Ethene is used to control the ripening of fruit, ensuring each batch ripens at the same rate, reducing wastage during transport, and increasing shelf life.

Ethene is also used to promote fruit dropping in some plants, facilitating easier harvest.

Hormone rooting powder is a substance that contains auxin.

The application of hormone rooting powders to cut shoots stimulates the production of roots, making it easier to propagate new plants from plant cuttings.

Micropropagation is a process where new plants are mass produced from small tissue samples of the original plant.

Synthetic auxins are absorbed by weeds, which are typically broad-leaf plants, and affect their metabolism. The growth rate increases and becomes unsustainable, so the plants die.

1. Simple and cheap to produce
2. Low toxicity to mammals
3. Selective, affecting only broad-leaf plants

Auxins can be used to stimulate the development of fruit without the need for fertilisation, resulting in seedless fruit.

1. Control fruit ripening
2. Propagate new plants
3. Kill weeds
4. Produce seedless fruit
5. Promote fruit dropping
6. Prevent ageing of ripened fruit
7. Improve the size and shape of fruits

Cytokinins are used to prevent the ageing of ripened fruit, keeping them fresh for longer.

Gibberellins are used to stimulate the growth of fruits, resulting in larger and more uniformly shaped fruits.