Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
Describe the direction that shoots grow in relating to things that they are sensitive to |
shoots are sensitive to light they grow towards light |
|
Describe the direction that roots grow in relating to the things that they are sensitive to |
roots are sensitive to gravity they grow towards the fore of gravity |
|
what is the name of hormones in plants |
auxin |
|
what i phototropism |
plant growth response to light |
|
describe how auxin causes phototropism |
plant growth response to light |
|
describe how auxin controls phototropism |
causes cell elongation in the shoot |
|
what is geotropism |
plant growth response to gravity |
|
describe how auxin controls geotropism |
stops cell elongation in the root |
|
what do negative and positive tropisms mean |
positive: towards the stimulus negative: away from the stimulus |
|
how can plant growth be used in agriculture |
selective weed killers auxin makes broad leaved plants grow out of control and die. rooting powder auxin makes cuttings develop roots quickly. seedless fruit flowers sprayed with hormones to make fruit develop but not seeds. fruit ripening farmers use hormones to control fruit ripening. |