Brief note on epidermis.?
Answers
Epidermis: The upper or outer layer of the two main layers of cells that make up the skin. The epidermis is mostly made up of flat, scale-like cells called squamous cells. Under the squamous cells are round cells called basal cells. The deepest part of the epidermis also contains melanocytes.
Epidermis is the outer most layer , slightly flattened , living , compact i.e no intracellular spaces . Long rectangular shape.
● Functions of epidermis.
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1. Protect the underlying cells .
2. It prevents desiccation or dehydration of cells .
3. It prevents the cell from the attack of pathogens.
● Root epidermis cells have outgrows roots hair which helps to increase surface for absorption of water and minerals.
● Leaf epidermis have a wax coat i.e cuticle . Guard cells helps in opening and closing of stomata . In between epidermis cells stomata is present.
● Suberin - Function
Suberin makes cells light and make impervious the exchange of water and air.
●Cork - Cork is a compact group of dead cells. ( It is also the outermost layer of stem).
● Cork structure......--
1. Many layered
2. Having Suberin
3. No intracellular spaces and
4. Are dead