Plant Responses to the Environment Quiz

What is a tropism?

• A random growth pattern

• A non-directional growth response

• A growth response to internal signals

• A directional growth response to a stimulus

Which of the following is positively phototropic?

• Leaves of a plant

• Roots in soil

• Shoots of a plant

• Roots of a seedling

What causes the coiling seen in vines and tendrils?

• Thigmotropism

• Chemotropism

• Phototropism

• Hydrotropism

Which plant hormone plays an important role in phototropism?

• Ethene

• Abscisic acid

• Auxins

• Cytokinins

What is the function of abscisic acid (ABA)?

• Increases internode length

• Promotes seed dormancy

• Induces flowering

• Promotes cell division

Which hormone is responsible for ripening fruit?

• Auxins

• Cytokinins

• Ethene

• Gibberellins

What is the adaptive value of thigmotropism?

• Allows plants to grow towards water

• Enables plants to save energy by using other plants for support

• Facilitates seed dormancy

• Helps plants avoid harmful chemicals

Which of the following is a non-directional response?

• Chemotropism

• Nastic response

• Geotropism

• Phototropism

What is the mechanism behind phototropism?

• Cells shrink on the side facing the light

• Auxin accumulates on the side facing the light

• Cells elongate on the side facing the light

• Auxin accumulates on the shaded side causing cell elongation

Which of the following is an example of a nastic response?

• Roots growing downwards

• Roots growing towards water

• Leaves drooping when touched

• Shoots growing towards light