This video segment adapted from NOVA explains how flowers play a central role in the reproductive cycle of plants. Their striking array of colors, patterns, fragrances, and nectar all require lots of ...

Many animals, including humans, are one sex, either male or female. Most flowering plants have both male and female reproductive structures, not only on the same plant, but often in the same flower.

Most people don't know this, but the cucumbers we buy in the supermarket are purely female - grown from plants which were carefully cross-bred to produce female-only flowers. But while farmers have ...