A) Pollen grains X and V were brought to the stigma earlier, therefore, their germination inhibited the germination of pollen grain Z.
B) Pollen grain Z was brought to the flower by wind, while pollen grains X and Y were brought to the flower by insects.
C) Pollen grain Z lacks protrusions that allow it to adhere properly onto the stigma surface.
D) Pollen grain Z comes from a flower of an incompatible species.
Correct Answer: D
Solution :
Pollen grains can only germinate if the pollen grain and stigma are compatible, i.e., of the same or closely related species, Pollen grains X and Y must have come from a compatible species. Only compatible pollen grains germinate and form pollen tubes.
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