Topic 5 - Plant Barriers Aginst Disease Flashcards

1
Q

What are the two main types of barriers plants use against disease?

A

Physical barriers and chemical barriers

Physical barriers include structural defenses, while chemical barriers involve biochemical responses.

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2
Q

What is a physical barrier that plants have to prevent pathogen entry?

A

A thick cellulose cell wall

This cell wall is impermeable to many pathogens.

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3
Q

What role does the waxy cuticle on leaves play in plant defense?

A

Acts as a barrier to most pathogens

The cuticle is a protective layer on the surface of the leaf.

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4
Q

How do trees prevent pathogens from reaching their inner tissues?

A

A layer of bark

Bark serves as a protective outer covering for the tree.

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5
Q

What can leaves do to stop pathogens from entering the plant?

A

Close their stomata

Stomata are small pores that facilitate gas exchange.

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6
Q

What types of substances can some plant cells produce as a chemical barrier?

A

Antimicrobial chemicals, proteins, and enzymes

These substances help to inhibit the growth of pathogens.

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7
Q

What strategy do some plants use to deter pests through chemical means?

A

Release compounds that attract larger insects

These larger insects prey on the pests, providing a natural form of pest control.

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8
Q

What can be extracted from some plants for medicinal use?

A

Antimicrobial compounds

These compounds can be used in drugs such as antibiotics.

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