Tropic responses：练习题

What is the name of the growth response where a plant root grows towards the pull of gravity?

Which statement correctly describes how auxin causes a plant shoot to bend towards a light source?

What is the term for a growth response in which a plant part grows towards or away from the direction of a light source?

How does auxin control the growth of a plant shoot in response to light coming from one side?

What is the term for a plant growth response in which the shoot grows towards a light source?

Define phototropism and state whether a plant shoot typically shows a positive or negative response to a one-sided light source.

Explain how the unequal distribution of auxin in a horizontally placed plant shoot leads to a negative gravitropic response.

(a) Define the term gravitropism and state whether plant roots typically show positive or negative gravitropism.

(b) Explain the role of auxin in the phototropic response of a plant shoot when exposed to light from one side. In your answer, include where auxin is produced and how its distribution affects cell growth.

(a) Describe the response of a plant shoot to gravity, using the term gravitropism.
(b) Explain the role of auxin in controlling shoot growth when a plant is exposed to light from one side. Include details on where auxin is made and how its distribution leads to the shoot bending towards the light.