Plant Disease And Defences

Question 1

What do plants use magnesium ions for?

Answer 1

Making chlorophyll

Question 2

Give the chemical defences that a plant may have to defend itself?

Answer 2

• produce antibacterial chemicals which kill bacteria

- produce poisons which can deter herbivores

Question 3

Give the physical defences of a plant

Answer 3

• Waxy cuticle which provides a barrier to stop pathogens entering
• cell walls act as barrier to pathogens make it again past the waxy cuticle
• layers of dead cells around the stems e.g. bark

Question 4

What are nitrates needed for?

Answer 4

To make proteins therefore for growth

Question 5

Give the signs of an infected plant

Answer 5

• Stunted growth
• spots on the leaves
• patches of decay
• abnormal growth
• mail formed stems or leaves
• discolouration

Question 6

Give the mechanical defences of a plant

Answer 6

• Thrones and hairs which stop animals from touching and eating them leaves
• leaves that droop and curl when something touches them this means insects are knocked off
• mimic other organisms

Question 7

Give a symptom of nitrate deficiency in plants?

Answer 7

Stunted growth

Question 8

How does that prevent a tree from being infected with a pathogen?

Answer 8

It acts as a physical defence

preventing pathogens from entering the plant

Question 9

What term is used to describe yellow leaves on a plant?

Answer 9

Chlorosis

Question 10

Explain why plants with magnesium deficiency Are less able to photosynthesise

Answer 10

Magnesium is needed for making chlorophyll which is needed for photosynthesis