Final answer:
Plants undergo alternation of generations, alternating between a diploid sporophyte generation and a haploid gametophyte generation. This allows for both sexual and asexual reproduction.
Step-by-step explanation:
All plants undergo alternation of generations, which means they alternate between a diploid sporophyte generation and a haploid gametophyte generation. The sporophyte generation is diploid and produces spores through meiosis, while the gametophyte generation is haploid and produces gametes through mitosis. This alternation allows plants to reproduce both sexually, through the fusion of gametes, and asexually, through the production of spores.