Flashcards · Biology · Plant Adaptations and Hormones
Commercial Uses of Plant Hormones (Higher tier)
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Why are auxin weedkillers selective?
Broad-leaved weeds take them up and die, but narrow-leaved crops are not harmed.
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How do auxin weedkillers kill weeds?
They make the weed grow too fast and die.
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What does rooting powder contain?
A synthetic auxin.
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What does rooting powder do?
Makes cuttings grow roots quickly.
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What do gibberellins do to seeds?
End dormancy, so that they germinate.
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Why is it useful for seeds to germinate together?
The crop grows at the same rate and can be harvested at the same time.
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What do gibberellins do to flowers?
Bring on the formation of flowers.
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How are seedless grapes made?
They are sprayed with gibberellin so they grow without seeds and larger.
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What is ethene?
A gas made by plants, which makes fruit ripen.
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Why are bananas picked green?
They are firm, so they are not damaged in transport.
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How are green bananas ripened?
They are exposed to ethene gas.
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How can ripening be delayed?
Store the fruit cool, and remove the ethene.
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What is an advantage of using hormones in farming?
More uniform crops, more yield, or planned harvests.
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What is a disadvantage of weedkillers?
They can wash into streams and harm wildlife.
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What is a clone?
A genetically identical copy, such as a plant grown from a cutting.
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Common mistake about ethene?
Saying it is a solid. It is a gas, which is made by plants.