3.1.4 & 5 Fungal & protist diseases

Cards (8)

  • Fungal disease: rose black spot AND protist disease: malaria
  • Disease: Rose black spot
    Caused by: A fungus
    Symptoms :
    Purple / black spots on leaves
    Leaves often turn yellow & drop early
    Affects growth of plant as photosynthesis is reduced
    How is it spread?
    In the environment by water or wind
    How can spread be reduced or prevented?
    Fungicides (kill fungi)
    Removing and destroying affected leaves
  • Disease:Malaria
    Caused by:A protist
    Symptoms:
    Recurrent episodes of fever and can be fatal
    How is it spread?
    Malarial protist has a life cycle that includes the mosquito, which is a vector
    Mosquito feeds on infected blood then bites a human
    How can spread be reduced or prevented?
    Prevent mosquitoes breeding eg. drain water holesfewer to pass on pathogen
    Mosquito nets (or insect repellent) → to avoid being bitten
  • why is this statement wrong?
    “Bug spray prevents spread of malaria.”
    This is not specific enough. Instead, use the term insect repellent.
  • why is this statement wrong?
    “Malaria is a pathogen.”
    A pathogen is a microorganism that causes disease. Malaria is the disease and the pathogen that causes it is a type of protist
  • why is this statement wrong?
    "Malaria is caused by mosquitoes.”
    Malaria is caused by a protist that is carried by mosquitoes, so mosquitoes act as vectors.
  • Suggest reasons for the reduced number of deaths from malaria each year. (2)
    Improved health care / new treatments
    Changing behaviour to avoid being bitten (or give example)
  • Explain why bushes infected with rose black spots show reduced growth. (3)
    ● Less chlorophyll so less photosynthesis
    ● So less glucose made
    ● So less proteins / lipids / cellulose made (for growth)