B5. TRIPLE ONLY. Plant communicable diseases Flashcards

1
Q

How can plant communicable diseases be caused?

A

By pathogens - bacteria, viruses, fungi and protists.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How could you detect that a plant has a disease?

A
  • stunted growth
  • spots on leaves
  • areas of decay (rot)
  • growths
  • malformed stems or leaves
  • discolouration (of leaves)
  • the presence of pests.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How could someone ‘diagnose’ a plant disease?

A

Identification can be made by:
• Use a reputable gardening manual or website
• taking infected plants to a laboratory to identify the pathogen
• using testing kits that contain monoclonal antibodies.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Explain how a MAGNESIUM ion deficiency could affect a plant.

A
  • Lack of magnesium: magnesium is needed to make chlorophyll. Lack of magnesium causes chlorosis.
  • If there isn’t enough chlorophyll plants cannot trap sunlight energy therefore lack of magnesium affects the rate of photosynthesis.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Explain how a NITROGEN ion deficiency could affect a plant.

A
  • Lack of nitrogen: nitrogen (in the form of nitrates) are required by plants to make proteins.
  • Lack of nitrogen causes poor plant growth.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are a plants PHYSICAL defence responses to resist invasion of microorganisms?

A
  • Cellulose cell walls.
  • Tough waxy cuticle on leaves.
  • Layers of dead cells around stems (bark on trees) which fall off.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are a plants CHEMICAL defence responses to resist invasion of microorganisms?

A
  • Antibacterial chemicals.

* Poisons to deter herbivores.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are a plants MECHANICAL adaptations to resist invasion of microorganisms?

A
  • Thorns and hairs deter animals.
  • Leaves which droop or curl when touched.
  • Mimicry to trick animals.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly