Final answer:
The process by which plants produce both self-pollinating flowers and flowers pollinated by insects is known as cross-pollination. It is facilitated by pollinators and increases genetic diversity in plant species.
Step-by-step explanation:
The type of pollination described, where plants produce both self-pollinating flowers and flowers that are pollinated by insects, is termed cross-pollination. This process involves the transfer of pollen from one flower to another flower on a different plant of the same species, often with the aid of pollinators such as bees, butterflies, or other insects. Cross-pollination enhances genetic diversity within a species and is a key factor in the adaptation and evolution of angiosperms. On the other hand, self-pollination occurs when a flower's pollen fertilizes the ovules in the same flower, or a different flower of the same plant, leading to offspring genetically identical to the parent plant.