AP BIOLOGY

Detailed explanation-1: -Final answer: Fertilisation occur in ovary of flowering plant.

Detailed explanation-2: -When the pollen tube reaches an ovule, it releases the male gametes. Male cells are released into the ovule for the fertilization with the female egg cell and thus the zygote is formed. After this process of fertilization, the ovary develops into fruit and ovule into seeds.

Detailed explanation-3: -Fertilization usually takes place in a fallopian tube that links an ovary to the uterus. If the fertilized egg successfully travels down the fallopian tube and implants in the uterus, an embryo starts growing.

Detailed explanation-4: -The pollen tube penetrates the style and reaches the ovary. Male nucleus is transferred through this pollen tube. Finally, fusion of male and female nuclei takes place inside the ovary. This step is called fertilization.

Detailed explanation-5: -Pistil: The part of the flower which contains the ovary is called Pistil. It comprises style, stigma, and ovary. The ovary in flowering plants is a part of the female reproductive structure of the gynoecium.