Practice question

Plant life cycles feature alternation heteromorphic where sporophyte and gametophyte differ markedly in size complexity ecological independence and morphology. In gymnosperms sporophyte extensive woody tree shrub producing sporangia inside cones via meiosis, while gametophytes highly vestigial reduced: male few cells within pollen wall exine intine, female haploid multicellular massive with archegonia inside ovule dependent entirely for nutrition water. Isomorphic alternation shows similar thallus morphology like Ulva sea lettuce, haplobiontic one multicellular generation dominant, asexual absence alternation entirely. Heteromorphic trait indicates evolutionary reduction gametophyte lineage promoting protection pollen seed dispersal advantages ultimately leading to seed habit dominance terrestrial environments globally.