What part of a flower is known for being sticky and capturing pollen?

The stigma is the part of a flower that is specifically designed to be sticky in order to capture pollen. This structure is located at the top of the pistil, which is the female reproductive part of the flower. When pollen grains land on the stigma, they adhere to its surface due to its sticky texture, allowing for the process of fertilization to begin.

Once pollen is captured on the stigma, it can germinate and grow a pollen tube through the style, leading to the ovary where fertilization occurs. The unique adaptation of the stigma to be sticky is crucial for successful reproduction in flowering plants, as it enhances the chances of successful pollen transfer from the male part of the flower to the female part.

The other options refer to parts of the flower that have different roles; the filament supports the anther, which produces pollen, and the style connects the stigma to the ovary but does not have the sticky surface required for capturing pollen.