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- 1. Multiple Choice
Response to a stimulus in plants is called ________.
touch
gravity
light
tropism
- 2. Multiple Choice
A __________ is something that evokes a response.
stimulus
response
tropism
- 3. Multiple Choice
The growth of shoots and roots is controlled by a group of hormones called _________.
auxins
ethylene
stimulus
tropism
- 4. Multiple Choice
Roots growing down into the earth is an example of ___________.
phototropism
geotropism
thigmotropism
- 5. Multiple Choice
A growth movement away from a stimulus is called _________.
positive tropism
positive phototropism
negative tropism
- 6. Multiple Choice
Growth movement of a plant towards touch is called __________.
thigmotropism
geotropism
phototropism
- 7. Multiple Choice
Which of the following is not a stimulus that plants respond to?
touch
light
wind
earth/gravity
- 8. Multiple Choice
Hormones are ________________.
tissues
chemical messengers
cells that carry oxygen
molecules in the air
- 9. Multiple Choice
Which hormone allows plants to perform phototropism?
cytokinins
ethylene
gibberellins
auxins
- 10. Multiple Choice
Where are auxins made?
roots
stem tips
leaves
flowers
- 11. Multiple Choice
Which plant hormone helps elongate the stem between nodes?
cytokinins
ethylene
gibberellins
abscisic acid
- 12. Multiple Choice
What hormone is important in making roots and shoots?
cytokinins
auxins
abscisic acid
ethylene
- 13. Multiple Choice
Where are cytokinins produced?
leaves
stems
root tips
flowers
- 14. Multiple Choice
What hormone is known as the ripening hormone?
auxin
ethylene
cytokinins
gibberellins
- 15. Multiple Choice
What is abscisic acid?
a hormone that signals dehydration
a hormone that makes leaves close their stomata to prevent water loss
a hormone made in chloroplasts
all of the above
- 16. Multiple Choice
Which of the following is an example of thigmotropism?
vines wrapping around a tree
trees growing near a lake
roots growing into the earth
sunflowers following the sun
- 17. Multiple Choice
What is represented in the diagram?
thigmotropism caused by auxins
phototropism caused by auxins
geotropism caused by gibberellins
phototropism caused by ethylene
- 18. Multiple Choice
What is this an example of?
phototropism
geotropism
thigmotropism
hydrotropism
- 19. Multiple Choice
What hormone causes this to happen?
ethylene
cytokinins
auxins
abscisic acid
- 20. Multiple Choice
If you break the tip of the stem off of a plant, what will not happen?
thigmotropism
phototropism
geotropism
plant growth
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