INTRODUCTION
TO PLANT CELLS AND TISSUE
The plant body is composed of individual cells
that are organized into aggregates of cell called tissues. Simple tissues are
made up of a single type, whereas complex tissues contains a variety of cell
types. Tissues may function as structural supports, protective coverings, or
transporters of water and nutrients.
The main tissues of plants may be grouped into
three systems which are ground tissue system, vascular tissue system and dermal
tissue system.
LETS FOCUS ON GROUND TISSUE!!
The ground tissue system is the most extensive, at least in
leaves and young green stems that consist of a parenchyma, collenchyma and
sclerenchyma.
Parenchyma is spherical and elongated, it has
thin and flexible cell wall the most abundant cell. Parenchyma is the most
abundant cell and it can form organ like leaves, root and stem. It contain
starch grain, food reserve and a large vacuole.
notes: in celery and tomato cell there are example of parenchyma cell
Collenchyma is elongated cell with irregularly
thick cell wall, the cell wall contain cellulose and pectin .Collenchyma
usually found under epidermis. Collenchyma is one of the important cell in
plant because it provide support for growing and mature organ such as leaves
and floral part.
Sclerenchyma consist of cell that have thick and
tough secondary cell wall impregnated with lignin.
The observed pear under the microscope we able to
identify types of sclereids which is brachysclereids or the stone cells.
notes: in celery and tomato cell there are example of parenchyma cell
Collenchyma is elongated cell with irregularly thick cell wall, the cell wall contain cellulose and pectin .Collenchyma usually found under epidermis. Collenchyma is one of the important cell in plant because it provide support for growing and mature organ such as leaves and floral part.
The observed pear under the microscope we able to identify types of sclereids which is brachysclereids or the stone cells.
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