This document summarizes the three types of simple permanent plant tissues: parenchyma, collenchyma, and sclerenchyma. Parenchyma cells are living with thin walls, large spaces between cells, and function in packing, photosynthesis, and storage. Collenchyma cells have irregularly thickened corners, provide flexibility and support. Sclerenchyma cells have thick lignin walls, are dead at maturity, and provide stiffness and protection.
In biology, tissue is a cellular organizational level between cells and a complete organ. A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Broadly tissues can be classified into two major groups : Plant tissue and Animal tissue.
A plant tissue can be defined as a cell or a group of cells dividing, to give rise to large number of cell, which is collectively referred as tissues. They are structurally and functionally similar to these cells. Plants do have a higher level of structure called plant tissue systems. A plant tissue system can be defined as a functional unit, which connects all organs of a plant. Like animal tissue system, plant tissue system is also grouped into various tissues based on their functions.
In this lesson you will learn about :
1) Tissues - "The Teams of Workers"
2) Types of Plant Tissues
3) Plant Tissue Systems
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
In biology, tissue is a cellular organizational level between cells and a complete organ. A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Broadly tissues can be classified into two major groups : Plant tissue and Animal tissue.
A plant tissue can be defined as a cell or a group of cells dividing, to give rise to large number of cell, which is collectively referred as tissues. They are structurally and functionally similar to these cells. Plants do have a higher level of structure called plant tissue systems. A plant tissue system can be defined as a functional unit, which connects all organs of a plant. Like animal tissue system, plant tissue system is also grouped into various tissues based on their functions.
In this lesson you will learn about :
1) Tissues - "The Teams of Workers"
2) Types of Plant Tissues
3) Plant Tissue Systems
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
It explains about what is plant tissue & both the types i.e meristem & permanent tissue. It also explains about the general characteristic, and how it has been classified based on origin, position, function and plane. It also furnish further information regarding the above
The epidermis is the outermost cellular layer which covers the whole plant structure, i.e. it covers roots, stem, leaves.
It is composed of a single layer of living cells, although there are exceptions.
Epidermis is usually closely packed, without intercellular spaces or chloroplasts. Instead, the epidermis is like a clear spray coating whose sole purpose is to protect the plant from the elements, while still letting the sun shine in. That's particularly important for a leaf because their main job is to photosynthesize.
Composition of Epidermis:
Epidermal Proper Cells
Specialized cells
Stomatal Guard Cells
Trichomes
Epidermal Proper Cells:
These cells vary in thickness and shape
The outer walls, which are exposed to the atmosphere and usually thickened, and may be covered by a waxy, waterproof cuticle which are made up of cutin. Apart from the normal epidermal cells there are also stomata in the epidermis of leaves and stem.
Wax in the form of granules or rods may be deposited on the surface of cuticle as continuous.
Specialized Epidermal Cells:
In certain species of pteridophytes and gymnosperm, many species of Graminae and certain dicots, fiber-like epidermal cells are formed.
In Graminae and many other monocots ,bubble-like cells are formed called Bulliforms cells, these cells are larger then normal epidermal cells and are thin walled.
Function:
These cells are concerned with opening of rolled leaf as enclosed in bud.
Rolling and unrolling of mature leaves as a result of loss and uptake of water.
Stomatal cells:
A stoma is an opening (pore) which is bounded by two bean shaped cells called guard cells and two to four subsidiary cells that lack chloroplasts.
The guard cells differ from normal epidermal cells in that they have chloroplasts and the cell walls are thickening unevenly; the outer wall is thin and the inner wall (nearest the opening) is thick.
The leaf and stem epidermis is covered with pores called stomata (sing., stoma), part of a stoma complex consisting of a pore surrounded on each side by chloroplast-containing guard cells.
The epidermal cells protect the underlying cells.
The waxy cuticle prevents the loss of moisture from the leaves and stems.
The transparent epidermal cells allow sunlight (for photosynthesis) to pass through to the chloroplasts in the mesophyll tissue.
The stomata of leaves and stems allow gaseous exchange to take place which is necessary for photosynthesis and respiration.
Water vapour may be given off through the stomata during transpiration.
The root-hairs absorb water and dissolved ions from the soil.
It explains about what is plant tissue & both the types i.e meristem & permanent tissue. It also explains about the general characteristic, and how it has been classified based on origin, position, function and plane. It also furnish further information regarding the above
The epidermis is the outermost cellular layer which covers the whole plant structure, i.e. it covers roots, stem, leaves.
