Identification of Parenchyma, Collenchyma and Sclerenchyma tissues in plants,
striped, smooth and cardiac muscle fibres and nerve cells in animals from prepared
slides. Drawing of their labelled diagram
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Answer:
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Answer:
I. Parenchyma
Cells of Parenchyma tissue are isodiametric.
Intercellular spaces are present in between the cells.
Parenchymatous cells possess large central vacuole and peripheral cytoplasm with a nucleus.
These are generally present in the soft parts of plants like leaves, roots, flowers, etc.
The important functions of parenchymatous cells are storage, photosynthesis, etc.
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II. CoIIenchyma
Collenchymatous cells are somewhat oval to elongated.
Each cell possesses large central vacuole and peripheral cytoplasm with prominent nucleus.
Thickenings are present at corners of cells. Thickening comprise of cellulose and pectin.
Intercellular spaces are absent.
Collenchymatous cells are commonly present below the epidermis in petiole, leaves and stems. Its
main function is to provide mechanical strength.
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III. Sclerenchyma
Cells of sclerenchyma tissue are dead with highly thickened walls.
Thickenings consist of lignin.
There are two types of sclerenchyma cells:
fibres which are elongated cells with tapering ends and
sclereids (also called stone cells), which are roughly isodiametric cells with narrow cavities.
Sclerenchymatous cells have pits which act as connections with adjacent cells.
The main function of sclerenchyma is to provide support .
