When Pollen from One Species Lands on the Stigma of a Flower

question 49

Multiple Choice

When pollen from one species lands on the stigma of a flower from another species, the pollen tube typically ____.

• A) does not develop
• B) forms, but the sperm cannot penetrate the egg
• C) forms and grows to the ovary, but then stops
• D) forms, but the sperm are killed
• E) forms and the egg is usually fertilized, but the embryo rarely grows

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