Flashcards · Biology · Plant Hormones
Gibberellins and Ethene (Higher tier)
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What are gibberellins important in?
Initiating seed germination.
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What is seed dormancy?
A resting state in which the seed does not germinate.
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What does ethene control?
Cell division and the ripening of fruits.
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What state is ethene at room temperature?
A gas.
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Why does ethene spread between fruits?
It is a gas, so it moves through the air.
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What happens to fruit as it ripens?
It becomes softer, sweeter and changes colour.
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Why does one ripe fruit spoil others?
It makes ethene, which makes the others ripen.
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Do you need to know how gibberellins work?
No, the mechanism is not required.
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What other effects do gibberellins have?
Stimulate stem growth and flowering.
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Why does a seed need to be dormant?
To avoid germinating at the wrong time of year.
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What is a germination control?
Seeds treated in the same way but without the hormone.
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What does a fruit bag with ethene show?
That ethene makes fruit ripen faster.
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Why is ripening useful to the plant?
Animals eat ripe fruit, and carry the seeds.
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How is ripening slowed in stores?
Keep the fruit cold, and remove the ethene.
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Name the hormone that makes shoots elongate.
Auxin.
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Common mistake about ethene?
Saying it is a liquid. It is a gas.