Final answer:
Pollination is the term that best describes when a grain of pollen from an anther is placed on a stigma. It is an essential step in plant reproduction.
Step-by-step explanation:
Pollination is the term that best describes when a grain of pollen from an anther is placed on a stigma. Pollination is an important step in the reproductive process of plants. It allows for the transfer of pollen, which contains the male gametes, to the female reproductive organs, leading to fertilization and the development of seeds and fruits.
Learn more about Plant Reproduction