Collenchyma tissue provides mechanical support for growing plants. It consists of living cells with thickened, uneven cell walls that are strongest at the corners. Collenchyma tissue is found below the epidermis and in the midribs of leaves and petioles in herbaceous plants. The thickened cell walls allow the tissue to provide support while still allowing bending, and to help growing organs expand. The tissue can also perform photosynthesis and store starch.

1. BIOLOGY TERM 1
Chapter 2.3 Specialized Cell
Plant Tissue

2. PERManEnT TIssuE

4. What is collenchyma tissue ?
The tissue which provide mechanical
support for growing plants
Consists of living cells
Living cells : nucleus, cytoplasm and
vacuole
vacuole

5. collenchyma

6. Where can you found collenchyma
cells ?
 Usually found in herbaceous plants below the
epidermis, midrib of the leaves and leaf petioles

7. Structure cOLLeNcYMA tISSue ~
 Polygonal in shape and elongated
 The end of cell wall may be tapered
 The cells are closely packed together with very small or no
intercellular air space
 The cell wall are unevenly thickened with deposits of
cellulose(primary wall), pectin and hemicellulose
 The thickenings usually occur at corners of the cell walls
(angular collenchyma)
 Pits are present in the walls

8. What are the functions of collenchyma tissue?
 Provide support for plants ,allowing bending but not breaking
 Provide mechanical support to new developed or growing organs
especially roots and stem
 It allows the cells to expand and be stretched as the young stem
grows
 The thickened edge of collenchyma walls : increases the strength of
tissues
 Can carry out photosynthesis
 Can store starch as food

9. What is the relationship between the structure
of collenchyma and its function ?
 The corners of cell walls are heavily thickened with cellulose
make collenchyma a very strong tissue
 The presence of chloroplast
enable collenchyma cells to photosynthesized
 Have cytoplasm
stored food , starch

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