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Plant Tropisms
Test Description: Grades 6-8 Life Science
Instructions: Answer all questions to get your test result.
1) A ___ is anything in an organism’s environment that it might react to (~the “cause”).
A
receptor
B
response
C
hormone
D
stimulus
2) An ___ stimulus is the type of stimulus that comes from inside the organism.
A
internal
B
external
C
positive
D
negative
3) An ___ stimulus is the type of stimulus that comes from the organism's surroundings / environment.
A
internal
B
positive
C
external
D
negative
4) A ___ is an organism's reaction to a stimulus (~the “effect”).
A
response
B
positive
C
stimulus
D
negative
5) A ___ response is the type of response where the organism moves or grows TOWARDS the stimulus.
A
negative
B
positive
C
external
D
internal
6) A ___ response is the type of response where the organism moves or grows AWAY FROM the stimulus.
A
internal
B
positive
C
external
D
negative
7) ___ are specialized plant cells that gather information about their surroundings (similar to your eyes ears).
A
response
B
hormomes
C
receptors
D
stimuli
8) ___ are special chemicals made by plants that are used to send messages and control the growth of stems and roots.
A
responses
B
hormones
C
stimuli
D
receptors
9) ___ is the special name for PLANT responses to their environment.
A
dormancy
B
sensitivity
C
photoperiodism
D
tropism
10) ___ is plant movement or growth towards (or away from) LIGHT.
A
geotropism
B
hydrotropism
C
thigmotropism
D
phototropism
11) ___ is plant movement or growth towards (or away from) GRAVITY.
A
thigmotropism
B
phototropism
C
geotropism
D
hydrotropism
12) ___ is plant movement or growth towards (or away from) WATER.
A
phototropism
B
hydrotropism
C
geotropism
D
thigmotropism
13) ___ is plant movement or growth towards (or away from) TOUCHING something.
A
thigmotropism
B
hydrotropism
C
geotropism
D
phototropism
14) Plant ___ often have a positive response to LIGHT - meaning they grow towards light.
A
stems and leaves
B
roots
C
all of these
D
flowers
15) Plant ___ often have a positive response to GRAVITY - meaning they grow downwards towards gravity.
A
stems and leaves
B
flowers
C
none of these
D
roots
16) Plant ___ often have a negative response to GRAVITY - meaning they grow up away from gravity.
A
flowers
B
stems and leaves
C
all of these
D
roots
17) Plants stems leaves grow towards light because ___.
A
stems and leaves do NOT grow towards light
B
sunlight is needed for photosynthesis
C
they are afraid of the dark
D
it slows transpiration and saves water
18) Plant ___ often have a positive response to WATER - meaning they grow towards water.
A
all of these
B
roots
C
stems and leaves
D
flowers
19) ___ is when plants temporarily stop growing - often to prepare for very cold or very dry seasons.
A
photoperiodism
B
tropism
C
dormancy
D
sensitivity
20) when a plant continually turns to face towards (or away from) the Sun over the day
A
thigmotropism
B
heliotropism
C
phototropism
D
geotropism
*select an answer for all questions
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