Plant hormones - uses

Plant hormones - uses

Auxin - Rooting powder

• Auxin stimulates root growth

• Used in root powder

• Stimulates roots to grow from plant cuttings

• Genetically identical plants can be grown quickly, on large scale

Auxin - Selective weedkiller

• Artificial auxin makes plants grow uncontrollably

• Only target broad leaved plants

• Narrow leaved plants (grass) are not affected

• Selective weedkiller

Multiple Select

What can auxin be used for in industry?

• Increase fruit yeild

• Rooting powder

• Pest resistant

• Selective weedkiller

Multiple Choice

Why is auxin used as a rooting powder?

• Increase fruit development

• Provide greater intake of mineral ions

• Stimulate root growth from stem cuttings

Multiple Choice

Which plant would be targeted by auxin?

Gibberellins

• Cause seed germination

• Adding gibberelins can make seeds germinate all year round

Gibberellins

• Make plants flower out of season

• Flowers can be available all year round

Gibberellins

• Fruit develops without fertilisation

• Seedless fruit

Gibberellins

• Increase the size of fruit

• Increases space for fruit on the stem to grow bigger

Multiple Choice

Adding gibberellins can cause seeds to germinate in winter.

• True

• False

Multiple Choice

Adding gibberellins will allow flowers to be produced out of season.

• True

• False

Multiple Choice

How does gibberellin increase the size of fruit?

• Allows them to take in more water

• The plant synthesises sucrose more

• The distance between each fruit is increases

• Increases phloem concentration to transport more sugars to fruit.

Ethene

• This hormone causes plants to ripen

• Some exotic fruits need to be transported long distances so are picked un-rippened

• Spraying them with ethene in transit ripens them in time for them to be sold

Open Ended

Supermarkets sell 'just ripened' apples all year round, although apples are traditionally harvested in autumn.

Explain how this is possible.