Tropic & Nastic Responses

Which response is due to permanent elongation of plant cells?

• Nastic movements

• Tropic growth

• Both

• None

What type of plant response are these roots showing?

• Negative geotropism

• Positive geotropism

• Negative phototropism

• Positive phototropism

These "Ngirum-kirum" (Mimosa pudica) leaves are displaying what?

• Chemotaxis

• Thigmotropism

• Thigmonastic movement

• Hydrotropism

Your climbing beans and peas attach to supports by using positive thigmotropism in their

• stem only

• roots only

• stems and tendrils

• roots and stems

Where are auxins made in the plant?

• In the growing tip of a stem or root

• In the older part of a stem or root

• All plant cells can make auxins

When on a windowsill, which side of a plant stem contains more auxin?

• The shaded side

• The side in the light

• Both sides (shaded and non-shaded) contain the same amount of auxin

What causes a root to bend in the direction of the force of gravity?

• Cells on the upper side of the root expand more than those on the lower side

• Cells on the lower side of the root expand more than those on the upper side

Which statement about plant roots is correct?

• They are negatively phototropic and negatively geotropic

• They are positively geotropic and positively hydrotropic

• They are positively geotropic but negatively hydrotropic

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

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

• Positive hydrotropism.

• Negative phototropism.

• Positive thigmotropism.

• Negative geotropism.