DEFINITIONS AND KEY POINTS FOR TISSUE AND TISSUE SYSTEM

Tissue

The group of cells performing some collective function is called tissue.

Simple tissues

The tissues with similar type of cells are

called simple tissues.

Compound tissues

The tissues wtith different types of cells are called compound tissues.

Parenchyma

The simple tissues with cells having thin and elastic walls are called parenchyma.

Collenchyma

The parenchyma cells with uneven angular thickening which support young growing part of plant are called collenchyma.

Sclerenchyma

The lignified tissues which lack protoplast at maturity are called sclerenchvma.

Fiber

Very long and narrow  sclerenchymatous cells with tapering ends are fibers.

Sclereids

The variable shaped sclerenchymatous cells with strongly lignified wall having simple pits are called sclereids.

Tracheary elements

The specialized water and salt conducting cells of xylem are called tracheary elements.


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Vessel

membranes

The tracheary elements which are short, wide and with perforated end walls are called vessel members.

Tracheids

The tracheary elements which are elongated tube like w ith tapering ends are called tracheids.

Primary xylem

The xylems produced as a result of primary growth are called primary xylem.

Protoxylem

The early primary xylems are called

protoxy lem.

Phloem

Phloems are living conducting tissues. They conduct prepared food form leaves to ditTerent part of the plant.

Phloem

Phloems are living conducting tissues. They conduct prepared food form leaves to different part of the plant.

Sieve elements

The elongated cells with characteristic sieve areas in their walls are called sieve elements.

Sieve elements

The elongated cells with characteristic sieve areas in their walls are called sieve elements.

Companion

The thin walled parenchyma cells closely

 

 

 

 

 

 

 

 

 

 

 

 

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