Homeostasis & ResponseHigh Exam FrequencyAQAEdexcelOCRWJEC
Plant Hormones
Topic 11: Plant Hormones
Study this topic
1Deep Dive2Deep Dive3Key Facts4How It Works5Practical6Definitions7Misconceptions8Memory Aid9Higher Tier10Exam Focus11Summary12Exam Tips
Tropisms — Plant Responses to Stimuli
Auxin — How It Works
Commercial Uses of Plant Hormones
How It Works: Auxin and Phototropism
Required Practical 8: Investigating Plant Responses
Key Definitions
Common Misconceptions
Memory Aids
Higher Gibberellins in Agriculture and Ethylene in Fruit Ripening
Exam Focus
Knowledge Organiser
Exam Tips: Plant Hormones
Sample Flashcards
What is phototropism?
Phototropism is the growth response of a plant to light. Shoots show positive phototropism — they grow towards the light source.
What is gravitropism?
Gravitropism is the growth response of a plant to gravity. Roots show positive gravitropism (grow downward, towards gravity). Shoots show negative gravitropism (grow upward, away from gravity).
Sample Questions
When a plant shoot is lit from one side, where does auxin accumulate?
Explain how auxin causes gravitropism (geotropism) in plant roots.
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