Plant Responses

Question 1

What is Synergism?

Answer 1

When 2 or more plant growth regulators act together to reinforce the effect

Question 2

What is Antagonism?

Answer 2

When 2 or more plant growth regulators have opposing actions

Question 3

What are the 3 ways hormones move around in plants?

Answer 3

Active transport
Diffusion
Mass flow in phloem sap or xylem vessels

Question 4

What are the 5 growth hormones in plants?

Answer 4

Cytokinins, Abscisic acid (ABA), Auxins, Gibberellins and Ethene

Question 5

What is the effect of Cytokinins?

Answer 5

Promote cell division, delay leaf senescence, overcome apical dominance, promote cell expansion

Question 6

What is the effect of ABA

Answer 6

Inhibits seed germination and growth, stomal closure when the plant is water stressed

Question 7

What is the effect of Auxins?

Answer 7

Promote cell elongation, inhibit growth of side shoots, inhibit lead abscission

Question 8

What is the effect of Gibberellins?

Answer 8

Promote seed germination, growth of stems

Question 9

Ethene

Answer 9

Promotes fruit ripening

Question 10

What is tropism?

Answer 10

When a plant grows towards or away from an external stimulus

Question 11

What is the opposite of tropism?

Answer 11

Nastic response

Question 12

What is Thigmotropism?

Answer 12

The shoots of a climbing plant such as ivy wind around other plants or structures and gain support