Parenchyma tissue is present in the following plant parts:
Stem, leaves, roots, flowers and vascular tissues.
Tissue is defined as a group of similar cells that are arranged and designed to perform a specific function
The specific function of cardiac muscle is to contract and relax rhythmically through the life and to facilitate the transportation of gases, nutrients and metabolites to various body parts through blood circulation.
Xylem tissue is a type of complex tissue. There are four types of elements that together make up the xylem tissue. The different types of elements are:
Cork is a several layered thick outermost protective tissue present on mature plants. The cells of cork are compactly arranged without the intercellular spaces and are dead. A special chemical called suberin is present in the cell walls of the cork cells that make them impermeable to gases and water. Due to this, it protects plants against water loss. It also protects plants against mechanical injury and temperature extremes. It also protects plants against fungal diseases by not allowing the parasitic fungi to grow on the plants. .
Labelled diagram of a neuron:
Stomata perform the following two functions;
Epidermis performs the following functions in plants:
Name of the organ |
Type of tissue present |
Skin |
Stratified squamous epithelial tissue |
Bark of tree |
Secondary meristem (cork) |
Bone |
Connective tissue |
Lining of kidney tubule |
Cuboidal epithelial tissue |
Vascular bundle |
Complex tissue: xylem and phloem |
(a) Squamous epithelial tissue
(b) Tendon
(c) Phloem
(d) Adipose tissue
(e) Blood
(f) Nervous tissue
Difference between striated, unstriated and cardiac muscles on the basis of their structure |
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Character |
Striated muscles |
Unstriated muscles |
Cardiac muscles |
Size and shape |
Long and cylindrical |
Long, narrow and spindle shaped |
Short and cylindrical |
Branching |
Absent |
Absent |
present |
Number nucleus present |
Multinucleate |
Uninucleate |
Uninucleate |
Position of nucleus |
Peripheral |
Central |
Central |
Striations |
Present in the form of dark and light bands |
Absent |
Present in the form of faint bands |
Edges of the cell |
Blunt ends |
Tapered end |
Flat and wavy |
Difference between striated, unstriated and cardiac muscles on the basis of their location |
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|
Striated muscles |
Unstriated muscles |
Cardiac muscles |
Location |
Tongue, hands, legs, etc. |
Iris of the eye, ureters, bronchi, etc. |
Heart |
Parenchyma |
Collenchyma |
Sclerenchyma |
Cell walls are thin. |
Cell wall is irregularly thickened at the corners. |
Cell wall is uniformly thickened. |
Cell wall is mainly composed of cellulose. |
Pectin and hemicelluloses are the main constituents of the cell wall in this tissue. |
The thick cell wall scelerenchyma are impregnated with lignin. |
Character |
Simple tissues |
Complex Tissues |
Composition of cells |
Composed of only one type of cells |
Composed of different types of cells |
Origin and structure of cells |
Common origin and structure |
Different origin and structure |
Function |
Storage of food and supportive in nature |
Transport water, minerals, sugar and metabolites within plant body |
Examples |
Parenchyma, Collenchyma, Sclerenchyma |
Xylem and phloem |
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