Plant Hormones in Agriculture Flashcards

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Which plant hormone is used in many selective weedkillers for lawns and cereal crops?

Auxin. It kills broad-leaved weeds but leaves grasses and cereals alive.

How do auxin weedkillers kill broad-leaved weeds?

They make the weeds grow too fast in an uncontrolled way, so the weeds die.

What is the purpose of adding auxins to rooting powder?

Auxins in rooting powder help plant cuttings grow new roots quickly, so more young plants survive.

How are gibberellins used to control seed germination in farming?

Gibberellins are sprayed on seeds to end dormancy, so many seeds germinate at the same time.

How can gibberellins be used to increase fruit yield?

Gibberellins can make fruits such as grapes grow larger, so the crop has more usable food.

Why might gardeners use gibberellins on ornamental plants?

Gibberellins can make these plants flower earlier or at chosen times, so flowers are ready for sale on special dates.

Which plant hormone gas do fruit companies use to control when fruit ripens?

Ethene, a plant hormone gas, is used to speed up fruit ripening.

Why are some fruits picked while still hard and unripe, then treated with ethene?

They stay firm and do not rot during transport. Ethene is added later so they ripen just before being sold.

How does using ethene reduce food waste in shops and warehouses?

Ethene lets workers control the timing of ripening, so less fruit becomes over-ripe and has to be thrown away.

Overall, how do plant hormones help increase food production in agriculture?

They help farmers control weed growth, seed germination, flowering and fruit ripening, so crop yield and quality are higher.

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