What term describes the union of pollen and stigma?

• A. Fertilization
• B. Pollination
• C. Grafting
• D. Planting

Answer: (B)

The term that describes the union of pollen and stigma is pollination. This process is essential for plant reproduction, where pollen grains from the male part of the flower (the anther) are transferred to the female part (the stigma). Pollination can occur through various agents, including wind, water, insects, and animals, which help facilitate the transfer of pollen.

Understanding pollination is crucial because it leads to fertilization, where the sperm cells within the pollen fuse with the ovules in the ovary, resulting in seed formation. This distinction is important since fertilization fundamentally involves the genetic union at a deeper level than the initial transfer of pollen to the stigma.

The other options refer to different processes in plant cultivation and reproduction. Grafting involves joining two plants together; planting refers to the act of placing seeds or seedlings in the soil; while fertilization, although related to the reproductive process, follows pollination. Therefore, pollination is the correct term for the union of pollen and stigma, setting the stage for the subsequent steps in plant reproduction.