Plant Tropisms Question Preview (ID: 59381)


Grades 6-8 Life Science.

Plant ___ often have a negative response to GRAVITY - meaning they grow up away from gravity.
a) stems and leaves
b) roots
c) flowers
d) all of these

Plant ___ often have a positive response to GRAVITY - meaning they grow downwards towards gravity.
a) roots
b) stems and leaves
c) flowers
d) none of these

Plant ___ often have a positive response to LIGHT - meaning they grow towards light.
a) stems and leaves
b) roots
c) flowers
d) all of these

___ is plant movement or growth towards (or away from) TOUCHING something.
a) thigmotropism
b) phototropism
c) geotropism
d) hydrotropism

___ is plant movement or growth towards (or away from) WATER.
a) hydrotropism
b) phototropism
c) geotropism
d) thigmotropism

___ is plant movement or growth towards (or away from) GRAVITY.
a) geotropism
b) phototropism
c) hydrotropism
d) thigmotropism

___ is plant movement or growth towards (or away from) LIGHT.
a) phototropism
b) geotropism
c) hydrotropism
d) thigmotropism

___ is the special name for PLANT responses to their environment.
a) tropism
b) photoperiodism
c) dormancy
d) sensitivity

___ are special chemicals made by plants that are used to send messages and control the growth of stems and roots.
a) hormones
b) receptors
c) stimuli
d) responses

___ are specialized plant cells that gather information about their surroundings (similar to your eyes ears).
a) receptors
b) hormomes
c) stimuli
d) response

A ___ response is the type of response where the organism moves or grows AWAY FROM the stimulus.
a) negative
b) positive
c) internal
d) external

A ___ response is the type of response where the organism moves or grows TOWARDS the stimulus.
a) positive
b) negative
c) internal
d) external

A ___ is an organism's reaction to a stimulus (~the “effect”).
a) response
b) stimulus
c) positive
d) negative

An ___ stimulus is the type of stimulus that comes from inside the organism.
a) internal
b) external
c) positive
d) negative

An ___ stimulus is the type of stimulus that comes from the organism's surroundings / environment.
a) external
b) internal
c) positive
d) negative

A ___ is anything in an organism’s environment that it might react to (~the “cause”).
a) stimulus
b) response
c) hormone
d) receptor

Plants stems leaves grow towards light because ___.
a) sunlight is needed for photosynthesis
b) they are afraid of the dark
c) stems and leaves do NOT grow towards light
d) it slows transpiration and saves water

Plant ___ often have a positive response to WATER - meaning they grow towards water.
a) roots
b) stems and leaves
c) flowers
d) all of these

___ is when plants temporarily stop growing - often to prepare for very cold or very dry seasons.
a) dormancy
b) photoperiodism
c) tropism
d) sensitivity

when a plant continually turns to face towards (or away from) the Sun over the day
a) heliotropism
b) geotropism
c) thigmotropism
d) phototropism

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