Which of the following flower mechanisms would help prevent pollination by a foreign species?

Question

Quizplus · Accepted Answer

All of the mechanisms described (A-D) can contribute to reducing the chance of pollination by a foreign species. By having pollen tubes that only grow in the style of its own species (A), the chances of successful fertilization by foreign pollen are greatly reduced. If the stigma of a flower only sticks to its own species of pollen (B), it will prevent foreign pollen from fertilizing the ovules. With a variation in the timing of flowering (C), it becomes less likely that foreign pollen will be present when a flower is receptive to fertilization. Furthermore, if flowers attract a small number of specialized pollinators (D), these pollinators are less likely to visit flowers of a foreign species.

Which of the Following Flower Mechanisms Would Help Prevent Pollination