What Are the Roles of Abscisic Acid (ABA)and Gibberellins in Seed

question 133

Multiple Choice

What are the roles of abscisic acid (ABA) and gibberellins in seed germination? Select the TWO answers that are correct.

• A) When the amount of abscisic acid decreases,a seed begins to come out of dormancy.
• B) Levels of both gibberellin and abscisic acid must be high to initiate seed germination.
• C) Increasing gibberellin levels signal that conditions are favorable for seeds to germinate.
• D) Seeds germinate when gibberellin levels decline as days shorten and temperatures drop.
• E) Rising levels of abscisic acid make the seed coat split so the young plant can emerge.

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