| A | B |
|---|
| abcission | the separation of a leaf from a plant |
| bipinnately compound | leaves that are twice divided |
| blade | broad flat part of a leaf |
| bundle sheath | layer of cells surrounding a leaf vein |
| compound leaf | leaf divided into separate parts called leaflets |
| deciduous | woody plants that lose their leaves at the end of the growing season |
| epidermis | outer layer of cells in leaves |
| guard cell | bean shaped cell located around the stomata |
| leaf | the plant organ in which photosynthesis occurs |
| leaflet | one of the divisions found in a compound leaf |
| mesophyll | tissue between the upper and lower epidermis of a leaf |
| needle | long, stiff leaf found, for example, in pine trees |
| palisade layer | tissue of leaf mesophyll that consists of elongated cells containing chloroplasts |
| palmate venation | leaf venation in which the veins spread out in a net like pattern |
| palmately compound | leaf with leaflets attached to a single petiole |
| parallel venation | the arrangement of leaf veins found in monocot plants in which there are several parallel veins of approximately the same size |
| parenchyma | tissue made up of thin walled, loosely packed cells that form cortex and pith |
| petiole | the stalk by which a leaf is attached to a stem |
| photoperiodism | response in plants to changing periods of light and darkness |
| pinnate venation | leaf venation in which one large vein runs the length of the blade with small veins branching from it to the edge |
| pinnately compound | leaves that have leaflets attached along both sides of the petiole |
| sesile leaf | leaf without a petiole |
| simple leaf | leaf with one blade and one petiole |
| spine | specialezed leaf of a cactus adapted to a desert environment |
| spongy layer | tissue of the leaf mesophyll found between the palisade layer and the lower epidermis |
| stoma | leaf pore that regulates the passage of gases and water vapor |
| stomata | plural of stoma |
| tendril | specialized leaf that wraps around a solid object and helps to support a climbing plant |
| touch response | quick movement of plant parts when they are touched |
| turgor pressure | pressure that builds up in cells as water travels through osmosis |
| venation | the arrangement of veins in a leaf |
