If a pollen grain lands on the stigma of a plant of a different species
A. the pollen grain would be unable to form a generative cell.
B. the pollen would likely not attach to the stigma.
C. the pollen grain may not be able to germinate.
D. the pollen grain would be too large or too small to enter the stigma.
E. the pollen grain would be ejected from the stigma.
Answer: C
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