Philip-flop
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Can someone help me. I'm struggling with how to start answering this question. I don't know my practicals too well (or any equipment used in the practicals). Any advice would be very helpful!


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BiologyA2Student
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(Original post by Philip-flop)
Can someone help me. I'm struggling with how to start answering this question. I don't know my practicals too well (or any equipment used in the practicals). Any advice would be very helpful!


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Is this OCR biology bro?
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NNB_Herath
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(Original post by Philip-flop)
Can someone help me. I'm struggling with how to start answering this question. I don't know my practicals too well (or any equipment used in the practicals). Any advice would be very helpful!


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Wait...
I shall write the complete answer for you ...give me sometime ok
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Philip-flop
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(Original post by BiologyA2Student)
Is this OCR biology bro?
No it's Edexcel taken from Unit 1 - June 2009 exam (Q6 b)

(Original post by NNB_Herath)
Wait...I shall write the complete answer for you ...give me sometime ok
Thaaaaank you! I really appreciate it!
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NNB_Herath
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Store the Camu Camu fruit before making the juice in both the areas for different number of days.
Then make the juice from Camu Camu fruit by blending it with a mortar and a pestle.
Then titre it with a know volume and concentration of DCPIP solution.
Measure the volume of Juice needed to change colour from Blue to Colourless.
Repeat this with different storage time in both the areas and also repeat at same storage time to get average.
Calibration of DCPIP can be done with a standard solution of Vitamic C
Plot a graph for the two areas and compare
Controlled Variable -
Mass of fruit used to make juice in all trials
Temperature at storage
Volume of DCPIP
Concentraion of DCPIP
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NNB_Herath
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Ask me about other practicals too...
I also do the AS exam this May
Bio unit 1,2,and 3

Remember to follow me if you find it useful
Cheers....Good luck for your exams
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Philip-flop
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(Original post by NNB_Herath)
Store the Camu Camu fruit before making the juice in both the areas for different number of days.
Then make the juice from Camu Camu fruit by blending it with a mortar and a pestle.
Then titre it with a know volume and concentration of DCPIP solution.
Measure the volume of Juice needed to change colour from Blue to Colourless.
Repeat this with different storage time in both the areas and also repeat at same storage time to get average.
Calibration of DCPIP can be done with a standard solution of Vitamic C
Plot a graph for the two areas and compare
Controlled Variable -
Mass of fruit used to make juice in all trials
Temperature at storage
Volume of DCPIP
Concentraion of DCPIP
Wow, this is very useful!! Do you have any notes about the other practicals? I'm self-taught so don't have much about the core practicals
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NNB_Herath
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(Original post by Philip-flop)
Wow, this is very useful!! Do you have any notes about the other practicals? I'm self-taught so don't have much about the core practicals
This was not a note
I read your question.....then answered the question with my knowledge without looking at your marking scheme.....
By the way, I study the Practicals from Stafford Valentines Unit 3 book
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Philip-flop
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(Original post by NNB_Herath)
This was not a note
I read your question.....then answered the question with my knowledge without looking at your marking scheme.....
By the way, I study the Practicals from Stafford Valentines Unit 3 book
Wow, you are very good!!!

Can the Stafford Valentines Unit 3 book be used with the new 2015 Edexcel Bio spec?

Or is there any chance you could scan a few of the pages over to me? I'm in desperate need
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NNB_Herath
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(Original post by Philip-flop)
Wow, you are very good!!!

Can the Stafford Valentines Unit 3 book be used with the new 2015 Edexcel Bio spec?

Or is there any chance you could scan a few of the pages over to me? I'm in desperate need
I do not have the book either....my teacher gave me the notes too
Sorry dude...I would really help you if I could ..........

But ask me questions like this...i will send you the answer like this one... ok...
it is same for all the years...they repeat the same question (with slight differences)
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Philip-flop
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(Original post by NNB_Herath)
I do not have the book either....my teacher gave me the notes too
Sorry dude...I would really help you if I could ..........

