You are correct; the alternation of generations in plants involves both mitosis and meiosis.
In this life cycle, there are two main phases: the haploid gametophyte generation and the diploid sporophyte generation.
- Mitosis occurs in the gametophyte generation to produce gametes (sperm and egg cells) and also occurs in the sporophyte generation to produce spores.
- Meiosis occurs in the sporophyte generation to produce haploid spores from diploid cells.
Thus, the correct answer is: 1. Both mitosis and meiosis.