Establish a seed formation sequence.

For the formation of seeds in flowering plants, it is necessary that pollen gets on the stigma of the pistil, that is, pollination occurs. After that, the pollen germinates in the form of a pollen tube to the ovary of the pistil, where gametes merge – this is fertilization, as a result of which a zygote is formed.
Correct sequence:
1-transfer of pollen from the stamen to the stigma of the pistil
2- pollination
3- fertilization
4- the formation of a zygote.