Plant hormones - uses

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

Artificial auxin makes plants grow uncontrollably

Only target broad leaved plants

Narrow leaved plants (grass) are not affected

Selective weedkiller

Cause seed germination

Adding gibberelins can make seeds germinate all year round

Make plants flower out of season

Flowers can be available all year round

Fruit develops without fertilisation

Seedless fruit

Increase the size of fruit

Increases space for fruit on the stem to grow bigger

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