What Happens When Pollen from One Species Lands on the Stigma

question 23

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 does not develop.
• D)The pollen tube typically forms, but the sperm cannot penetrate the egg.

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Definitions:

Reproductive Intervention

Medical and technological procedures aimed at aiding individuals or couples in conceiving and sustaining pregnancies.

Episiotomy

An incision sometimes made to increase the size of the opening of the vagina to allow the baby to pass.

Induced Labor

A medical procedure used to stimulate uterine contractions before natural labor begins, for various health reasons concerning the mother or baby.

Braxton-Hicks Contraction

Irregular, often painless contractions that occur during pregnancy as the uterus prepares for childbirth; sometimes referred to as "false labor."