Edexcel GCE Biology Unit 4 6BI04 June 2013

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can someone explain jan 2012 6)a)ii

does anyone have a link to the Jan 2013 paper by any chance? Absolutely ****ting myself for this one.. I've revised everything from the CPG textbook but the questions on the exam and mark scheme are soo different! I don't always understand the way they are worded and some seem so irrelevant to the specification. And I need to get a B in this to get into uni :frown:

do you think unit 5 is easier?

Reply 342

SKK94

Original post by iwantopas19

can someone explain jan 2012 6)a)ii

They are asking for overall percentage increase from Jan to May.
So first, find the values of NPP at each month
Jan = 1 gm^2
May = 11 gm^2
Percentage increase = (difference/ initial value) x 100
= (11 - 1)/10 x 100
= 1000 %

(edited 10 years ago)

Reply 343

diggy

Original post by S-Angel

do you think unit 5 is easier?

Search freeexampapers.com

Posted from TSR Mobile

Reply 344

Nathan@

Original post by iwantopas19

can someone explain jan 2012 6)a)ii

It asked for the percentage increase of NPP between jan to may so at jan NPP was 1 and in May its 11 so percetnage change is 11-1=10 and 10/1 *100 which = 1000%

Reply 345

Nathan@

does anyone know what exactly we have to know about TB and what kind of big mark questions they can ask. thx

Reply 346

nukethemaly

1. Chloroplasts in photosynthesis

2. Photosynthesis
-Energy from light to break up water
-Hydrogen stored as a fuel in glucose by combination with CO2 and releasing O2
3. Light dependent reactions
4. ATP as energy
5. Light independent reactions
6. Use of light independent reaction product
7. NPP + GPP
8. Trophic levels
9. Carbon cycle
10. Biotic and abiotic factors
11. Ecology study
12. Niche
13. Succession
14. Global warming cause and effect
15. Temperature and enzyme activity
16. Temperature and development
17. Evidence for global warming
18. Global warming controversial evidence
19. Change in allele frequency due to mutation/natural selection
20. BLANK
21. Speciation
22. Antibitoic resistance
23. Accepting evidence due to peer review etc.
24. Nature of the genetic code
25. Protein synthesis
26. Exons
27. DNA profile
28. PCR
29. Gel electrophoresis
30. Bacteria Vs. viruses
31. Decomposition by micro-organisms
32. Barriers to infection
33. Specific bacterial and viral diseases (i.e. TB and HIV)
34. Non-specific immune system
35. Cells etc. within the immune system (e.g. T-cells, antibodies, etc.)
36. Immunity
37. Antibiotic types (static/cidial)
38. Antibiotic effects ('Clear zone' practical)
39. Death-forensics

I tried to make a clearer list by editing the numbers on into paint. I made a mistake at number 20 though, so please overlook that!

Thanks to Brad0440 for the initial list!

(edited 10 years ago)

download1.jpg75.2KB

Reply 347

Brad0440

Original post by nukethemaly

Ah, thanks! That's quite clever, I might do the same for unit 5 :smile:

I was going to do one for that after my chemistry exam on Wednesday. :P

Reply 348

S-Angel

Original post by diggy

Search freeexampapers.com

Posted from TSR Mobile

thanks!

Reply 349

C94

Original post by Sravya

What have you got in the other modules?

Quite bad actually,

Unit 1 = 77 UMS
Unit 2 = 78 UMS
AS Coursework = 54 UMS
A2 Coursework = 39 UMS, <---This has not been confirmed yet though. I think it is worth more.

So that is 248 UMS altogether

420-248=172 Ums

172/2 = 86 UMS per paper, is that right?

Reply 350

nukethemaly

Original post by Brad0440

I was going to do one for that after my chemistry exam on Wednesday. :P

OCR B by any chance?

Reply 351

Nathan@

Original post by Brad0440

I was going to do one for that after my chemistry exam on Wednesday. :P

Do you mind, by looking at the sheet you made making predictions on what will come up in unit 4. thanks :smile:

Reply 352

C94

How confident are people with this exam, on a scale of 1 to 5?

5 - Really Confident................1 - Going to Fail

I feeling "3" at the moment

Reply 353

Nathan@

Weird thing is i found the jan 2013 much harder than the previous years yet huge grade boundary. Anyone else?

Reply 354

raves

i really dont know how to answer those big global warming questions! can someone help me out? like what we have to know?

Reply 355

nukethemaly

Original post by raves

i really dont know how to answer those big global warming questions! can someone help me out? like what we have to know?

•

causes

•

greenhouse effect

•

greenhouse gases

•

effects: think about this in terms of social, economical, and evironmental (thats the most important one)

•

evidence for it

•

evidence against it

•

scientific community and their involvement in getting this evidence

Reply 356

Nathan@

Can anyone explain the clonal selection

Reply 357

iwantopas19

Original post by SKK94

haha..

sucha simple one ehh. thanks again, wonder how many more times ive to thank you :wink:

Reply 358

iwantopas19

Original post by Nathan@

It asked for the percentage increase of NPP between jan to may so at jan NPP was 1 and in May its 11 so percetnage change is 11-1=10 and 10/1 *100 which = 1000%

thanks

Reply 359

swahmad

Original post by raves

i really dont know how to answer those big global warming questions! can someone help me out? like what we have to know?

Carbon dioxide and methane are greenhouse gases (methane has a stronger greenhouse effect)
Absorb ifra red radiation
Traps heat
Warms Earth, greenhouse effect