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AP Biology Practice Questions

Category - Biology

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In humans, if an egg is not fertilized, which of the following occurs?

Menstruation
Ovulation
Spike in estrogen levels
Spike in progesterone levels
Buildup of uterine wall

Explanation

Answer: A, Menstruation. If the egg is not fertilized, it is flushed out of the body in a process called menstruation.

Key Takeaway: When the egg is not fertilized, it is flushed away along with the uterine wall during menstruation. Choices B-E are all related. During ovulation, a new egg is released. It is supported by a buildup of the uterine wall, which is stimulated by spikes in estrogen and projesterone.

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