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Plant Defense

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Plant defences: OCR Biology A level Module 4 Plant defences and diseases: #GCSE #Biology #OCR #Gateway #B6

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Questions 14

Answers

1
Two ways plants can protect themselves are:
growth and elongation
mechanical and physical barriers
mechanical and water barriers
mechanical and chemical barriers
2
Which plant extract is the most effective antibacterial?
A
F
B
E
3
Citronella geranium
increases the bee population
repels mosquitos
increases the number of mosquitos
is a viroid
4
Chitinases
destroys the pathogen's cell wall
act like resin
block the growth of pathogens
seals wounds in trees
5
Birds and insects can carry pathogens to plants and act as
vectors
pollinators
facilitators
progeny
6
Which of these is a chemical plant defence?
Cuticle
Cell wall
Caffiene
Cyanide
7
Why do we repeat experiments?
To increase accuracy
To increase precision
To check your answers
To identify anomalies
8
What is meant by aseptic techniques?
Practices that prevent contamination from microorganisms
Growing bacteria
Physical barriers against plant disease
Cleaning an area very well
9
What type of pathogen causes powdery mildew?
Virus
Fungus
Bacteria
Protozoa
10
Which of these is a physical barrier against pathogens?
Insect repellant
Cell wall
Antibacterial
Cell membrane
11
Special proteins protect the plant by:
apoptosis
engulfing bacteria
inactivating bacteria, fungi and insects
blocking the stomata
12
Plants use callose as a defence mechanism by
allowing pathogens to feed
stopping pathogens from spreading
inactivating photosynthesis
providing energy for insects
13
Cells would be under going this process to protect the plant from further infection.
Cellular respiration
Apoptosis
Necrosis
Transpiration
14
This is an example of a physical barrier plants use to protect against pathogens.
Caffeine
Sap
Waxy cuticle
Tannins