5.4.2 Use of Plant Hormones

How is auxin used as a weedkiller?

It is synthesised to affect broad-leaved plants (weeds), causing uncontrolled cell growth and plant death.

How is auxin used as rooting powder?

Auxin stimulates root growth when applied to cuttings, allowing new plants to grow quickly.

How is auxin used in tissue culture?

Plant cells in a growth medium with auxins form roots and shoots, allowing cloning of plants with desirable features.

How is ethene used in food production?

It controls ripening of fruit, reducing damage during transport and ensuring ripening happens at the right time.

How does ethene reduce food waste?

It ensures fruit ripens when needed, making more fruit suitable to be sold and not too early.

What are gibberellins used for in seed dormancy?

They end seed dormancy, allowing barley seeds to germinate in brewing to produce malt.

What are gibberellins used for in flowering?

They promote flowering without specific environmental conditions, producing bigger flowers.

What are gibberellins used for in fruit size?

They increase fruit size; seedless fruits sprayed with gibberellins grow larger.