- Each of the microscopic particles, typically single cells, of which pollen is composed. Pollen grains have a tough coat that has a form characteristic of the plant producing it.More example sentences
- The pollen grain is the male gametophytic phase of flowering plants.
- The pollen grain (male gametophyte) is a three-celled structure composed of two generative cells encased within the vegetative cell.
- The transfer of the pollen grain (male gametophyte) from the stamen to the stigma initiates the processes that can result in fertilization.