It is composed of a single layer of living cells, although there are exceptions.
Epidermis is usually closely packed, without intercellular spaces or chloroplasts. Instead, the epidermis is like a clear spray coating whose sole purpose is to protect the plant from the elements, while still letting the sun shine in. That's particularly important for a leaf because their main job is to photosynthesize.
Composition of Epidermis:
Epidermal Proper Cells
Specialized cells
Stomatal Guard Cells
Trichomes
Epidermal Proper Cells:
These cells vary in thickness and shape
The outer walls, which are exposed to the atmosphere and usually thickened, and may be covered by a waxy, waterproof cuticle which are made up of cutin. Apart from the normal epidermal cells there are also stomata in the epidermis of leaves and stem.
Wax in the form of granules or rods may be deposited on the surface of cuticle as continuous.
Specialized Epidermal Cells:
In certain species of pteridophytes and gymnosperm, many species of Graminae and certain dicots, fiber-like epidermal cells are formed.
In Graminae and many other monocots ,bubble-like cells are formed called Bulliforms cells, these cells are larger then normal epidermal cells and are thin walled.
Function:
These cells are concerned with opening of rolled leaf as enclosed in bud.
Rolling and unrolling of mature leaves as a result of loss and uptake of water.
Stomatal cells:
A stoma is an opening (pore) which is bounded by two bean shaped cells called guard cells and two to four subsidiary cells that lack chloroplasts.
The guard cells differ from normal epidermal cells in that they have chloroplasts and the cell walls are thickening unevenly; the outer wall is thin and the inner wall (nearest the opening) is thick.
The leaf and stem epidermis is covered with pores called stomata (sing., stoma), part of a stoma complex consisting of a pore surrounded on each side by chloroplast-containing guard cells.
The epidermal cells protect the underlying cells.
The waxy cuticle prevents the loss of moisture from the leaves and stems.
The transparent epidermal cells allow sunlight (for photosynthesis) to pass through to the chloroplasts in the mesophyll tissue.
The stomata of leaves and stems allow gaseous exchange to take place which is necessary for photosynthesis and respiration.
Water vapour may be given off through the stomata during transpiration.
The root-hairs absorb water and dissolved ions from the soil.
Disassembling Of the old working pc
In this Instruction, I will give a full documentation of how to disassemble a desktop PC, for parts. The specific computer that I will demonstrate with is an HP Media Center PC m7640n with a dead motherboard. Every computer is different, but this is a general guide.
If you don't fully grasp what I mean when I am describing something, please refer to the pictures!
Step 1.
Selection the required tools and equipment:
1. Screw Driver.
2. Multimeter.
3. Soldering iron.
4. Contract cleaner.
5. Brush.
Step 2.
To turn off the power:
If the PC being running, must shut down the pc before disassembling.
There are many ways to shut down your PC—you can turn the PC off completely.
Turn your PC off completely
To shut down:
For Windows 10 Select the Start button and then select Power > Shut down.
For Windows 8.1 / Windows RT 8.1
Move your mouse to the lower left-hand corner of the screen and right-click the Start button or press Windows logo key + X on your keyboard. Tap or click Shut down or sign out and choose Shut down.
For Windows 7 Click the Start button and then click the Shut down button. Click the Start button and then click the Shut down button.
Step 3: Unplugging
The first thing you do, is unplug every cable that's plugged in to your computer. That includes the following cables:
________________________________________
• Power
• USB
• Firewire
• Mouse
• Keyboard
• Internet
• Ethernet
• Modem
• AM\FM Antenna
• Cable TV
• etc...
So pretty much just unplug every cable from your computer.
Step 2: Outer Shell/Casing
Now that your computer is fully unplugged, move your PC to a clean work space, preferably a carpet. The carpet is better than tile, because screws and other small parts will roll around.
NOTICE:
If you are working on a carpet, about every five minutes touch something that is grounded (Sink faucet\pipe, wire coming from the ground part of a wall outlet). This is so you don't shock your motherboard or other parts.
First off, unscrew the four screws on the back of the computer. On most computer cases, there will be large knobs that you can unscrew by hand or by screw driver on the back-right side of the computer. The left side has small screws because on that side you can't access much on the inside.
Once the screws are removed, you can remove the side panels. On most computers, they just slide off. Start with the left side panel (the side that once had the knobs), slide it towards the back of the computer. Now you can remove the left panel. Just like the other one, slide it towards the back of the computer.
