Flashcards · Biology · Plant Hormones
Use of Plant Hormones (Higher tier)
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How are auxins used as weed killers?
They make broad-leaved weeds grow too fast, so they die.
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Why is an auxin weed killer selective?
It kills broad-leaved weeds, but does not harm narrow-leaved crops or grass.
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How are auxins used in rooting powder?
They make cuttings grow roots quickly.
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How are auxins used in tissue culture?
They promote the growth of new plants from small pieces of tissue.
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How is ethene used in the food industry?
To control the ripening of fruit during storage and transport.
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Why are some fruits picked unripe?
They are firm, so they are not damaged during transport.
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How are gibberellins used on seeds?
To end dormancy, so that they germinate.
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How are gibberellins used on plants?
To promote flowering and to increase the size of fruit.
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What is horticulture?
The growing of fruit, vegetables, flowers and garden plants.
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How can weed killers reduce biodiversity?
They kill plants that support insects and birds.
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How can weed killers harm streams?
They can be washed off by rain into the water.
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What is a clone?
A genetically identical copy.
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Why must tissue culture be sterile?
To prevent the growth of bacteria and fungi.
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How can fruit be stored for longer?
Keep it cold and remove the ethene.
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Name an advantage of using plant hormones.
Higher yields, even ripening, or many identical plants.
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Common mistake about auxin weed killers?
Saying they kill all plants. They kill broad-leaved weeds.