Unlike animals, plants are immobile and cannot actively seek out partners for reproduction. The first plants were aquatic and used abiotic factors, like water and wind, to carry male gametes to female reproductive structures. As plants moved from water onto land, they developed motile sperm cells that could travel via a thin film of water. Eventually, many plants evolved the pollen and seed structures common today. How do some plants attract the insect pollinators vital to their reproduction? Discuss
Source: The Free Dictionary