| A | B |
|---|
| nocturnal | active only at night |
| sepal | flower organ that protects the bud |
| petal | colorful flower structure that attracts pollinators and provides them a landing place |
| stamen | male reproductive organ of most flowers composed of a filament and an anther |
| pistil | flower’s female reproductive organ; it is usually composed of a stigma, a style, and an ovary |
| Photoperiodism | flowering response of a plant based on the number of hours of darkness it is exposed to |
| short-day plant | plant that flowers in the winter, spring, or fall, when the number of hours of darkness is greater than the number of hours of light |
| long-day plant | plant that flowers in the summer, when there are fewer hours of darkness than the plant’s critical period |
| Intermediate-day plant | plant that flowers as long as the number of hours of darkness is neither too great nor too few |
| Day-neutral plant | plant that flowers over a wide range in the number of hours of darkness |
| stigma | the tip of a flower’s pistil where pollination occurs |
