week 3

Question 1

What is measles?

Answer 1

• Viral
• Spread by droplets from an infected person’s sneeze or cough
• Symptoms: red skin rash, fever
• can be fatal, can lead to lung infection or brain infection.
• Can be vaccinated against it

Question 2

What is HIV?

Answer 2

• Human immunodeficiency virus
• Caused by the exchange of bodily fluids (sharing needles)
• Symptoms: flu-like symptoms for a few weeks, usually there are no more symptoms for several years. During this time, HIV can be controlled using antiretroviral drugs. (Stops the virus from replicating inside the body).
• The virus attacks the immune cells
• If the immune system is badly damaged, it can’t cpe with other infections. At a late stage HIV is known as AIDS.

Question 3

What is tobacco mosaic virus?

Answer 3

• Affects plants
• Causes a mosaic pattern on the leaves of the plant, leaves may become discoloured
• Discolouration means that the plant can’t carry out photosynthesis. (Affects growth)

Question 4

What is Rose black spots?

Answer 4

• Fungal
• Cause purple or black spots on the leaves
• Leaves turn yellow and drop off
• Photosynthesis can’t happen very well
• Spreads by water or air
• Fungicide can be used or stripping the plant from the affected leaves

Question 5

What is malaria?

Answer 5

• Protist
• Part of the protist’s life cycle happens inside the mosquito
• The mosquito is a vector
• Every time the mosquito feeds on another animal it infects it by inserting the protist into the animal’s blood vessels
• Causes fever, can be fatal
• Prevention: Stopping the mosquitoes from breeding, use insecticide and mosquito nets.