| Nature of plant materials could be hard, soft or spongy.
| Nature of plant materials have adapted according to their function.
| Group of cells has formed tissues in order to perform a particular function.
| Animal bodies are also formed with different types of tissues.
| Nature and functions of animal tissues are diverse
Parenchyma, collenchyma, sclerenchyma, xylem and phloem are plant tissues.
Tissues of Parenchyma, collenchyma and sclerenchyma contain only one type of cell.
Parenchyma | collenchyma | sclerenchyma | |
Properties | Living cells Isodiametric cells Inter cellular space present | Polygonal in shape Inter cellular space present Extra cellulose in corners Shiny cell wall | Hard dead cells Lignified walls Lack intercellular space |
Distribution | Yams, fruits, Leaves, seeds Other edible Parts of plants | Dicot plants, In veins of leaves and layers immediately interior to epidermis in young stems | Seed coat of dates, shell of coconut |
Function | Storage of food and water, Mechanical support to herbaceous plants through the turgidity of cells. | Mechanical support to dicot plant parts | Protection and support to plant parts |
Parenchyma- different types:-
Pallisade parenchyma
Spongy parenchyma
Aerenchyma
xylem | phloem |
Tubular structure | Tubular structure |
Vessels,tracheids,fibers,parenchyma | Sieve tube elements , Companion cells, fibers, parenchyma |
Transport of water & minerals Provide mechanical support | Transport of food & storage |
Major animal tissues:-
Blood tissue
Muscle tissue
Epithelial tissue
Blood tissue-cells and plasma present
Transports and fight diseases
Epithelial tissue:-
Covers body surfaces and organs
Muscle tissue
Smooth muscles | Skeletal muscles | Heart muscles |
Spindle shaped, Unstriated, uninucleate cells | Muscle fibres,unbranched, Non spindle shaped fibers, striated | Non spindle shaped fibers, striated, branched |
Lining of alimentary canal, urinary bladder, Arteries, veins | Attached to skeleton | In heart |
Slow movement Non voluntary movement, | Quick movement, Easily tired | Rhythmic beat, functions till death |
Mutated cells cause cancer
