Unit1 lesson2-cells

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UNIT 1 - Ch5-CELL STRUCTURE & FUNCTION P. 87-102

OBJECTIVES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CELL SHAPE ,[object Object],[object Object],[object Object],[object Object]

CELL SIZE ,[object Object],[object Object]

MOST CELLS ARE SMALL FOR TWO REASONS : ,[object Object],[object Object],[object Object],[object Object]

COMPARING CELLS ,[object Object],[object Object]

EUKARYOTIC vs PROKARYOTIC CELLS ,[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

PLANT VS ANIMAL CELLS ,[object Object],[object Object],[object Object],[object Object],[object Object]

UNIQUE FEATURES OF PLANT CELLS ,[object Object],[object Object]

CELL WALL - see fig 5-6 ,[object Object],[object Object],[object Object]

CELLS ORGANELLES ,[object Object],[object Object],[object Object],[object Object],[object Object]

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slide1- introduction slide2-Plant Tissue Plant tissues are of two types :- Meristematic tissue Permanent tissue slide3-Meristematic Tissue Meristematic tissues continuously form a number of new cells and helps in growth and are generally made up live cells . Meristematic tissues are the group of cells that have the ability to divide. These tissues in a plant consist of small, densely packed cells that can keep dividing to form new cells. Meristems give rise to permanent tissues and have the following characteristics: the cells are small, the cells walls are thin, cells have large nuclei, vacuoles are absent or very small there are no intercellular spaces. Types of Meristematic Tissue Apical Meristem:- Apical meristem is present on root apex, stem apex, leaf buds and flower buds. They are responsible for growth in length, i.e. primary growth. Lateral Meristem: Lateral meristem is present along the side of the stem. They are responsible for growth in girth, i.e. secondary growth. Intercalary Meristem: Intercalary meristem is present at the base of leaf or internodes. They are present on either side of the node. slide4-Permanent Tissue [Plant Tissue] Once the cells of meristematic tissue divide to a certain extent, they become specialized for a particular function. This process is called differentiation. Once differentiation is accomplished, the cells lose their capability to divide and the tissue becomes permanent tissue. Permanent tissues are of two types, simple permanent tissue and complex permanent tissue. Permanent tissue gives support and are generally made up of dead cells . The cells of permanent tissues do not have the ability to divide. These cells are already differentiated in different tissue types and is now specialized to perform specific functions. They are subdivided into two groups, simple tissues consisting of cells which are more or less similar, e.g. epidermis, parenchyma, chlorenchyma, collenchyma, sclerenchyma and complex tissues consisting of different kinds of cells, e.g. xylem and phloem. slide5-Parenchyma tissue The cells of parenchyma have thin cell wall. They are loosely packed; with lot of intercellular spaces between them. Parenchyma makes the largest portion of a plant body. Parenchyma mainly works are packing material in plant parts. The main function of parenchyma is to provide support and to store food. It is loosely packed and inter cellular spaces are there . In aquatic plants , air is filled in parenchyma tissue , so they are called Arenchyma . Parenchyma in which chlorophyll is present is called chlorenchyma . slide6- Collenchyma tissue In collenchyma tissue , the cells are generally elongated and are circular , oval or polygonal in cross- section. Cell wall is evenly thickened with cellulose at the corners . It is present on internodes of the plant . It is closely packed and intercellular spaces are generally absent. It is a living cell and vacuo

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