But ask me questions like this...i will send you the answer like this one... ok...
it is same for all the years...they repeat the same question (with slight differences)
Damn. Any chance your teacher has these notes saved as a file that you could send over to me? I'm literally dying in my own panic
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NNB_Herath
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(Original post by Philip-flop)
Damn. Any chance your teacher has these notes saved as a file that you could send over to me? I'm literally dying in my own panic
He will never even give me a TEXT BOOK
I once asked him a book and he said he will give the MODIFIED NOTE (
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Philip-flop
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(Original post by NNB_Herath)
He will never even give me a TEXT BOOK
I once asked him a book and he said he will give the MODIFIED NOTE (
That's so good!! That way all the useless nonsense is cut out!
Am I being cheeky by asking you for these notes? :/
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NNB_Herath
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(Original post by Philip-flop)
That's so good!! That way all the useless nonsense is cut out!
Am I being cheeky by asking you for these notes? :/
Nopz........but send me questions like that so i will reply and send you a structured answer for all the practicals
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Philip-flop
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(Original post by NNB_Herath)
Nopz........but send me questions like that so i will reply and send you a structured answer for all the practicals
Thank you so much.

How about this question?
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NNB_Herath
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Place a know volume of Herbal tea in a slide.
Place the Daphnia in it and allow it to acclimatise for sometime before carrying out the experiment.
Place a cotton wool (to inhibit movement of daphnia) and a heater coil around the Daphnia (to maintain constant temperature-Controlled variable).
Place the slide under the microscope and observe the Daphnia's heart.
Count the beats every 30 seconds using a stopwatch and plot a graph and calculate mean heart rate.
Repeat this to get an average result.

Compare these heart rate data with a control set ( which could have been done before with standard concentrations of Caffeine or White Tea).




Additional Information for these types of Daphnia Questions (not needed for this)

Controlled Variables
Temperature (How to maintain =Using a heater coil around the Daphnia)
Size of Daphnia (How to maintain =using eggs from same mother Daphnia for all trials)
Source of Daphnia (How to maintain =from same place)
Pre-Treatment (How to maintain = (Acclimatising time same for all trials , etc)
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Philip-flop
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(Original post by NNB_Herath)
Place a know volume of Herbal tea in a slide.
Place the Daphnia in it and allow it to acclimatise for sometime before carrying out the experiment.
Place a cotton wool (to inhibit movement of daphnia) and a heater coil around the Daphnia (to maintain constant temperature-Controlled variable).
Place the slide under the microscope and observe the Daphnia's heart.
Count the beats every 30 seconds using a stopwatch and plot a graph and calculate mean heart rate.
Repeat this to get an average result.

Compare these heart rate data with a control set ( which could have been done before with standard concentrations of Caffeine or White Tea).




Additional Information for these types of Daphnia Questions (not needed for this)

Controlled Variables
Temperature (How to maintain =Using a heater coil around the Daphnia)
Size of Daphnia (How to maintain =using eggs from same mother Daphnia for all trials)
Source of Daphnia (How to maintain =from same place)
Pre-Treatment (How to maintain = (Acclimatising time same for all trials , etc)
Fantastic answer!!!
So do you have "model" answers for these practical questions?
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NNB_Herath
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(Original post by Philip-flop)
Fantastic answer!!!
So do you have "model" answers for these practical questions?
nopz.....
The answers differ from question to question so It would be a bit difficult to write the same answer.....try to learn the idea of each experiment
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NNB_Herath
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try reading this part .....this is all practicals in short
https://www.google.lk/url?sa=t&rct=j...19745492,d.dGo
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Sandy_Vega30
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(Original post by Philip-flop)
Damn. Any chance your teacher has these notes saved as a file that you could send over to me? I'm literally dying in my own panic
Hey. I have something you could use.
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