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plant responses and hormones summary

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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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  • January 13, 2024
  • 4
  • 2023/2024
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Available practice questions

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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

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.

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