Why do aphids 'attack' plants?

To feed on the glucose in the phloem

Which of these is NOT a way to identify plant diseases?

Taking an infected plant to the garden centre to be examined.

Aphids also act as vectors. What does this mean?

They transfer pathogens to the plants

What are the two ways aphids can be destroyed?

Biological pest control and chemical pesticides

What happens if a plant has a magnesium deficiency?

Leaves become yellow (chlorosis) and growth slows down

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B3 Plant disease and defences TRIPLE

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Plant disease and defences quiz GCSE Biology AQA

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Questions 14

Answers

1
Why do aphids 'attack' plants?
To feed on the glucose in the phloem
To feed on the cellulose in the cell wall
To feed on the water in the xylem
To kill the plant
2
Which of these is NOT a way to identify plant diseases?
Taking infected plants to a laboratory.
Taking an infected plant to the garden centre to be examined.
Looking in a gardening manual or website.
Using testing kits that contain monoclonal antibodies.
3
What type of barrier is : producing antibacterial chemicals
Chemical
Physical
Mechanical
4
Why do plants need magnesium ions?
To make cellulose
To make glucose
To make proteins
To make chlorophyll
5
What happens if a plant has a nitrate deficiency?
Stundted growth
Mosaic pattern of discolouration
Purple/black spots
Yellow leaves
6
Why do plants need nitrates?
To make cellulose
To make lipids
To make proteins for growth
To make glucose
7
What type of barrier is :Cellulose cell wall strengthen cells to resist invasion from pathogens
Physical
Mechanical
Chemical
8
What type of defence response is : poisons
Chemical
Physical
Mechanical
9
Aphids also act as vectors. What does this mean?
They heal the plant
They transfer food to the plant
They transfer pathogens to the plants
They kill the plant
10
What are the two ways aphids can be destroyed?
Biological pest control and chemical pesticides
Burning them and chemical pesticides
Burning them and chemical fungicides
Biological pest control and chemical fungicides
11
What happens if a plant has a magnesium deficiency?
Leaves become yellow (chlorosis) and growth slows down
Stunted growth
Mosaic pattern of discolouration
Purple/black spots
12
What type of defence response is : thorns
Physical
Mechanical
Chemcial
13
What type of barrier is :Bark on trees, layer of dead cells on the outside of stems
Physical
Mechanical
Chemical
14
What type of defence response is: drooping or curling of leaves when touched
Physical
Chemcial
Mechanical

B3 Plant disease and defences TRIPLE Flashcards | StudBud