| A | B |
|---|
| phloem | The vascular tissue through which food moves in some plants. |
| xylem | The vascular tissue through which water and nutrients move in some plants. |
| seed | The plant structure that contains a young plant inside a protective covering. |
| embryo | The young plant that develops from a zygote. |
| cotyledon | A seed leaf that stores food. |
| germination | The early growth stage of the embryo plant in a seed. |
| stomata | The small openings on the undersides of most leaves through which oxygen and carbon dioxide can move. |
| transpiration | The process by which water is lost through a plant's leaves. |
| cambium | The layer of cells in a plant that produces new phloem and xylem cells. |
| root cap | A structure that covers the tip of a root, protecting the root from injury. |
| gymnosperm | A plant that produces seeds that are not enclosed by a protective covering. |
| cone | The reproductive structure of a gymnosperm. |
| pollen | Tiny particles produced by plants that contain the microscopic cells that later become sperm cells. |
| ovule | A plant structure in seed plants that contains an egg cell. |
| pollination | The transfer of pollen from male reproductive structures to female reproductive structures in plants. |
| angiosperm | A plant that produces seeds that are enclosed in a protective structure. |
| ovary | A protective structure in plants that encloses the developing seeds. |
| flower | The reproductive structure of an angiosperm. |
| petal | The colorful, leaflike structures of a flower. |
| sepal | A leaflike structure that encloses the bud of a flower. |
| stamen | The male reproductive parts of a flower. |
| pistil | The female reproductive parts of a flower. |
| fruit | The ripened ovary and other structures that enclose one or more seeds of an angiosperm. |
| monocot | An angiosperm that has only one seed leaf. |
| dicot | An angiosperm that has two seed leaves. |
| tropism | The growth response of a plant toward or away from a stimulus. |
| hormone | A chemical that affects growth and development. |
| auxin | The plant hormone that speeds up the rate of growth of plant cells. |
| genetic engineering | The process of altering an organism's genetic material to produce an organism with qualities that people find useful. |
| hydroponics | The method of growing plants in a solution of nutrients instead of soil. |
