16.3 Plant responses to herbivory Flashcards

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1
Q

what are the physical defences of plants

A
  • thorns
  • spiny/hairy leaves
  • spikes
  • inedible tissue
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2
Q

what are the chemical defences of plants

A
  • tannins
  • alkaloids
  • terpenoids
  • pheromones
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3
Q

how to tannins defend plant

A

its bitter and toxic to insects it binds to digestive enzymes and inactivates them

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4
Q

how do alkaloids defend plants

A

it acts as a drug affecting metabolism and poisoning organism

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5
Q

how do terpenoids defend plants

A

insect repellants/toxins

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6
Q

how do pheromones defend plants

A

pheromones can be released when a plant is being attacked by insects, the release of pheromones causes neighbouring leaves to produce callose this increases defence against insects

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7
Q

what are VOC’s

A

volatile organic compounds
similar to pheromones but they facilitate communication between organisms (rather than within different parts of an organism
apple trees produce them to attract predatory mites when attacked by spider mites
wheat seedling use them to repel aphids

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