abscisic acid
plant hormone that regulates survival functions of a plant, such as the opening and closing of stomata
auxin
growth chemicals (hormones) produced in plants that are characterized by their ability to induce cell elongation and cell division in stems
cytokinins
growth chemicals (hormones) that help plant cells divide
ethylene
gaseous plant hormone that promotes ripening of fruit or blooming of flowers
geotropism
the movement or growth of a plant in response to gravity
gibberellin
growth chemicals (hormones) made by plants that stimulate stem elongation, seed germination, and flowering
homeostasis
the relatively constant state in the internal environment of an organism
hydrotropism
the growth of plants toward water
phototropism
the growth of a plant in response to sunlight
thigmotropism
the movement or growth of a plant in response to touch
tropism
plant growth caused by external stimulus
............. is the process by which internal environments of an organism are regulated.
Homeostasis
Plant growth caused by external stimulus is _____.
a tropism
How do plants maintain homeostasis? Select all that apply.
By exchanging gas through stomata.
By closing stomata to prevent water loss.
By altering the activity within a cell with chemical transmitters.
By growing towards sunlight.
The chemical that promotes phototropism is _____.
Auxin
If you want your crops to grow larger than they normally would, you may want to try adding _____.
gibberellin
_____ helps plant cells divide and is located primarily in roots and fruits.
Cytokinin
This is a plant hormone that is given off to ripen fruit or flowers.
Ethylene
Leaves curving towards sunlight are examples of _____.
phototrophism
Roots growing down into the ground are examples of _____.
geotrophism
Plants growing towards air that has higher humidity levels are examples of _____.
hydortophism