Plant Defences Flashcards

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What do plant defences protect against?

Pathogens (microbes) and herbivores (animals that eat plants).

State two physical defences that stop pathogens entering a plant.

A waxy cuticle and tough cellulose cell walls.

How does the waxy cuticle help defend a leaf?

It forms a waterproof barrier that stops pathogens getting in.

How does bark protect a tree from disease?

It is a dead outer layer that blocks entry and can fall off with pathogens.

Which type of defence is the cellulose cell wall: physical, chemical, or mechanical?

Physical defence.

What do plant antibacterial chemicals do?

They kill bacteria or stop them growing.

How do plant poisons help the plant?

They taste bad or harm herbivores, so animals stop eating the plant.

How do thorns defend a plant?

They can hurt animals, so they avoid eating the plant.

How do tiny hairs on leaves and stems help defence?

They can trap or irritate insects and stop them feeding.

What happens when some leaves droop or curl when touched?

It can knock insects off and scare herbivores, reducing damage.

What is mimicry in plant defence?

Copying something to trick animals, for example fake egg spots to stop insects laying eggs.