Ch. 39.4—Plant Responses to Internal & External Signals

Question 1

Environmental Stress & Major Response:

_______ (stressor):

ABA production, reducing water loss by

closing stomata.

Answer 1

-Drought

Question 2

Environmental Stress & Major Response:

_________ (stressor):

Formation of air tubes that help roots survive

oxygen deprivation

Answer 2

-Flooding.

Question 3

Environmental Stress & Major Response:

________ (stressor):

Avoiding osmotic water loss by producing

solutes tolerated at high concentrations.

Answer 3

-Salt

Question 4

Environmental Stress & Major Response:

________ (stressor):

Synthesis of heat-shock proteins, which reduce

protein denaturation at high temperatures.

Answer 4

-Heat.

Question 5

Environmental Stress & Major Response:

________ (stressor):

Adjusting membrane fluidity; avoiding

osmotic water loss; producing antifreeze

proteins.

Answer 5

-Cold