7th Grade

1
7th Grade Unit 1 Organism Response to the
Environment Lesson 2 Seedling
Science Vocabulary of Instruction
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Gravity

• The force that pulls objects toward each other.

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Stimuli

• Something causing or regarded as causing a
  response.

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Response

• A change in an organisms surroundings that cause
  the organism to react.

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Tropism

• Is a biological phenomenon, indicating growth or
  turning movement of a biological organism,
  usually a plant, in response to an environmental
  stimulus.

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Geotropism

• Is the term applied to the consequent orientation
  response of growing plant parts.

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Hydrotropism

• Is a directional growth response in which the
  direction is determined by a stimuli in water
  concentration.

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Phototropism

• Is directional growth in which the growth is
  determined by the direction of the light source.

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Thigmotropism

• Is a movement in which an organism moves or grows
  in response to touch or contact stimuli.