What is a “Tropism”?

A tropism is when an organism grows/bends toward or away from an external stimulus, such as light, heat, or gravity

  • Positive tropism- movement toward the stimulus
  • Negative tropism- movement away from the stimulus

Click here to watch the video

Answer these Questions (in your spiral)

  • 1.  What forces are acting on plant seeds when it sprouts?
  • 2.  If you plant a seed “upside down” will it still grow properly? How do you know?

Geotropism

Gravity causes a response to the plants growth.

Hydrotropism

The way a plant grows or bends in response to water.

Thigmotropsm

Phototropism

The way a plant grows or bends in response to light.

click here to watch phototropism VIDEO!

Answer these questions (in your spiral)

1.  What forces are acting on plant seeds when it sprouts?

2.  If you plant a seed “upside down” will it still grow properly? How do you know?

3.  Write to describe how tropisms help a plant to survive

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