Summary
plant responses and hormones summary
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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Uploaded on
January 13, 2024
Number of pages
4
Written in
2023/2024
Type
Summary
plant hormones
commercial use
auxin
phototropism
geotropism
plant defences
ocr a
summary
Study Level
A/AS Level
Examinator
OCR
Subject
Biology
Unit
A2 Unit F214 - Communication, Homeostasis and Energy
All documents for this subject (31)
plant responses
Flashcards
50 Flashcards
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Flashcards
50 Flashcards
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Some examples from this set of practice questions
1.
list the various physical defences of a plant
Answer: spikes,
thorns,
spines, hairy leaves, inedible tissue.
stings
2.
list the chemical defences of a plant
Answer: tannins, alkaloids, terpenoids such as citronella
3.
how does mimosa pudica defend itself ?
Answer: folds in response to touch, scaring the animal
4.
how do plants communicate with one another ?
Answer: via releasing pheromones
5.
when do plants release pheromones ?
Answer: to warn other plants that they are being attacked by a herbivor
6.
how do neighbouring plants respond when they detect the pheromones of another plant ?
Answer: produce callose to protect from the attack
7.
what do synergistic plant hormones do ?
Answer: amplify each other\'s effects
8.
what do antagonistic plant hormones do ?
Answer: wor against each other, sometimes cancelling each other out
9.
what is the definition of a tropism ?
Answer: directional growth in response to a stimulus
10.
list the different types of tropisms
Answer: phototropism, gravitotropism, hydortropism, chemotropism, thigmotropism
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4. Summary - Neuronal communication summary
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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.