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plant responses and hormones summary

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2023/2024 Written for academic year
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A2 Unit F214 - Communication, Homeostasis and Energy
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coincise notes on plant responses and hormones, in bullet points to summarise processes of seed germination, antifreezing, leaf abscission, stomatal closure, geotropism and phototropism, apical dominance, plant defences

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Plant responses
Tropisms
● Directional growth to a stimulus .
○ Phototropism
○ Geotropism
○ Hydrotropism
○ Chemotropism
○ Thigmotropism

PHOTOTROPISM

● Positive: shoot towards light source

● Negative: root towards soil with minerals and water

AUXIN

On shaded side

Stimulates growth in shoots and cell elongation = shoot bends towards light source

Stimulate active transport of H+ via ATPase into cell walls

Lowering pH : optimum for expansins which hydrolyse bonds in cellulose and weakens
them.

Document information

Study Level
A/AS Level
Subject
Biology
Uploaded on
January 13, 2024
Number of pages
4
Written in
2023/2024
Type
Summary
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a level biology module 5 summary (except animal responses)
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Subjects

  • plant hormones
  • commercial use
  • auxin
  • phototropism
  • geotropism
  • plant defences
  • ocr a
  • summary

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