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sources of error...

In my coursework I have to list at least five errors/limitations.
(title: temperature v. rate of respiration of maggots)

So far all I have is:

(1) not enough time = less data = less accurate results??
(2) temp. water bath is set is not equal to actual temp. =
(3) maggots were tired = less movement = low rate of respiration
(4) tube containing maggots may not have been air tight = change in air pressure??
(5)-


improvements to avoid these errors/limitations:

(1) conduct experiment for a longer period
(2) use a thermometer to check temp. of water bath and adjust it if necessary
(3)allow a longer resting period between a certain no. of repeats
(4)(????)
(5)-

Can someone please help me?
Reply 1
Avatar for fabbo
fabbo
biological variation in maggots - use maggots all of same age/type
limited degree of precision on thermometer - use a digital thermometer

thats all i could think of?
Reply 2
Avatar for Oladz
Oladz
15
As above in regards to biological variation of maggots and/or same mass of maggots for the repeats.
Reply 3
Avatar for thephonics
thephonics
For the improvment to number 3 instead of using the same maggots for each repeat use new maggots for each repeat ensuring they are the same age (e.g. newly hatched) and use the same mass of maggots.
How you measured the volume of carbon dioxide produced - say use different apparatus ...

Also they only produced a little bit of gas, you could then calculate % error and say as there was so little it allowed more room for error as you probs had to round up ...

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