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23.1 & 23.4

Roots absorb water and nutrients from the ground; principal organ
Stems supports plant body; protection against predators; principal organ
Leaves photosynthetic organ; principal organ
Dermal Tissue the outer surfaces of epidermal cells are often covered with a thick waxy layer (cuticle); outer layer
Xylem vessel element which allows water to move freely throughout the plant
Phloem companion cell which allows substances such as nutrients and food to move freely throughout the plant
Parenchyma thin cell walls (Ground Tissue)
Collenchyma thicker cell walls (Ground Tissue)
Sclerenchyma thickest cell walls (Ground Tissue)
Ground Tissue neither vascular or dermal and produces and stores sugars, and contributes to physical support of the plant; inter layer
Vascular Tissue supports the plant body and transports water and nutrients throughout the plant; central layer
Palisade Mesophyll the layer beneath the epidermis where photosynthesis occurs; packed cells absorb sunlight which enters the lead
Spongy Mesophyll the layer beneath the palisade; air pockets may be present
Stomata small openings in the epidermis that allow carbon dioxide, water, and oxygen to diffuse into and out of the leaf
Gas Exchange the process of leaves breathing in carbon dioxide and "exhaling" oxygen
Guard cells regulate movement of gases such as water vapor and carbon dioxide into and out of the leaf tissue
Meristems regions of unspecialized cells in which mitosis produces new cells ready for differentiation
Apical meristems found in places of rapid division – tips of the stems and roots
Trichomes hairlike projections that reduce evaporation and contain toxins
Created by: Elijher