| A | B |
|---|
| annual | plant that completes its life cycle during one growing season |
| apical dominance | the inhibition of lateral bud growth by auxin produced in the terminal bud |
| apical meristem | meristem in the tips of stems and roots |
| auxin | A class of plant hormones that stimulates cell elongation, secondary growth, and leaf and fruit development and inhibits lateral bud growth |
| biennial | plant that completes its life cycle within two years |
| cork cambium | Lateral meristem of woodt plants that produces cork cells of the outer bark |
| cytokinin | Plant hormone produced in root tips that stimulate cell division |
| day-neutral plant | Plant whose flowering cycle is not affected by day length |
| deciduous | Describes trees, shrubs, and woody vines that drop all of their trees at the end of each growing season |
| differentiation | Process in which the cells of of a multicellular individual become specialized during development |
| dormancy | Condition in which a seed or plant remains inactive for a period of time |
| ethylene | Plant hormone that causes fruit ripening |
| evergreen | Trees, shrubs, and woody vines that drop only a few leaves at a time throughout the year |
| germination | Resumption of growth by a plant embryo |
| gibberellin | Type of plant hormone that regulates growth, especially stem elongation |
| gravitropism | Growth response to gravity |
| hormone | Chemical produced in one part of an organism and then transported to another part of the organism, where it causes a response |
| lateral meristem | meristem that produces secondary growth in woody plants; vascular combium or cork cambium |
| long-day plant | plant that produces flowers when days become longer than a critical length |
| nutrient | mineral element extracted from the soil by plants |
| perrenial plant | plant that lives for more than two years and may produce flowers, fruits, and seeds many times during its life |
| photoperiodism | response of a plant to the length of days and nights |
| phototropism | growth response to light |
| primary growth | growth that occurs from the formation of new cells at the tips of plants |
| primary tissue | plant tissue that results from primary growth |
| secondary growth | growth that causes a plant to increase its circumference |
| secondary tissue | plant tissue that develops as a result of secondary growth |
| seedling | a young plant soon after germination |
| short-day plant | plant that flowers when days become shorter than a critical length |
| thigmatropism | growth response to touch |
| tissue culture | technique for growing pieces of living tissue in artificial media |
| tropism | growth response in which the direction of growth is determined by the direction from which the stimulus comes |
| vascular cambium | lateral meristem of woody plants that produces secondary vascular tissue |
