Plant Hormones and Tropisms

Stems growing up against gravity is called?

• Negative Geotropism

• Positive Geotropism

• Negative Thigmotropism

• Positive Thigmotropism

What makes a tropism positive or negative?

• Positive = movement towards stimulus, Negative = movement away from stimulus

• Negative = movement towards stimulus, Positive = movement away from stimulus

• Who cares? It doesn't matter whether it is positive or negative

• Positive = when a plant is happy, Negative = when a plant is sad

Which type of plant tropism response is shown in the video? Hint: The roots are growing towards the water source.

• Phototropism

• Geotropism

• Thigmotropism

• Hydrotropism

Geotropism is

• The plant response to light

• The plant response to water

• The plant response to soil

• The plant response to gravity

The growth hormone that is used to speed up the ripening of fruits for export is

• giberellin.

• ethylene.

• cytokinin.

• auxin.

What is thigmotropism?

• The movement of plants in response to touch

• The movement of plants toward the sun

• A prokaryote's movement inside the bloodstream

• The movement of plants in response to gravity

Which type of plant tropism response is shown in the video?

• Phototropism

• Geotropism

• Thigmotropism

• Hydrotropism

promotes plant cell divison

• auxins
• cytokins
• ethylene

What is the reaction that is shown by the plant in the figure above?

• Positive hydrotropism.

• Negative phototropism.

• Positive thigmotropism.

• Negative geotropism.

Roots growing away from light is called?

• Positive Phototropism

• Negative Phototropism

• Positive Geotropism

• Negative Geotropism