The role of all plant hormones is to

• suppress plant growth

• regulate plant functions

• delay fruit ripening

• shorten plant cells

Which type of plant hormone causes fruit to ripen?

• gibberelins

• ethylene

• cytokinins

• auxins

The movement of a plant in response to an environmental stimulus is called a

• hormone

• receptor

• tropism

• cytokinin

Thigmotropism is a plant’s response to

• light

• hormone

• touch

• gravity

A plant’s response to changes in the length of day and night is called

• thigmotropism

• phototropism

• gravitropism

• photoperiodism

Which type of plant hormone produces dramatic increases in the size of a plant?

• gibberelins

• ethylene

• auxins

• cytokinins

What effect do cytokines have on a plant

• causes plant to grow toward light

• causes plant to grow towards water

• stimulates cytokinesis and is involved in production of side branches

• stimulates apoptosis when a plant is no longer capable of bearing fruit

A root growing downward and a shoot growing upward are both examples of

• phototropism

• thigmotropism.

• photoperiodism

• gravitropism

In which part of the plant does auxin accumulate in?

• part of the stem that receives the most sunlight

• part of the stem that is shaded

• in the roots so they grow down

• in the leaves to aid in capturing sunlight

Auxin is involved in which type of tropism?

• gravitropism

• thigmotropism

• phototropism

• hydrotropism