Term | Definition |
gymnosperm | a wood, vascular seed plant whose seeds are not enclosed by an ovary or fruit |
angiosperm | a flowering plant that produces seeds within a fruit |
dermal tissue | the outer covering of a plant |
ground tissue | the type of plant tissue other than vascular tissue that makes up much of the inside of a plant |
vascular tissue | the specialized conductive tissue that is found in higher plants that is made up of mostly xylem and phleom |
xylem | the type of tissue in vascular plants that provides support and conducts water and nutrients from the roots |
phloem | the type of tissue that conducts food (sugars, amino acids, nutrients) in vascular plants |
cohesion-tension theory | theory that explains how the physical properties of water allow it to move through the xylem of plants |
transpiration | the process by which plants release water vapor into the air through stomata |
pressure-flow model | model for predicting how sugars are transported from photosynthetic tissues to the rest of the plant |
vascular cylinder | center of a root or stem that contains the vascular tissue |
primary growth | the growth that occurs as a result of cell division at the tips of stems and roots and gives rise to primary plant tissue |
secondary growth | growth that results from cell division in the cambia, or lateral meristems, and that cause the stems and roots to thicken |
blade | the broad, flat portion of a typical leaf |
petiole | the stalk that attaches a leaf to the plant |
mesophyll | in leaves, the tissue between epidermal layers, where photosynthesis occurs |
guard cell | one pair of specialized cells that boarder a stoma and regulate gas exchange |