B5 - Plant defence responses Flashcards
what type of defence is cellulose cell walls and what is the effetc of it
it is a phsyical defence , and helps to resits the invasion of microrganisms.
what type of defence is antibacterial chemicals and what is the effect of it
it is a chemical defence , it is effective at preventing bacterial diseases in plnts .
what type of defence is hairs and what is the effect of it
hairs is a mechanical defence , it deters insects and larger animals from feeeding on or laying on the leaves or stem of a plant .
what type of defence is waxy cuticle and what is the effect of it
a waxy cuticle is a phyisical defence , it acts as a barrier to the entry of the pathogens as pathogens can only enter at the stomata .
what type of defence is bark and what is the effect of it
bark is a physical defence and a layer of dead cells on the outside of the stems from a protective layer that is ahrd for pathogens to penetrate .
what type of defence is poison and what is the effect of it
poison is a mechanical defence , it deters herbivores and eating them make them feel unwell .
what type of defence is leaf fall and what is the effect of it
leaf fall is ap hysical defence , any pathogens that infect the leaves like rose black spot , fall of the tree when leaves are lost .
what type of defence is thorns and what is the effect of it
thorns is a mechanical defence , make it unplesan or pafll for large herbivores to eat them .
what type of defence is drooping and curling and what is the effect of it
is a maechinical defence , leaves collapse suddenly , disloding insects or frightening large animals .
what type of defence is mimicry and what is the effect of it
mechanical , some plants droop to mimic unhealthy plants and this tricks them into not eating them .
gived three types of plant pests
aphids , nematode worms and catepillars
explain how we can detect a disease in plants , how whould we knwo >
- if a plat has stunted growth - compare it to what the plant should actually be gorwn to .
- if a plant has spots on leaves compare to plant
- can see pests (aphids catepillars)
- use monoclonal antibodies to test for disease .
mineral ion defficiency to disease - nitrate tions
plnts need a good supply of nitrate ions to convert sugars made in photosynthesis into protenis needed in protein synthesis , If there is a nitrate defiecency - there will be limited portein growth anf the gorwth of the plants will be stunted , nt produce crop properly .
mineral ion defficiency to disease -magnesium ions
plants need magnesium ions to make chlorophyll for photosynthesis . If the level of magneisum ions int he soil is low , plants cannot make enoguh chlrophyll . The leaves become yellow nown as chlorosis . and growth slows down beause the plant cannot photosynthesise fully .
how can be pests be destroyed
aphids can be destroyed by using chemical pesticied or in enclosed spaces such as greenhosues , using bioloigvl pest cpntrol . Or releasng insecs like ladybirds and their larvae can corntol pathogen population so does not have an impact on the success of the crop .
