Science.7
Plant Responses Questions
Essential Questions
1. How do plants respond to external and
internal stimuli?
2. What are the types of responses that
occur in plants to external and internal
stimuli?
Vocabulary
force, motion, tropism,
geotropism, gravitropism,
stimuli, response,
phototropism, external stimuli,
internal stimuli
Name ______________________________
Date _______________________________
Objectives
1. Describe examples of plant responses to
external and internal stimuli.
2. Identify the types of responses that occur in
plants to external and internal stimuli.
Read pages 337-338 on Plant Responses and answer the following questions.
1. What is a stimulus?
_____________________________________________________________________
2. Give an example of an internal stimulus and its response.
_____________________________________________________________________
3. Give an example of an external stimulus and its response.
_____________________________________________________________________
4. Give an example of an internal stimulus and its response in a plant.
_____________________________________________________________________
5. What are some external stimuli that plants respond to?
_____________________________________________________________________
6. What are tropisms?
_____________________________________________________________________
7. What is a positive tropism?
_____________________________________________________________________
8. What is a negative tropism?
_____________________________________________________________________
Updated 11/22/10
Excerpt from Glencoe Science Grade 7 pgs. 337-338
1
12-23. What are some examples of tropisms in plants?
Plant
Description of
tropism
Stimuli—touch,
light, or gravity
Reason for the
reaction
When you touch a
Dormidera, its
leaves fold up.
Sunflowers all turn
their “faces”
towards the sun.
In Texas and in
China, the roots
of a Magnolia tree
grow downwards.
Tulips continue to
grow towards the
sun, even when
they have been
cut.
Morning Glories
close their flowers
at night and open
them in the
morning.
The Venus Fly
Trap catches and
digests insects who
trigger the little
hairs in its inner
surface.
Updated 11/22/10
Excerpt from Glencoe Science Grade 7 pgs. 337-338
2