| A | B |
|---|
| stomata | Animal-like protists |
| guard cell | One of the cells that surround a stoma and control the opening and closing of the stoma. |
| transpiration | The release of water from leaves through stomata. |
| palisade layer | The leaf tissue that consists of closely packed, tall, thin cells that carry on the majority of the photosynthesis. |
| spongy layer | Leaf tissue consisting of loosely packed cells that carry on photosynthesis. |
| hormone | chemical produced by living cells and transported to other body tissues where it causes specific effects. |
| tropism | The growth of plants in response to external stimuli such as light, gravity or contact. |
| phototropism | The growth of a plant part in a certain direction in response to light. |
| gravitropism | The growth of a plant part in a certain direction in response to gravity. |
| photoperiodism | Response of a plant to changes in the length of daylight and night. |
