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23.1 & 23.4
Question | Answer |
---|---|
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 |