Edexcel IGCSE Biology 2.85 Auxin & phototropism
Practise linking auxin movement to shoot bending, completing tropism passages and judging why auxin differs from animal hormones.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- describe auxin collecting on the shaded side and causing greater cell elongation
- complete passage gaps linking tropisms, phototropism, gravity and auxin
- suggest why auxin is not treated like an animal hormone using transport or source
2.85 Auxin and phototropism question 1
[Maximum number: 2]
Plants respond to stimuli.
Some of these responses are called tropic responses.
Describe the role of auxin in plant responses to light.
A description that includes two of the following
- auxin moves away from light / collects on shaded side / eq
- auxin stimulates growth / elongation /eq
- grows more on shaded side / side away from light / bends / grows towards light / positive (photo)tropic response / eq
assume shoot unless root stated
grows towards light scores mp2 and mp 3
for root mp 1 same mp 2 inhibits mp 3 grows less on shaded side/ bends away
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