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Plant Structure and Function - Coggle Diagram
Plant Structure and Function
Plant Cell
Difference with Animal Cell
Plant Cell
Cell wall present
One large vacuole
Have cell membrane too
Have chloroplasts
Have rectangular fixed shape
Animal Cell
Cell wall absent
One or more small vacuole
Only have cell membrane
Don't have chloroplasts
Have round irregular shape
Organelles
Chloroplast
Function
Produce energy through photosynthesis
Structure
Chloroplast envelope
Double membrane consist of inner and outer membrane
Intermembrane space
Space between inner and outer membrane
Thylakoid membrane
A collection of membranous sacs called thylakoids
The thylakoids are arranged in stacks known as grana
Surrounding & connecting grana is the stroma
Cell Wall
Function
Provide structural strength and support
Provide a semi-permeable surface for molecules to pass in and out of the cell
Ultrastructure
Biphasic structure consisting of cellulose microfibrils embedded in a gel-like cellulose matrix.
Structure
Arranged in layers and contains cellulose microfibrils, hemicellulose, pectin, lignin, and soluble protein.
Three major layers
Primary cell wall
Middle Lamella
Structure
Mainly composed of pectic polysaccharides, lignin, and a small amount of proteins
Function
Cementing layer between the primary walls of adjacent cells
Secondary cell wall
Pits
Structure
Pit chamber
The hollow area where the secondary layers of the cell wall are absent
Pit aperture
The opening at either end of the pit chamber
Pit membrane
The membrane between adjacent cell walls
Function
Allow the flow of water and nutrients from one element to another
Vacuole
Structure
Membrane bound structure found in the cytoplasmic matrix of a cell.
The membrane surrounding the vacuole is known as tonoplast.
Structure
Composed of highly ordered lipids which form regions of free liquid lipid bilayer loosely bound to integral proteins
Function
Separate the inner vacuole, or vacuole lumen, from the outer cellular cytoplasm, or cytosol
The components of the vacuole, known as the cell sap, differ from that of the surrounding cytoplasm.
The membranes are composed of phospholipids.
Function
Storage for salt and water
Amyloplast
Structure
A type of plastid surrounded by a double lipid bilayer of inner and outer envelope membrane
Function
Starch synthesis and storage
Plasmodesmata
Structure
Cylindrical channels that directly connect the cytoplasm of neighboring plant cells, establishing living bridges between cells.
Function
Facilitate the movement of molecules between cells, ranging from small photosynthetic products to large proteins and mRNA.
Plant Tissue
Phloem
Function
Transport sugar from leaves to all parts
Position in Stem
Toward the outside of the vascular bundle
Structures
Consists of living cells arranged end to end
Its vessel contain cytoplasm
Xylem
Function
Transport water and minerals from roots to all parts
Position in Stem
Towards the centre
Structure
Consists of a variety of specialized, water-conducting cells known as tracheary elements.
Sclerenchyme
Function
Provide mechanical support
Position in Stem
Below the epidermis of monocotyledons
Structures
composed of dead cells that have heavily thickened walls containing lignin and a high cellulose content
Collenchyme
Flexibility and elasticity to prevent tearing in plants
Parenchyme
Storage of food
The Importance of A Substance to Plant
Water
For photosynthesis
For support
For transport
To keep them cool
Inorganic Ions
Calcium Ions
Together with pectin, making the calcium pectate
Which holds plant cells together
In the permeability of membranes
Magnesium Ions
To produce the chlorophyll
For the activation of some plant enzymes
Synthesis of nucleic acid
Nitrate
to make DNA
To make many hormones
To make amino acids
Carbohydrates
Dissacharides
Monosaccharides
Polysaccharides
Starch
Structure
Amylopectin
Amylose
linear polysaccharide composed entirely of D-glucose units joined by the α-1,4-glycosidic linkages
Function
Energy storage
Cellulose
Structure
linear chains of glucose units linked by β-1,4-glycosidic bonds
Function
Helps the plant to remain stiff & strong
How the arrangement of cellulose microfibrils and secondary thickening in plant cell walls contributes
Xylem vessels
It contributes to their mechanical strength and stiffness, allowing them to withstand the high pressures generated by water transport.
It provides mechanical support and makes them more resistant to collapse under the pressure of water.
Sclerenchyma fibers
Gives sclerenchyma fibers their high tensile strength and resistance to deformation.
As a result, they are commonly used in the production of textiles, paper, and other products that require strong and durable fibers.