AP BIOLOGY

Detailed explanation-1: -Once the pollen lands on the right stigma, the pollen grain absorbs moisture and germinates forming a pollen tube. This pollen tube enters the stigma by crushing the cells and travels through the style and enters the ovule that is in the ovary.

Detailed explanation-2: -After pollen lands on the stigma, it initiates pollen tube formation. Pollen tubes are channels which grow down the length of the style to the ovules. After a pollen grain travels down a pollen tube it intercepts an ovule, fertilizes the female germ cells and initiates seed development.

Detailed explanation-3: -1 Pollen grains land on the stigma and begin to grow pollen tubes. Sperm cells within the pollen grain move down the pollen tube and into an ovule.