Chapter 12.1 Plant Responses

What is any change in an organism’s environment that causes a response?

• hormones

• photoperiodism

• tropism

• stimuli

What is a response that results in plant growth toward or away from a stimulus?

• hormones

• photoperiodism

• tropism

• stimuli

What is the plant’s growth toward or away from light?

• hormones

• phototropism

• tropism

• stimuli

What type of tropism is involved when a plant responds to touch?

• phototropism

• gravitropism

• thigmotropism

• none of the above

What type of tropism is involved when stems grow away from gravity?

• phototropism

• negative gravitropism

• thigmotropism

• positive gravitropism

What is a plant’s response to the number of hours of darkness in its environment?

• photoperiodism

• gravitropism

• thigmotropism

• none of the above

Plants that flower when exposed to darkness less than 10 to 12 hours of darkness are called ______________.

• long-day plants

• short-day plants

• day-neutral plants

• none of the above

Plant cells respond to auxins with increased ____________.

• decay

• color

• growth

• none of the above

Tags

NGSS.MS-LS1-5

What plant hormone helps fruit ripen?

• ethylene

• gibberellins

• cytokinins

• none of the above

What hormones increase the rate of cell division and cell elongation?

• ethylene

• gibberellins

• cytokinins

• none of the above