| A | B |
|---|
| nitrogen fixation | process by which certain bacteria convert nitrogen gas to ammonia |
| legume | member of a group of plants that house their own nitrogen-fixing bacteria |
| root nodule | lump on a plant root that contains nitrogen-fixing bacteria |
| root hair | outgrowth of a root's epidermal cell that increases the surface area available for absorption |
| root pressure | force that helps push water up the xylem in a plant |
| endodermis | layer of cells surrounding a plant's vascular tissue |
| transpiration | evaporation of water from a plant's leaves |
| trachied | long cell with tapered ends that transports water in the xylem |
| vessel element | short, wide cell that transports water in the xylem of a plant |
| guard cell | one of a pair of cells that open and close the stoma of a plant by changing shape, allowing gas exchange with the surrounding air |
| sieve tube member | one of a chain of cells that forms a sieve tube, through which phloem sap flows in a plant |
| companion cell | cell found alongside a sieve tube in a plant that may provide resources to the sieve-tube members |
| pressure flow mechanism | process by which phloem sap moves through a plant |
| epiphyte | plant that grows on another plant and absorbs nutrients through rain that falls on its leaves |
