Plant Hormones Flashcards
Why do plants produce hormones?
- Plants produce hormones to co-ordinate and control responses to light and gravity.
What is the response to light (by growth/ movement) called in plants?
- Phototropism.
What is the response to gravity (by growth/ movement) known as in plants?
2 different KEYWORDS
1.) Gravitropism.
2.) Geotropism
What is meant by “seed germination?”
- When a seed becomes a plant.
Why are gibberellins (a hormone) important in plants?
- Gibberellins are important in initiating seed germination.
What does ethene (a hormone in plants) control?
- Ethene controls cell division and ripening of fruits.
What are responses to light and gravity controlled by in plants?
- Responses to light/ gravity are controlled by the hormone: auxin.
What is the difference between agriculture and horticulture?
- Agriculture: growing food crops/ could include animals.
- Horticulture: growing plants for gardens.
What are the 3 main uses of auxins in agriculture and horticulture?
1.) Auxins are used as weed killers.
2.) as rooting powders (powders to put cuttings of plants in.)
3.) for promoting growth in tissue cultures (promoting growth of cuttings…)
() - extra info for understanding…
What are the 3 main uses of gibberellins?
1.) Gibberellins can be used to end seed dormancy (encourage a seed to geminate into a plant quickly.)
2.) Giberellins can be used to encourage flowering.
3.) Giberellins can be used to increase fruit size.
What is ethene used for in agriculture?
- Ethene is used to control the ripening of fruit during storage and transport.
- Ie. fruits may be harvested before they are ripe. Ethene would be used to trigger the fruit to ripen just before it is sold.
What causes unequal growth rates in plant roots and shoots?
- Unequal distributions of auxin cause unequal growth rates in plant roots/ shoots.
- This will allow the plant roots/ shoots to move and change shape - responding to gravity/ light.
