edexcel biology unit 2 and 3b

Hi all,
i'm sitting for bio unit 2 and 3b in may and needed tips.bio unit 3b is on mon.
anyone else doin it?

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im taking it too on monday, im so freaked out! i dont know how to study for the test ! i guess a tip i can give you is that make sure you know what variables to control in the experiment and what could be altered to improve an experiment. Also, for question 2 , READ CAREFULLY. They have like secret hidden important sentences that they ask you questions about and you have to figure out what exactly they mean.

Reply 2

smj

Thanks.i'm nervous for it.
The practical of effect on heart rate on daphnia,what's the dependent and independent variable

Reply 3

dunia.hatabeh

Independent: caffeine concentration
Dependent: heart rate of Daphnia

good luck! :wink:

Reply 4

smj

Good luck 2 u too!
How do u improve this experiment?

Reply 5

dunia.hatabeh

here are some evaluatiion issues that could happen , so improve the experiment by 'fixing' these issues :
-Ensuring Daphnia were same size
-If left too long under microscope, temp increases (due to lamp) = increased heart rate
-Ensuring enough data is collected
-Too high concentration of caffeine kills Daphnia Counting of heart beat can be inaccurate

Reply 6

danger-.-

guyz i need help ! i need things to solve with a mark scheme !!!
thx ! :wink:

Reply 7

demdil

I'm taking it both of the exams too :/ Do you have any predictions about which experiment can come in the exam tomorrow?

Reply 8

moha_raghib

yeaahh can any1 please update the probability of any experiments which can come up tommorrooww and the analysis of those practicles thanx a toneee :smile:

Reply 9

jerichi

Does anyone have the jan 2012 paper for bio unit 3B?!

Reply 10

demdil

i saw that in 2012 paper they asked about bibliography. İn what order should a bibliography be? What do we have to know about a bibliography?

Reply 11

Lujain Al Omari

Original post by jerichi

Does anyone have the jan 2012 paper for bio unit 3B?!

i do, give me ur email and i'll send it to u :smile:

Reply 12

Lujain Al Omari

Original post by demdil

i saw that in 2012 paper they asked about bibliography. İn what order should a bibliography be? What do we have to know about a bibliography?

first come the web-based references
then come the non-based refernces

ways to improve bibliography: type in URL for web-based references and add the date data was collected by the source

Reply 13

demdil

Original post by moha_raghib

yeaahh can any1 please update the probability of any experiments which can come up tommorrooww and the analysis of those practicles thanx a toneee :smile:

i looked at which experiments came in the exam before, and i think
1)daphnia
2)observing mitosis
3)totipotency & tissue culture
may come . (i know that they didnt come in new sylabus p3 , so they may come) what do you think? any ideas? if i'm wrong correct me. i dont have the specimen. But i think that daphnia was in specimen so we will have two experiments left; mitosis/totipotency.

Reply 14

demdil

Original post by Lujain Al Omari

first come the web-based references
then come the non-based refernces

ways to improve bibliography: type in URL for web-based references and add the date data was collected by the source