1. Pollination: Humans can manually pollinate plants, especially those that rely heavily on insects for pollination. This is particularly important for agricultural crops and for preserving rare plant species. This can be done through techniques like hand-pollination or by using artificial pollinators like bees.

2. Propagation: Humans can propagate plants through various techniques like cuttings, grafting, and tissue culture. This allows for the rapid production of identical copies of desirable plants, preserving their genetic traits and ensuring a reliable supply of seeds, fruits, or flowers.