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# Pollen Tube Growth and Function **Maturation:** During maturation, the generative cell moves inside the tube cell, becoming a free-standing cell. **Sperm Delivery by Pollen Tubes:** **Pollination:** The microsporangium breaks open, releasing pollen grains. A pollen grain is transferred to the s...

# Pollen Tube Growth and Function **Maturation:** During maturation, the generative cell moves inside the tube cell, becoming a free-standing cell. **Sperm Delivery by Pollen Tubes:** **Pollination:** The microsporangium breaks open, releasing pollen grains. A pollen grain is transferred to the stigma during pollination. **Pollen Tube Growth:** - The pollen grain absorbs water and germinates, forming a pollen tube that delivers sperm to the female gametophyte. - The pollen grain consists of: - The spore wall - Two cells: the tube cell and the generative cell (inside the tube cell) **Sperm Formation:** - As the pollen tube elongates through the style, the generative cell nucleus divides by mitosis, producing 2 sperm. - The tube nucleus guides the pollen tube toward the micropyle, responding to chemical signals from the synergid cells.