Control variable: incubation time

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zarahh09
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#1
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How do we control it?
Why do we need to control it?

Someone please helpppp
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Purple43Monkey
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Use a stopwatch or a timer and incubate for the same length of time for all experiments. Do you have more details about what practical this is for? Presumably it's to help the results be valid and comparable.
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zarahh09
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(Original post by Purple43Monkey)
Use a stopwatch or a timer and incubate for the same length of time for all experiments. Do you have more details about what practical this is for? Presumably it's to help the results be valid and comparable.
Thank youu
Using aseptic teachnique to find out effect of antibiotic on bacteria

I feel like I am just saying for valid results for all the control variables
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Purple43Monkey
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:grin: yeah control variables are pretty repetitive -it's always 'fair testing' and all that!! Hopefully someone else might have another idea
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Mariiiiam
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i would normally say " incubate at a temperature of 25c for 24 hours " this way i included controlling both temp and time for the antibiotics im testing not sure if this applies for all exams but im doing biology A2 edexcel and this is what our teacher has told us
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Purple43Monkey
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(Original post by Mariiiiam)
i would normally say " incubate at a temperature of 25c for 24 hours " this way i included controlling both temp and time for the antibiotics im testing not sure if this applies for all exams but im doing biology A2 edexcel and this is what our teacher has told us
I would agree - it's always best to give specific details (they don't have to be entirely accurate, just realistic and appropriate for whatever experiment you are doing) as sometimes mark schemes want you to state things such as a temperature and time
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