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| Concentration of growth at the tip of a plant shoot, where a terminal bud partially inhibits axillary bud growth. |
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| The stalk of a leaf, which joins the leaf to a node of the stem. |
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| Dermal Tissue (epidermis) |
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Definition
| The protective covering of plants; generally a single layer of tightly packed epidermal cells covering young plant organs formed by primary growth. |
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| A waxy covering on the surface of stems and leaves that acts as an adaption to prevent desiccation in terrestrial plants. |
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| Plant tissue consisting of cells joined into tubes that transport water and nutrients throughout the plant body. |
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| A type of plant cell that is connected to a sieve-tube cell by many plasmodesmata and whose nucleus and ribosomes may serve one or more adjacent sieve-tube cells. |
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| A water-conducting and supportive element of xylem composed of long, thin cells wit tapered ends and walls hardened with lignin. |
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| A specialized short, wide cell in angiosperms; arranged end to end, they form continuous tubes for water transport. |
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| A chain of living cells that form sieve tubes in phloem. |
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| In a plant, a pore in the end wall of a sieve-tube member through which phloem sap flows. |
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| A plant that completes its entire life cycle in a single year or growing season. |
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| A plant that lives for many years. |
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| A tissue of mostly parenchyma cells that makes up the bulk of a young plant and fills the space between the dermal and vascular tissue systems. |
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| A relatively unspecialized plant cell type that carries most of the metabolism, synthesizes and stores organic products, and develops into a more differentiated cell type. |
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| A flexible plant cell type that occurs i strands or cylinders that support young parts of the plant without restraining growth. |
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Definition
| A rigid, supportive plant cell type usually lacking protoplasts and possessing thick secondary walls strengthened by lignin at maturity. |
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| Plant tissue that remains embryonic as long as the plant lives, allowing for indeterminate growth. |
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| A cone of cells at the tip of a plant root that protects the apical meristem. |
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| The zone of primary growth in roots consisting of the root apical meristem and its derivatives. New root cells are produced in this region. |
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| The region of the root tip adjacent to the zone of cell divison. Cells sometimes elongate to more than ten times their original length |
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| The region of the root tip adjacent to the zone of cell elongation. As cells finish elongating, they begin to specialize in structure and function. |
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Definition
| A strand of vascular tissues (both xylem and phloem) in a plant stem. |
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| A microscopic pore surrounded by guard cells in the epidermis of leaves and stems that allows gas exchange. |
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Definition
| A specialized epidermal plant cell that forms the boundaries of the stomata. |
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| The ground tissue of a leaf, sandwiched between the upper and lower epidermis and specialized for photosynthesis. |
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| A continuous cylinder of meristematic cells surrounding the xylem and pith that produces secondary xylem and phloem. |
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| A cylinder of meristematic tissue in plants that produces cork cells to replace the epidermis during secondary growth. |
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| The force directed against a cell wall after the influx of water and the swelling of a walled cell due to osmosis. |
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Definition
| A water-impermeable ring of wax around endodermal cells in plants that blocks the passive flow of water and solutes into the stele by way of cell walls. |
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Definition
| The evaporative loss of water from a plant. (Transpiration) |
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Definition
| The upward push of water within the stele of vascular plants, caused by active pumping of minerals into the xylem by root cells. |
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Definition
| The exudation of water droplets, caused by root pressure in certain plants. |
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| A physiological cycle of about 24 hours that is present in all eukaryotic organisms and that persists even in the absence of external cues. |
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