Regulation of Plant Growth

Question 1

What is tropism?

Answer 1

A change in the direction of growth or movement of a plant in response to a stimulus

Question 2

What are the 2 types of plant reponses?

Answer 2

Tropisms and Nastic movement

Question 3

What is phototropism?

Answer 3

Growing toward light by the stems and leaves of a plant Positive = towards sun, Negative = away from sun

Question 4

What is geotropism?

Answer 4

Growing towards gravity, root will always grow downward Positive = grows towards gravity Negative = grows away from gravity

Question 5

What are some other examples of tropisms and what are they?

Answer 5

Thigmotropism: slow response to touch and pressure Chemotropism: response to chemicals Hydrotropism: response to water

Question 6

What is nastic movement?

Answer 6

Quick turgor responses that do not depend on stimulus e.g Venus flytrap

Question 7

What are the 2 types of plant hormones?

Answer 7

Growth promoters and growth inhibitors

Question 8

What are the 3 growth promoting hormones?

Answer 8

Auxins, Gibberellins, cytokinins

Question 9

What are the 2 growth inhibiting hormones?

Answer 9

Abscisic Acid and Ethylene