Defences of plants and nutrients

Question 1

What ions are needed by plants ad what do they do

Answer 1

Nitrates-Make proteins and help growth
Magnesium-Making chlorophyll which allows which is needed for photosynthesis they have yellow leaves when they dont have enough magnesium

Question 2

What are 3 signs that plants have got a disease

Answer 2

Stunted growth
Discouloured leaves
Rotting

Question 3

Plants

What are the physical defences

Answer 3

Plant leaves and stems have a waxy layer/cuticle which is a barrier
Cell walls are a barrier behind the waxy cuticle
Plants have layers of dead cells around their stems for protection

Question 4

Plants

What are the chemical defences

Answer 4

Some can produce poisons which deter herbivores like deadly nightshade

Question 5

Plants

What are some mechanical defences

Answer 5

Some plants have thorns/hairs
Some plants droop or curl to knock off insects
Some plants mimic other animals to scare herbivores away