| Term | Definition |
|---|
| Chemical Formula | synthesis of compounds with the aid of radiant energy (especially in plants), a representation of a substance using symbols for its constituent elements |
| Balanced Equation | each side of the equation has the same number of atoms of each element and mass is conserved |
| Limiting Factor | factor that causes the growth of a population to decrease |
| Light Intensity | luminous intensity measured in candelas |
| Concentration | the strength of a solution |
| Greenhouse | a building with glass walls and roof |
| Dicotyledonous Leaf | A name for a group of flowering plants whose seed typically has two embryonic leaves or cotyledons. |
| Mesophyll Cells | A loosely arranged photosynthetic cell located between the bundle sheath and the leaf surface. |
| Palisade Cells | Oblong cells in leaves that are located directly under the upper epidermis and contain chloroplasts |
| Gaseous Exchange | the movement of oxygen into the blood and cells, the movement of carbon dioxide in the reverse direction" |
| Vascular Bundles | trands of xylem and phloem in a leaf stem; part of the transport system in vascular plants |
| Nitrate Ions | any compound containing the nitrate group (such as a salt or ester of nitric acid) |
| Magnesium Ions | are needed to make chlorophyll. |
| Transpiration | the emission of water vapor from the leaves of plants |
| Water Vapour | water in a vaporous form diffused in the atmosphere but below boiling temperature |
| Humidity | wetness in the atmosphere |
| Wilting | causing to become limp or drooping |
| Transpiration Stream | Causes water to be pulled up the xylem |
| Adaptations | the behaviors and physical characteristics that allow organisms to live successfully in their environments |
| Systemic Pesticide | Absorbed and circulated by a plant or other organism so as to be lethal to pests that feed on it. |
| Sunlight | the rays of the sun |
| Lamina | a thin plate or layer (especially of bone or mineral) |
| Petiole | the slender stem that supports the blade of a leaf |
| Veins | blood vessels that carry blood back to the heart |
| Epidermis | the outer layer of the skin covering the exterior body surface of vertebrates |
| Cuticle | hard outer covering or case of certain organisms such as arthropods and turtles |
| Guard Cell | Pairs of cells that surround stomata and control their opening and closing. |
| Stomata | the small openings on the undersides of most leaves through which oxygen and carbon dioxide can move |
| Palisade Layer | the layer of cells in a leaf where most photosynthesis occurs |
| Spongy Layer | Moist, loosely packed layer of cells containing chloroplasts. |
| Oils | Lipids that are liquid at room temperature |
| Herbaceous Plants | non woody plants with a soft stem |
| Lignin | a complex polymer |
| Sieve Tube Elements | found in phloem; stacked end to end; have holes so materials can get in and out of the phloem |
| Sieve Plates | An end wall in a sieve-tube member, which facilitates the flow of phloem sap in angiosperm sieve tubes. |
| Root Cap | thimble-shaped mass of cells covering and protecting the growing tip of a root |
| Potometer | The device used to measure the amount of transpiration occurring from a plant |
| Transpiration Rate | the process of givng off or exhaling water vapor through the skin or mucous membranes |
| Passive Transport | transport of a substance across a cell membrane by diffusion |
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