B3.2.7 Uses of Plant Hormones Flashcards

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1
Q

Function of auxin

A

Stimulate growth by causing cell elongation
Also help to regulate fruit development
Without auxins fruit are often too small

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2
Q

Function of ethene

A

Causes plant fruits to ripen by stimulating the conversion of starch into sugar
This is why a ripe fruit tastes sweeter than an unripe one
The only plant hormone that exists as a gas

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3
Q

Gibberellins function

A

Promote growth, particularly stem elongation
End dormancy periods of seeds and buds
This leads to shoots and flowers opening

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4
Q

How is auxin used as weed killer

A

Auxin weed killer makes the weeds grow too fast
This rapid uncontrolled growth kills the plant

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5
Q

How do auxin promote root growth

A

Rooting powder contains auxin
Gardeners use auxin to produce identical plants from cuttings
They cut off a plant from a shoot, dip it into rooting powder and plant it
After a few days, rooots develop from the cut stem
The new roots anchor into the soil and take up water and minerals

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6
Q

How does auxin delay ripening

A

Sprayed on fruit trees
Allows a harvest to all be collected at the same time
Can prevent fruit from dropping too early

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7
Q

How is ethene used to ripen fruit

A

Sprayed onto fruit trees and plants so their fruits ripen quicker
Allows fruit to be ready earlier in the growing season

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8
Q

How do auxins produce seedless fruit

A

Seeds are produced after a plant is pollinated by insects or the wind
If auxins are applied to unpollinated flowers, the plant produces seedless fruit

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9
Q

How do gibberellins / auxins control dormancy

A

Seeds remain dormant until conditions are ideal for growth so they don’t germinate at the end of summer
Commercial growers trigger seed germination in winter by spraying them with g/a in the greenhouse

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