Explain types of sclerenchyma tissue.
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Answers
Answer:
there is no type i guess .
Explanation:
sclerenchyma tissue are called dead tissue .provide strength , support and was various type of hard woody cells .they have lignin cement of tissue to provide rigidity and hardness.
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Answer:
the hardest tissue in human body is known as sclerenchyma tissue
Explanation:
different types of sclerenchyma tissues are :
1. Mechanical Sclerenchyma: It is a kind of sclerenchymatous tissue that functions as a “Supportive tissue” by reducing the wilting in plants, maintaining plant physiology, providing strength to withstand against the tearing forces of waves and current etc. Mechanical sclerenchyma comprises of sclereid and fibre cells that contribute strength and stiffness to the plant system.
2. Sclereids
Sclereids can define as a mechanical tissue that involves the following features:
It occurs singly or in groups.
Sclereids are found associated with the plant’s vascular tissue, namely xylem and phloem.
Its cell-wall thickening is non-uniform and contains a number of simple pits with round apertures.
Sclereids most usually comprises of the narrow lumen.
3. Macrosclereids
It also refers as “Malpigian cell”.
Appearance: Elongated and columnar in shape.
Cell wall: Comprises of a thickened cell-wall.
Occurrence: Usually found in the outer epidermal cells of seed.
Example: Seed coat of Pisum species.
4.Osteosclereids
It also refers to as “Bone cells”.
Appearance: Appears very similar to the shape of a bone of hourglass with enlarged, lobed and columnar cells. It is lobed towards the end.
Cell wall: Comprises a thickened cell-wall.
Occurrence: Usually found below the epidermal layer i.e. hypodermis of seeds and leaves of certain plants belongs to the category of Xerophytes.
Example: Leaves of Hakea species.
5.Astrosclereids
It also refers to as “Stellate cells”.
Appearance: These appear to be star-like, deeply lobed with the radiating arms from the central body. The radiating arms are usually pointed, irregular and varied in number.
Cell wall: Comprises a thickened cell-wall.
Occurrence: Extends from upper to lower epidermis of the leaf.
Example: Leaves of Thea, Olea etc.
6.Brachysclereids
It also refers to “Grit cells”.
Appearance: It deeply resembles the parenchymatous cells, and its symmetry is roughly isodiametric.
Cell wall: Comprises a thickened cell-wall.
Occurrence: It is commonly present in the fleshy portions of fruit.
Example: Flesh of pear fruit, where brachysclereids form a grit and also refers as stone cells.
7. Trichosclereids
It also refers to as “Needle-like cells”.
Appearance: It seems to be hair-like, more elongated, and branched cells stretching towards the intercellular space.
Cell wall: Comprises a thickened cell-wall.
Occurrence: Present in the specialized tissues of leaves and roots
Example: Aerial roots of Monstera sp, leaves of olive and water-lily etc.
8. Filiform sclereids
It also refers to as “Fibre-like cells”.
Appearance: These are very much elongated, sparingly-branched and uncommon kind of a cell.
Cell wall: Comprises a thickened cell-wall.
Occurrence: Found in the specialized tissues of leaves
Example: Leaves of Olea.