Plant Parts - LeavesPlant Parts - Leaves

2001 AgriTeach.comTM (12901ms)

Why are plants important?Why are plants important?

They are the direct or indirect source of all They are the direct or indirect source of all food for animals.food for animals.

All plant life produces oxygenAll plant life produces oxygen What other benefits can you think of?What other benefits can you think of?

BeautificationBeautification Freshening airFreshening air Block windBlock wind Prevent soil erosionPrevent soil erosion Provide shelter for animalsProvide shelter for animals Building materials and fuelsBuilding materials and fuels

Can you think of the 4 basic parts & their Can you think of the 4 basic parts & their functions?functions? Leaves:Leaves:

• food factory of the plantfood factory of the plant Stems:Stems:

• support and moving materialssupport and moving materials Roots:Roots:

• anchor plant, store food, absorb nutrients, reproductionanchor plant, store food, absorb nutrients, reproduction Flower:Flower:

• forms fruit and seeds, allows for pollenationforms fruit and seeds, allows for pollenation

Basic Parts of the PlantBasic Parts of the Plant

Leaf Leaf AnatomyAnatomy

Functions of Leaf CellsFunctions of Leaf Cells

EpidermisEpidermis - Protects leaf from losing H - Protects leaf from losing H22OO

Palisade LayerPalisade Layer - Contains chloroplasts - Contains chloroplasts Spongy TissueSpongy Tissue - Allows for gas exchange - Allows for gas exchange Lower EpidermisLower Epidermis - Contains most stoma - Contains most stoma Stoma/Guard CellsStoma/Guard Cells - Open and close to - Open and close to

regulate amount of water in the leaf; prevents regulate amount of water in the leaf; prevents wilting.wilting.

Internal Leaf StructureInternal Leaf Structure How many different types of cells make up leaves?How many different types of cells make up leaves?

FIVE:FIVE: upper epidermis, palisade layer (has chloroplasts), upper epidermis, palisade layer (has chloroplasts), spongy tissue, lower epidermis, and guard cells.spongy tissue, lower epidermis, and guard cells.

Electron Micrograph of LeafElectron Micrograph of Leaf

Can you identify the layers?Can you identify the layers?

PhotosynthesisPhotosynthesis Photosynthesis is a chemical reaction:Photosynthesis is a chemical reaction:

6CO6CO22 + 6H + 6H22O + O + LightLight = C = C66HH1212OO66 + 6O + 6O22

Carbon Carbon DioxideDioxide

Water Water Glucose Glucose (energy)(energy)

Left over Left over OxygenOxygen

Plants also respirate, much like animals when light is Plants also respirate, much like animals when light is notnot available.available.

They do, however, make They do, however, make much moremuch more O O22 than they use. than they use.