Plant Responses Quiz

What is a stimulus in plants?

• A chemical that controls plant growth

• Something that causes a reaction in an organism

• A change in growth in response to light

• The activity of an organism as a result of a stimulus

Which tropism is a change in growth in response to gravity?

• Thigmotropism

• Geotropism

• Hydrotropism

• Phototropism

What is the function of growth regulators in plants?

• Control the growth of a plant

• Protect against excessive water loss

• Allow for maximum photosynthesis

• Prevent enzymes from denaturing

Which growth regulator is a root promoter in small amounts but a shoot inhibitor?

• IAA

• Auxin

• Gibberellin

• Ethene

What is the purpose of heat shock proteins in plants?

• Allow for maximum photosynthesis

• Prevent enzymes from denaturing in high temperatures

• Attack micro-organisms cell walls

• Encourage herbivores to eat the plant

Which plant adaptation discourages herbivores from eating the plant?

• Foul tasting chemicals

• Stinging dermal hairs

• Thorns

• Cuticle and stomata closure

What is the response of a plant as a result of a stimulus?

• A change in growth in response to light

• Something that causes a reaction in an organism

• The activity of an organism as a result of a stimulus

• A chemical that controls plant growth

Which tropism is a change in growth in response to touch?

• Hydrotropism

• Thigmotropism

• Geotropism

• Phototropism

Which growth regulator is a root inhibitor and a shoot promoter in large amounts?

• Gibberellin

• IAA

• Ethene

• Auxin

Which plant adaptation protects against excessive water loss?

• Cuticle and stomata closure

• Stinging dermal hairs

• Foul tasting chemicals

• Thorns