2.3.3 Ground Tissue in Plant

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Three types of ground tissues :

Parenchyma
Collenchyma
Sclerenchyma

Living cells with nucleus at maturity
• Primary cell walls are thin and flexible
(consists of cellulose, hemicellulose and pectin)
• Cells are loosely packed with intercellular air spaces

Parenchyma's structure

Living cells with nucleus at maturity
• Primary cell walls are unevenly thickened at corners
(consists of cellulose, hemicellulose and pectin)
• Cells are closely packed, no intercellular air spaces

Collenchyma's structure

Dead cells without nucleus at maturity
• Secondary cell walls are evenly thickened and lignified
(consists of cellulose, hemicellulose and lignin)
• Cells are tightly packed together, no intercellular space

Sclerenchyma's structure

Parenchyma

Front image: 

Collenchyma

Front image: 

Sclerenchyma

Front image: 

Function of Parenchyma

Store organic substances -> from large central vacuole
Photosynthesis -> the mesophyll cells contain chloroplast
Gaseous exchange -> due to large intercellular space
Attract pollinator -> as some cells contain chromoplast

Function of Collenchyma

Support in herbaceous plant or young parts of plant
Gives mechanical strength and flexibility – to allow the cell to expands as it grow

Function of Sclerenchyma

Support and protection from mechanical damage
Provide mechanical strength and rigidity to the plant

Which type of ground tissue mostly found in leaf, stem and root?

Parenchyma

Which type of ground tissue mostly found young parts of the plant shoot and petioles?

Collenchyma

Sclereid is a type of ___________ that is found in stones of cherry

Sclereid is a type of sclerenchyma that can be found in stones of cherry

Fibre is a type of ____________ that can be found in wood or inner bark.

Fibre is a type of sclerenchyma that can be found in wood or inner bark.

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