define the term tissue
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➡A group of similar cells that work together to perform a specific function is known as tissue.⬅
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anushka9536:
tq
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Tissues are the group of similar cells specialized to perform a common function.
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Tissues are of two types:
• Plant tissues
• Animal tissues
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PLANT TISSUES :
* Meristematic tissues:
Cells are capable of cell division repeatedly
Types of Meristematic tissues;
=> Apical meristem
• Present at growing tips of stems and roots.
=> Lateral meristem
• Present at lateral sides of root and stems.
=> Intercalary meristem
• Present at the base of the leaves or internodes on twigs.
* Permanent tissues
These are Meristematic tissues which on maturity lose ability to divide and differentiate into specialized tissues.
Types of permanent tissues;
=> Simple permanent tissues
• Made up of only one type.of tissue.
It's type;
*Parenchyma
*Aerenchyma.
*Collenchyma
*Sclerenchyma
=> Complex permanent tissues
• Made up of more than one type of tissues.
It's type;
• PHLOEM
types of cells;
Sieve tubes
companion cells
phloem fibres
Phloem parenchyma.
• XYLEM
Types of cells
Tracheids
Vessels
Xylem parenchyma
Xylem fibres
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ANIMAL TISSUES
•EPITHELIAL TISSUES
Protective tissues covering the entire animal body internally and externally.
Types;
Squamous
Ciliated
Cuboidal
Glandular
Columnar
•MUSCULAR TISSUES
Elongated cells called muscular fibres made up. of contractile protein.
Types;
Striated
Smooth
Cardiac
•CONNECTIVE TISSUES
*Connects or binds different tissue or *organ.
Types;
*Areolar
*Dense Regular Connective Tissue
Connective Tissues;
=Tendon and ligaments
*Adipose
*Skeletal
=Cartilage and bone
*Fluid ( Help in transportation of materials and provide defence.)
*Blood; ( fluid, slightly alkaline)
:Blood cells
= RBC
=WBC
= Blood platelets
:Plasma.
*Lymph (Straw coloured fluid containing inorganic salts and organic compounds )
•NERVOUS TISSUES
made up of nerve cells or neurons.
I Hope it's clear ..
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