Notesale: Turn your study into money

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Statement
of Problem:

Mosquitoes are attracted to ones sweat and the carbon dioxide which is increased
with the respiration rate
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Aim:

To determine the number of mosquitoes attracted to highly sweaty socks in a
highly concentrated carbon dioxide environment
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Measure 40g of sucrose and 2g of yeast and place them into a conical flask
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Measure 100g of water and add it to the contents of the flask
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3
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4
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Allow 5-10 minutes
for fermentation to commence
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Place the next box with the unused sock on a bench/desk in the laboratory
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Record the number of mosquitoes attracted to the socks in both experiments at
10 minute intervals for a total of 30 minutes in the table below
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Repeat the experiment 3 times and record all observations
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Interpretation of Data:
if more mosquitoes are attracted to the sweaty socks in ‘A’, then sweat and
carbon dioxide are two attractants of mosquitoes to humans and the
hypothesis is correct
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Female mosquitoes are attracted to carbon dioxide and
can detect this substance from over 164 feet away
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In addition to carbon dioxide, mosquitoes are also attracted to substances
secreted when humans sweat
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Hence sweat and carbon dioxide are two of the main attractants of
mosquitoes
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Assumption:

the fermentation process will provide sufficient CO2 for the attraction of
mosquitoes
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Expected conclusion: More mosquitoes will be attracted to the sweaty socks because of the
presence of sweat and carbon dioxide
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Aim:

To determine the effect of waterlogged soil on the production of packchoy plants
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Prepare 2 plant trays (6” wide X 4” depth X 48” long) with soil, filled
with humus from your yard
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2
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3
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4
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Continue to water
the plants in tray ‘B’ twice per day
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Record all observations in a suitable table
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Repeat all experiment using two other sets of plants
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Treatment of Results: If the pack-choi plants in tray ‘A’ produces less crops then the hypothesis
is correct
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Soils that have too much water cause plant
to become anoxic (oxygen deprived)
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Additionally, oxygen
requirement of plants exceeds what is available in soils saturated with
water
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Sources of Error:

- adding too much water to plants
- rainfall during experiment

Assumptions:

5L of water added to plants at 3 hour intervals is sufficient to compensate
for consistent rainfall
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