Selective weedkillers kill some plants but not others.
This can be useful for getting rid of dandelions in a lawn without killing the grass.
How does it work
The selective weedkiller contains a growth hormone that causes the weeds to grow too quickly.
The weedkiller is absorbed in larger quantities by the weeds than it is by the beneficial plants. 
Controlling fruit ripening
Some hormones slow the ripening of fruits and others speed it up.
These hormones and their inhibitors are useful for delaying ripening during transport or when fruit is displayed in shops. 
For example bananas, farmers collect them when they are green.
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