22.5 Plant Hormones and Responses

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?

• gibberellins

• 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.

Phototropism is a plant’s response to

• light.

• hormone.

• touch.

• gravity

A plant’s response to gravity is called

• thigmotropism.

• phototropism.

• gravitropism.

• photoperiodism.

A chemical messenger produced in an organism that simulates or suppresses the activity of cells.

• tropism

• hormone

• light

• gravity

Tags

NGSS.MS-LS1-2

Which type of plant hormone causes dramatic increases in size, involved in seed dormancy, starting germination and promoting rapid growth of young seedlings?

• gibberellins

• ethylene

• cytokinins

• auxins

Which type of plant hormone stimulates cytokinesis (the final stage of cell division), involved in the growth of side branches, and slow the aging process in some plant organs?

• gibberellins

• ethylene

• cytokinins

• auxins