Please refer to the pictures if you are confused!
Step 3: Outer Shell/Casing (cont.)
In the last step I removed both side panels. In this step, I will be removing the front and top panels.
________________________________________
Wait For Next Part...
In Class 9 Biology, tissues are an essential topic. Let's go through some key points about tissues:
Definition:
A tissue is a group of cells that have a similar structure and work together to perform a specific function.
Types of Tissues:
1. Epithelial Tissue:
Location: Covers body surfaces, lines cavities and organs.
Functions: Protection, secretion, absorption, and sensation.
Types: Simple epithelium (single layer), stratified epithelium (multiple layers), and pseudostratified epithelium.
2. Connective Tissue:
Location: Found throughout the body.
Functions: Support, bind together, and protect tissues and organs.
Types: Loose connective tissue, dense connective tissue, cartilage, bone, blood, and adipose tissue.
3. Muscular Tissue:
Location: Attached to bones (skeletal), walls of internal organs (smooth), and heart (cardiac).
Functions: Movement and locomotion (skeletal), involuntary movements of organs (smooth), and pumping of blood (cardiac).
4. Nervous Tissue:
Location: Brain, spinal cord, and nerves.
Functions: Transmit and receive impulses, coordinate and regulate body activities.
Composed of neurons and neuroglial cells.
Plant Tissues:
1. Meristematic Tissue:
Location: Found at the growing tips of roots and stems.
Functions: Responsible for plant growth and development.
2. Permanent Tissue:
Simple Permanent Tissue: Parenchyma (storage), Collenchyma (support), and Sclerenchyma (mechanical support).
Complex Permanent Tissue: Xylem (water transport) and Phloem (food transport).
Differences Between Plant and Animal Tissues:
Plant tissues have cell walls, while animal tissues do not.
Plant tissues have chloroplasts for photosynthesis, which animal tissues lack.
Plant tissues often have intercellular spaces, allowing gas exchange, while animal tissues generally do not.
Cell Organelles in Tissues:
Cells in tissues contain various organelles, such as the nucleus, mitochondria, endoplasmic reticulum, and Golgi apparatus, each contributing to specific cellular functions.
For more detail, visit. www.vavaclasses.com
In plant anatomy, tissues are categorized broadly into three tissue systems: the epidermis, the ground tissue, and the vascular tissue. Epidermis - Cells forming the outer surface of the leaves and of the young plant body. Vascular tissue - The primary components of vascular tissue are the xylem and phloem.
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Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
2. Permanent Tissue
Perform specific functions.
No ability to divide.
Has permanent shape, size and function.
Differentiation is a process by which cells formed by
meristematic tissue become a permanent tissue.
Differentiated cells are called Derivatives.
4. Permanent Tissue types:
A. Simple Permanent Tissue
Tissues which are made up of similar type of cells.
B. Complex permanent Tissue
Tissues made up of many cells.
7. Types
a. Chlorenchyma
Parenchyma with chlorophyll
Tissue which contains chlorophyll pigment.
Helps in photosynthesis.
b. Aerenchyma
Parenchyma with air cavities in aquatic plants.
Helps in floating.
9. 2. Collenchyma
Characteristics
Tissue responsible for
flexibility in plants.
Supporting and strengthening tissue.
Irregularly thickened at corners,
thickened by pectin.
Less intercellular spaces.
10. Where are they found?
Leaf stalks below epidermis.
Expanded leaves.
Stem apex
Function
Allows bending of stems, leaves without
breaking.
Provide mechanical support.
11. 3. Sclerenchyma
Tissue responsible for stiffness in plants.
Long, narrow and dead cells.
Thickened cell walls made of cellulose
impregnated with lignin.
Simple pits are present in thickened cell walls.
No intercellular spaces.
Characteristics
12. 2 types of sclerenchyma cells.
Sclereids
Fibres
Where are they found?
Hard covering of seeds and nuts.
Veins of leaves
Stem around vascular bundles.
14. PARENCHYMA COLLENCHYMA SCLERENCHYMA
Cells Living Living Dead on maturity
Intercellular space Large Less Absent
Cell wall Thin Irregularly thickened
at corners
Thickened with pectin
Thickened with lignin
Function Packing tissue
Photosynthesis
in leaves
Storage of food
and nutrients
Flexibility Stiffness
Support and protection