Cambridge IGCSE Biology practice

Paper 3 structured question: Tropic responses

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Tropic responses

Exam-style question

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Paper 3Theory (Core)3 marks

A plant is placed horizontally. After some time, the shoot bends upwards and the root bends downwards.

Description

When a plant is placed horizontally, the shoot bends upwards and the root bends downwards over time.

a
Identify the type of plant response shown by the shoot and root.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Describe how gravitropism causes the shoot to bend upwards.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 3Theory (Core)2 marks

Description

The seedling is placed in a pot tilted at an angle. Despite the tilt, roots grow downwards into the soil, and shoots grow upwards towards the light.

a
Describe how gravitropism causes the roots to grow downwards in the tilted pot.
Your answer
Aim for approximately 2 distinct marking points.
[2]