Plant Defence Mechanisms Quiz

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Which of the following is a physical or chemical signal that plants use to recognize pathogens?

Water

Carbon dioxide

Fragments from the cell walls of bacteria and fungi (correct)

Sunlight

What happens when a pathogen is recognized by proteins on the surface of plant cells?

The plant cell membrane becomes more permeable (correct)

The plant cell membrane disappears

The plant cell membrane stays the same

The plant cell membrane becomes less permeable

What is the purpose of cell wall apposition?

To repair wounds in the bark

To reinforce the cell wall with aggregates of material in the cytoplasm near a defect in the wall (correct)

To release hydrogen peroxide and kill microbes directly

To isolate the pathogen with a cluster of dead plant cells

What is the purpose of programmed cell death (apoptosis)?

To isolate the pathogen with a cluster of dead plant cells (B) Signup and view all the answers

What is the purpose of delayed active responses?

To limit the spread of the pathogen (C) Signup and view all the answers

What is one important strategy of delayed active responses?

Repair of wounds in the bark (A) Signup and view all the answers

What is systemic acquired resistance?

A signalling agent of subsequent infections (D) Signup and view all the answers

Question 1

What is the first line of defence for plants against pathogens? Signup and view all the answers

Answer 1

Passive barriers Signup and view all the answers

Question 2

What are the three major groups of responses involved in the second line of defence for plants against pathogens? Signup and view all the answers

Answer 2

Recognition of the pathogen, rapid response, and delayed response Signup and view all the answers

Question 3

How do plants recognize pathogens? Signup and view all the answers

Answer 3

By detecting certain physical and chemical signals, including fragments from the cell walls of bacteria and fungi Signup and view all the answers

Question 4

What changes in the permeability of plant cell membranes when a pathogen is recognized by proteins on the surface of cells? Signup and view all the answers

Answer 4

It allows the movement of certain ions, particularly calcium ions, into the cell and triggers defence responses by activating the expression of certain genes Signup and view all the answers

Question 5

What is the purpose of releasing hydrogen peroxide during a plant immune response? Signup and view all the answers

Answer 5

To kill microbes directly Signup and view all the answers

Question 6

What is the purpose of cell wall apposition? Signup and view all the answers

Answer 6

To reinforce the cell wall with aggregates of material in the cytoplasm near a defect in the wall Signup and view all the answers

Question 7

What is the purpose of systemic acquired resistance? Signup and view all the answers

Answer 7

To limit the severity of subsequent infections with a particular pathogen Signup and view all the answers

Question 8

What is the role of salicylic acid in delayed active responses? Signup and view all the answers

Answer 8

It may act as a signalling agent of subsequent infections and play a role in the plant’s ‘memory’ of a particular pathogen Signup and view all the answers