Definition
A pollen tube is a long, slender tube produced by a pollen grain when it lands on the stigma of a flower. It's like a tiny, guided missile 🚀 delivering sperm cells to the ovule. The pollen tube grows down the style of the flower, acting as a pathway. Its sole purpose is to transport the male genetic material for fertilization. It's a crucial step in plant reproduction for flowering plants. Without it, there would be no seeds or fruits.