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AQA GCSE Biology > 4.3.3 plant disease (SINGLE) > Flashcards

4.3.3 plant disease (SINGLE) Flashcards

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1
Q
A
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2
Q

name a plant disease caused by a virus

A

tobacco mosaic virus

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3
Q

name a plant disease caused by a fungus

A

black spot

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4
Q

plant diseases can be detected by which symptoms?

A 
stunted growth
spots on leaves
areas of decay
discolouration
presence of pests
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5
Q

How can gardeners identify plant diseases

A
  1. consulting gardening manual or website
  2. take plant to a lab and identify pathogen
  3. use tests that contain monoclonal antibodies
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6
Q

plants can be infected with viruses, fungus, bacteria and what other organism?

A

insects - aphids

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7
Q

nitrate deficiency symptoms are

A

stunted growth

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8
Q

nitrates in a plant are needed to make

A

amino acids which make proteins

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9
Q

chlorosis is caused by which mineral deficiency?

A

magnesium

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10
Q

symptoms of a plant with chlorosis are

A

pale yellow leaves

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11
Q

why does a plant with chlorosis have yellow leaves

A

cant make chlorophyll

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12
Q

what is magnesium needed for in a plant?

A

to make chlorophyll

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13
Q

name the key mineral ions needed by a plant

A

magnesium and nitrates

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14
Q

Why is chlorophyll in a plant important?

A

needed for photosynthesis

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15
Q

what are aphids

A

insects

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16
Q

what are the 3 main defences plants have against disease/predation?

A

physical
chemical
mechanical

17
Q

give some examples of physical defences

A

waxy cuticle - barrier
cell wall
layers of dead cells around their stem

18
Q

What are physical defences

A

barriers to infection

19
Q

cell wall is made from

A

cellulose

20
Q

give some examples of chemical defences

A

antibacterial chemicals which can kill bacteria

posions

21
Q

chemical defences include poisons how does this help a plant?

A

deters a predator from eating it

22
Q

a herbivore is

A

an animal that eats plants

23
Q

give some examples of mechanical defences

A

thorns/spikes
droopy/curly leaves
mimicry

24
Q

what is mimicry?

A

when organisms mimic other organisms

25
Q

How does mimicry help a plant?

A

tricks animals into not eating it

AQA GCSE Biology (43 decks)

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