Growth and Development Meristem: Undifferentiated cells that divide and differentiate rapidly. Germination: Growth from a seed to a seedling
Growth Growth Types Growth in response Primary to a stimulus Secondary Geotropism Phototropism
Tissues Dermal Tissue: offers protection and prevents water loss Epidermis Vascular Tissue: transportation of materials Xylem and Phloem Ground Tissue: production and storage of sugars Parenchyma: versatile with varying functions Collenchyma: support structure Sclerenchyma: support structure, cells are dead
Systems Root Taproot vs fibrous Stem Herbaceous vs woody Leaves
Transport Tissues Transports water up through Xylem: the roots to other parts of the plant. Turgor Pressure Transports sap from the Phloem: photosynthetic parts of the plant (leaves) to the rest of the plant.
Transporting Water Stomata-tiny openings on the leaf that allow gas exchange and water loss Guard cells-open and close stomata for the sake of homeostasis Transpiration: water lost through stomata causes a difference in pressure. This results in water being “sucked up” through the xylem.
Leaves Cuticle: Waxy coat on the outside of the leaf Trichomes: Little “hairs” on the leaf
Leaves Continued Mesophyll-groundtissue in leaf. Where most photosynthesis in plants takes place. Chlorophyll-pigment that causes green coloration Chloroplasts-organelle unique to photosynthetic organisms which allows photosynthesis to occur
All ImagesCourtesy of Wikipedia http://en.wikipedia.org/wiki/Meristem http://en.wikipedia.org/wiki/Germination http://en.wikipedia.org/wiki/Tree_rings#Growth_rings http://en.wikipedia.org/wiki/Tree_rings#Growth_rings http://en.wikipedia.org/wiki/Fibrous_root_system http://en.wikipedia.org/wiki/Fibrous_root_system http://en.wikipedia.org/wiki/Tree http://en.wikipedia.org/wiki/Herbaceous_plant http://en.wikipedia.org/wiki/Stomata http://en.wikipedia.org/wiki/Leaf http://en.wikipedia.org/wiki/Corn