map =

= Concept Map =

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<mm>[[Plant tissues.mm|Flash]]</mm>

[[File:Plant tissues.mm|Flash]]

= Textbook =

= Textbook =

===Activities===

===Activities===

#Activity No #1 [[Plant_tissues_Meristematic_tissue_activity1]]

#Activity No #1 [[Plant_tissues_Meristematic_tissue_activity1]]

#Activity No #2 '''page_name_concept_name_activity2'''

#Activity No #2 ''concept_name_Activity_no''

==Concept #2-Permanent tissues-Simple permanent tissues==

==Concept #2-Permanent tissues-Simple permanent tissues==

Cells formed by meristematic tissue take up a specific role and lose the ability to divide. As a result,they form a permanent tissue. This processof taking up a permanent shape,size and function is called differentiation. Cells of meristematic tissue differentiate to form different types of permanent tissue.<br>

Cells formed by meristematic tissue take up a specific role and lose the ability to divide. As a result,they form a permanent tissue. This processof taking up a permanent shape,size and function is called differentiation. Cells of meristematic tissue differentiate to form different types of permanent tissue.<br>

Parenchyma, in plants, tissue typically composed of living cells that are thin-walled, unspecialized in structure, and therefore adaptable, with differentiation, to various functions. Parenchyma may be compact or have extensive spaces between the cells. It is often called ground, or fundamental, tissue and makes up the mesophyll (internal layers) of leaves and the cortex (outer layers) and pith (innermost layers) of stems and roots; it also forms the soft tissues of fruits. Cells of this type are also contained in xylem and phloem as transfer cells and, with both xylem and phloem as bundle sheaths, the cells that surround the vascular strands.<br>

Parenchyma, in plants, tissue typically composed of living cells that are thin-walled, unspecialized in structure, and therefore adaptable, with differentiation, to various functions. Parenchyma may be compact or have extensive spaces between the cells. It is often called ground, or fundamental, tissue and makes up the mesophyll (internal layers) of leaves and the cortex (outer layers) and pith (innermost layers) of stems and roots; it also forms the soft tissues of fruits. Cells of this type are also contained in xylem and phloem as transfer cells and, with both xylem and phloem as bundle sheaths, the cells that surround the vascular strands.<br>

[[File:parenchyma.jpg|300px]]

[[File:parenchyma.jpg|250px]]

'''Parenchyma tissue'''

'''Parenchyma tissue'''

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>

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

[[File:collenchyma1.jpeg|300px]]

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

[[File:collenchyma.jpg|300px]]

'''SCLERENCHYMA''':<br>

'''SCLERENCHYMA''':<br>

There are certain cells closely associated with sieve tube,called '''companion cells'''.They regulate the passage of food through sieve tubes. Except for phloem fibres, phloem cells are living cells.<br>

There are certain cells closely associated with sieve tube,called '''companion cells'''.They regulate the passage of food through sieve tubes. Except for phloem fibres, phloem cells are living cells.<br>

[[File:structure_phloem.gif|200px]]

[[File:structure_phloem.gif|300px]]

'''Phloem tissue'''

'''Phloem tissue'''

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

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

'''Figure showing arrangement of vascular bundles in a stem'''

'''Figure showing arrangement of vascular bundles in a corn stem'''

===Activities===

===Activities===