What Happens When Pollen from One Species Lands on the Stigma

question 19

Multiple Choice

What happens when pollen from one species lands on the stigma of a flower from another species?

• A) The pollen tube typically forms and grows to the ovary, but then stops.
• B) The pollen tube typically forms, but the sperm are killed.
• C) The pollen tube typically forms, but the sperm cannot penetrate the egg.
• D) The pollen tube typically does not develop.

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