Cambridge IGCSE · Biology (0610)

Tropic responses: Practice Questions

5 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Tropic responses.

9 questions22 marksFree, no account

Question 1

1 mark

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

Question 2

1 mark

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

Question 3

1 mark

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

Question 4

1 mark

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

Question 5

1 mark

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

Question 6

3 marks

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

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Question 7

4 marks

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

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Question 8

5 marks

(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.

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Question 9

5 marks

(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.

Write your answer out first, then check it against the worked solution.

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