Answer:
The correct order is:
Q: The pollen grain germinates on reaching the stigma.
S: The pollen tube grows out from the pollen.
P: The pollen tube grows down through the style reaches the ovary.
R The male gamete moves into the ovule to fuse with the ovum.
Step-by-step explanation:
The fertilization progress takes place in the order presented above. This process is responsible for the formation of fruits and seeds that will be responsible for giving continuity to the plant species. In a nutshell, we can say that fertilization starts with the polem road in stigma. There, the pollen will germinate and develop a tube called a pollen tube. This tube will grow to the flower's ovary and merge with the egg, completing fertilization.