SB6f Plant Hormones

Question 1

Tropism?

Answer 1

responding to a stimulus by growing towards/away from it

Question 2

Are plant shoots positively or negatively phototropic?

Answer 2

they are positively phototropic, towards the light

Question 3

Are roots positively or negatively phototropic?

Answer 3

they are negatively phototropic, away from the light

Question 4

Describe the role of auxins in phototropism.

Answer 4

auxins are produced in the tips of a shoot, auxins diffuse to the shaded side and elongate the cells, which make the shoot grow towards the light

Question 5

Describe the role of auxins in gravitropism.

Answer 5

auxins are found in root-tips. Auxins stop the roots elongating, growth is in the direction of gravity therefore ensuring they reach moisture