Malaria is a potentially fatal infectious disease that is spread to humans by infected mosquitoes - HSC - SSCE Biology - Question 26 - 2023 - Paper 1
Question 26
Malaria is a potentially fatal infectious disease that is spread to humans by infected mosquitoes. Scientists investigated the behaviour of 20 mosquitoes for an hour... show full transcript
Worked Solution & Example Answer:Malaria is a potentially fatal infectious disease that is spread to humans by infected mosquitoes - HSC - SSCE Biology - Question 26 - 2023 - Paper 1
Step 1
Identify the dependent variable
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The dependent variable is the number of mosquitoes that land on the clothing.
Step 2
Identify a controlled variable
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A controlled variable could be the size of the container or the number of mosquitoes in each container.
Step 3
Justify a conclusion for the investigation
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Wearing clean clothing would reduce the transmission of malaria as mosquitoes land on clean clothing an average of fewer times than on soiled clothing. Infected mosquitoes can only pass on infection if they land on a host and bite them.
