Week 6: Plant Responses

What is the response of a plant to light called?

• Geotropism

• Phototropism

• Negative geotropism

• Elongation

What is the term for the plant hormone that promotes cell elongation?

• Auxin

• Tropism

• Geotropic

• Phototropic

What do geotropic responses in plants involve?

• Response to light

• Response to gravity

• Response to water

• Response to temperature

Which hormone is involved in the phototropic response of stems?

• Cytokinin

• Gibberellin

• Auxin

• Ethylene

What is an example of a fast response in plants?

• Opening flowers

• Growing taller

• Fast-closing leaves of a Venus flytrap

• Changing leaf color

Which type of tropism involves movement towards or away from light?

• Geotropism

• Hydrotropism

• Phototropism

• Thigmotropism

What is the primary stimulus for phototropism?

• Water

• Gravity

• Light

• Touch

Where are auxins made in plants?

• Roots

• Leaves

• Tip of growing stems

• Flowers

What effect do auxins have on plant cells?

• Shrinkage

• Elongation

• Division

• Death

What causes the cells on the shady side of the shoot to elongate?

• Lack of water

• Accumulation of auxin

• Excess sunlight

• High temperature