Mod 7

Question 1

Types of transmission of an infectious disease

Answer 1

Direct - person to person
eg. HIV

Indirect - through air, ground
eg. Measles

Insect Vector - transmission from one person to another via organism
eg. Malaria

Question 2

Koch’s postulates

Answer 2

Method of linking a set disease to a disease causing pathogen

1. Organism present in diseased individual
2. The microbes must be able to be isolated and grown in a pure culture
3. Pure culture must induce disease when given to another individual
4. The same microbes must be able to be isolated again and identified as the original species

Question 3

Pasteur’s experiment

Answer 3

Pasteurisation

In the 1860’s Louis Pasture conducted his experiement on the swan neck flask, disproving spontaneous generation- developing germ theory

Method

1. Fill two swan neck glasses with nutrient
2. Heat and bend one of the flask necks into a swan shape
3. Boil broths to kill any microbes
4. Leave for several days
5. Examine the growth of bacteria in each flask

Question 4

Plant disease

Answer 4

Lemon Scented gum (Corymbia Citriodora)

Fungal Stem Canker
- gains access to inner layers of stem through damaged outer layers of bark

The tree’s defence - produces excess resinous sap at the wound site to expel the pathogen

Question 5

Agriculture plant disease

Answer 5

Alternaria Stem Canker

Fungal pathogen that effects tomato plants.

Airborne or by infected soil.

Results in dying tissue and death of plant.

Question 6

Animal disease

Answer 6

Classical Swine fever

Viral infection effecting pigs

Symptoms: high fever, huddling, cobsitipation and diarrhoea

Impacts: animal death, human illness, low grow rate, loss of fertility