B1- Controlling Plant Growth Flashcards
What do plant hormones control
The growth of shoots and roots
Flowering and the ripening of fruits
What are auxins and what do they respond to
They are a plant hormone that affect the plants growth by responding to gravity.
What is geotropism
When a plant respond to gravity.
Negative geotropism is when the shoots grow against gravity, positive is when they roots grow downwards in the way of gravity to absorb water
What is phototropism
When a plant responds to light.
Negative is when the roots grown away from light.
Positive is when the shoots grown towards light.
Where is auxin made
In the shoot tip
What are commercial uses of plant hormones
Rooting powder- encourages the growth of roots in stem cuttings so many plants can be obtained from one plant.
Fruit ripening hormone- cusses fruit to ripen, can be sped up or slowed down if required for transportation.
Selective weeds killers- the hormone disrupts the growth pattern in the plant without harming other plants.this causes the bigger leaves to receive a bigger dose of the hormone and die
