Zygote pollen embryo Reproductive organ gametes reproduction Stigma ovule male fertilization fusion The flower is the 1 in flowering plants._2 . have structures that produce the 3. necessary for 4 Once 5 gets transferred to the 6. the_7. gametes from pollen grains release and B with egg in the 9 to form a 10. This process of 11 of gametes called 12. The zygote thus formed, divides and develops into and 13. and later into a 14. The ovary develops into a 15.