Class notes
Class notes Life Sciences (Biology)
- Course
- Life Sciences
- Institution
- 10th Grade
This document provides information about the permanent plant tissues.
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Permanent TissuesSaturday, 03 August 2024 18:47
A tissue is a group of similarly different cells which are adapted
to perform a particular function.
Epidermis :
Structure: Made up of a single layer of cells.
Cells are thin walled and brick shaped.
There are two types of specialized epidermal cells:
The epidermis of the leave have specialized epidermal cell called the guard cell.
The guard cells protect the opening called the stomata.
The epidermis of the root has a specialized cell root called the root hair.
Function: They provide the inner tissue with protection.
They control the opening and closing of the stomata.
The stomata allows gaseous exchange.
The root hair absorbs minerals and water.
Parenchyma:
Structure:
Location: Found in root and stems.
It is found in all other tissues in these organs.
Appearance: It is made up of thin walled, irregularly shaped cells.
The irregular shape allows for the formation of many airspaces between
the cells.
They are chlorenchyma when they have chloroplast.
Function: Act as packing tissue
Acts as a storage organ, when it stores food in the
form of starch and other sugars.
The airspaces allow gaseous exchange.
Collenchyma:
Structure:
Location: This tissue is found in stems and leaves.
Appearance: Made up of thick walled and closely packed cells.
Function: Provides strength and support to the arial parts of the plant.
Sclerenchyma:
Structure:
Location: Found in the roots, stems, leaves and fruit of the plants.
Appearance: Made up of thick walled cells.
The cell walls are thickened with lignin.
These cells are closely packed.
The cells are dead, there are cell content.
Function: They provide strength
Xylem:
Structure:
Location: This tissue is found in the roots, stems and leaves.
Appearance: There are 4 different types of cells that make the
xylem tissue.
They the xylem vessels and xylem tracheids.
Plant Tissues Page 1
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