Plant tissues handwritten notes

12TH PHYSICS

Tissues and other levels of organisation
Cell is the fundamental structural and functional unit of organism and that bodies of organisms are made up of cells of Warriors shapes and sizes groups of similar cells aggregate to collectively perform a particular function such groups of cells are termed tissues

Tissues and other levels of organisation
Cell is the fundamental structural and functional unit of organism and that bodies of organisms are made up of cells of Warriors shapes and sizes groups of similar cells aggregate to collectively perform a particular function such groups of cells are termed tissues
What is a tissue
Organs such as stem and roots and plants and stomach heart and lungs in animals are made up of different kind of tissues a tissue is a group of cells with a common origin structure and function their common origin means they are derived from the same layer of cells in the embryo being of a common origin there are similar in structure and hence perform the same function several types of tissues organised to form an organ
Example bone and cartilage are some examples of animal tissues whereas parenchyma collenchyma xylem and phloem are different tissues present in the plants the study of tissues is called Histology a group of cells with similar origin structure and function is called tissue example bone and muscle in animals and marriage time in tips of root and shoot in plants
The plant tissues
The plant tissues are mainly of two categories meristematic permanent
Meristematic tissues
Composed of a mature aur undifferentiated cells without intercellular spaces the cells may be rounded oval aur polygonal always living and thin walled each cell has a one tenth cytoplasm and a prominent nucleus in IT vehicles may be small or absent
Types of tissues
Root tip and shoot tip growth in length of plants and their branches
Meristem at the basis of leaves or at the basis of internodes internodal growth in monocots growth of leaf lamina in grasses
Lateral Meristem cambium between xylem and phloem and cork cambium in the cortex of dicot plants growth and thickness of the plant body secondary growth
Permanent tissues
Permanent tissues are those in which growth has stopped either completely or for the time being cells of these tissues maybe living or dead and thin walled or take world world permanent tissues are generally living where is the thick walled tissues maybe living or dead
Types of permanent tissues
Simple tissues a simple tissue is made up of only one type of cells common simple tissues are parenchyma collenchyma and sclerenchyma
Complex tissues a complex tissue is made up of more than one type of cells working together as a unit common examples are xylem and phloem
Simple plant tissues three Types of simple plant tissues parenchyma chlorenchyma and aerenchyma call ankamma for sclerenchyma
Timer oval around 10 volt with sufficient site plan has a prominent nucleus and intercellular spaces wall made up of cellulose they make large parts of various organs in most plants act as storage cells chlorenchyma carry out photosynthesis soft stem and root example of leaves endosperm of seed xylem and phloem
Chlorenchyma living parenchyma containing chloroplast parenchyma give registered to plant body and leaves and stems of aquatic plants and camel living parenchyma with large air spaces aur intercellular spaces
Call ankamma living elongated cells with thick primary was taking more in the corners of the cell wall material is cellulose and pectin intercellular spaces present gives mechanical support to the plant body specially in many dicot leaves and green distance the peripheral regions of stems and leaves
Sclerenchyma dead sclerenchyma consists of thick walled cells was uniformly Thakkar sclerenchyma is mainly a supporting tissue which can with stand strengths and protect the inner thin-walled cells from damage fibres dead elongated cells with pointed ends was are thick and thin sclereids dead a regular in shape cell wall are very thick making the cell cavity very small examples fibres occur in 50 or continuous bands in various parts of stem in many plants sclereids occur commonly in fruits and seeds present in some leaves in large numbers
Complex tissues complex tissues are mainly of two types xylem phloem and xylem and phloem form a continuous system inside the plants that is from the roots through the stem and leaves they are known as vascular tissues and form vascular bundles

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