[Cetacea]

(Original post by arnab)
heyy can you explain to me about what you need to know about peat bogs? I cant get that in my head

Pollen in peat bogs can provide information about past climates. Peat is an accumulation of dead organic matter (detritus), mainly the remains of dead plants. The conditions in a peat bog are acidic and anaerobic, meaning the rate of decay of plant material in a peat bog is slowed or stopped.

Pollen grains are well preserved in peat and are useful in reconstructing past climates because:
-They are produced in large amounts
-Pollen grains are resisant to decay due to their tough outer layer
-Peat forms in layers: the deeper the layer, the older the peat
-Each species of plant has a distinctive type of pollen. Therefore by examining the pollen in the peat, scientists can determine the species of plants that lived during that time, therefore get an idea of the climate.

Scientists construct a pollen diagram based on the abundance of pollen grains in a sample. (Search on internet for lots of sample pollen diagrams).

Hope that helps.

[arnab]

(Original post by Cetacea)
Pollen in peat bogs can provide information about past climates. Peat is an accumulation of dead organic matter (detritus), mainly the remains of dead plants. The conditions in a peat bog are acidic and anaerobic, meaning the rate of decay of plant material in a peat bog is slowed or stopped.

Pollen grains are well preserved in peat and are useful in reconstructing past climates because:
-They are produced in large amounts
-Pollen grains are resisant to decay due to their tough outer layer
-Peat forms in layers: the deeper the layer, the older the peat
-Each species of plant has a distinctive type of pollen. Therefore by examining the pollen in the peat, scientists can determine the species of plants that lived during that time, therefore get an idea of the climate.

Scientists construct a pollen diagram based on the abundance of pollen grains in a sample. (Search on internet for lots of sample pollen diagrams).

Hope that helps.

thank you!

[arnab]

(Original post by M Kh)
How do you revise?
x

(Original post by d_94)
Do you have any notes for Unit 4 you can up-load?

(Original post by This Honest)
Learn info>x

Are any of doing the papers from the old syllabus for this paper? If so, which ones are you doing. I just checked on xtremepapers and there are 4A, 4B and 4C to do.....not sure which should start on

Any advice could be well appreciated!

[M Kh]

(Original post by arnab)
Are any of doing the papers from the old syllabus for this paper? If so, which ones are you doing. I just checked on xtremepapers and there are 4A, 4B and 4C to do.....not sure which should start on

Any advice could be well appreciated!

Solve the qns in textbook and rev. guide.

[aqua05]

heey people..im really freaking out.. as i need an A in bio... was wondering whats the best way to ace this exam.. from what year are you guys doing the past papers from ?
any tips on how to revise??

[arnab]

(Original post by M Kh)
Solve the qns in textbook and rev. guide.

I have already done that.....i am just doing these topic by topic questions that i found on the internet.
Any advice regarding the old syllabus?

[arnab]

(Original post by aqua05)
heey people..im really freaking out.. as i need an A in bio... was wondering whats the best way to ace this exam.. from what year are you guys doing the past papers from ?
any tips on how to revise??

Going through the revision guide, memorising it off by heart and then doing tons and tons of questions.....any question i can get my hands on

Edit : are you doing papers from the old syllabus?

[aqua05]

(Original post by arnab)
Going through the revision guide, memorising it off by heart and then doing tons and tons of questions.....any question i can get my hands on

Edit : are you doing papers from the old syllabus?

yes i am till what year do you suggest we do from ?
Which revision guide are you revising from ? I'm using cgp & the SNAB one..

[This Honest]

(Original post by arnab)
Are any of doing the papers from the old syllabus for this paper? If so, which ones are you doing. I just checked on xtremepapers and there are 4A, 4B and 4C to do.....not sure which should start on

Any advice could be well appreciated!

I haven't yet but will do

[aqua05]

heyy guys...
I was just thinking of this question..

Describe the roles played by the photosystems (PSI & PSII)

What would you guys say?

[vampirerahim]

(Original post by arnab)
Are any of doing the papers from the old syllabus for this paper? If so, which ones are you doing. I just checked on xtremepapers and there are 4A, 4B and 4C to do.....not sure which should start on

Any advice could be well appreciated!

Hey listen
download this
It has questions from older syllabus that are still useful to our syllabus
compiled chapter wiseeeeee
epic stuffff

http://www.mediafire.com/?s1ctvexdb9u57xb

135 pages of ecoglogy questions :P

[arnab]

(Original post by This Honest)
I haven't yet but will do

which ones are you doing for unit4? 4A or 4B or 4C?

[arnab]

(Original post by vampirerahim)
Hey listen
download this
It has questions from older syllabus that are still useful to our syllabus
compiled chapter wiseeeeee
epic stuffff

http://www.mediafire.com/?s1ctvexdb9u57xb

135 pages of ecoglogy questions :P

I already have this but thank you anyway. Your help is well appreciated

[aqua05]

heey guys

Can someone please please answer this question for me???

Describe the role of the scientific community in validating new evidence (including molecular biology, eg DNA, proteomics) supporting the accepted scientific theory of evolution (scientific journals, the peer review process, scientific conferences).

Discuss how a person's point of view might affect the conclusions they reach about actions to take on global warming

Describe the modelling of trends in global warming and the limitations of this approach

Explain how the concept of niche accounts for distribution and abundance of organisms in a habitat.

[aqua05]

Can someone please please help me answer this question??

Question.

Explain how changes that happen aftyer transcription can give rise to more than one protein from one gene??

[demdil]

(Original post by aqua05)
Can someone please please help me answer this question??

Question.

Explain how changes that happen aftyer transcription can give rise to more than one protein from one gene??

after transcription there are post transcriptional changes(also known as pretranslational changes) introns are separated, exons can be arranged in different ways, so different proteins can be made when different sections of mRNA are spliced together before translation. i didnt explain it well i guess, but you gave to study to the RNA splicing basically. The questions about that

[aqua05]

(Original post by demdil)
after transcription there are post transcriptional changes(also known as pretranslational changes) introns are separated, exons can be arranged in different ways, so different proteins can be made when different sections of mRNA are spliced together before translation. i didnt explain it well i guess, but you gave to study to the RNA splicing basically. The questions about that

SUPER
Thanks ! i got it

How are you studying for this unit ??

[demdil]

(Original post by aqua05)
SUPER
Thanks ! i got it

How are you studying for this unit ??

i havent started studying yet but i will go through the book once and then do the past papers and then if i have time do the old syllabus papers how are you studying? i guess we have the same exams (chem units 4/5 etc) .. are you finding time for this unit?

[aqua05]

(Original post by demdil)
i havent started studying yet but i will go through the book once and then do the past papers and then if i have time do the old syllabus papers how are you studying? i guess we have the same exams (chem units 4/5 etc) .. are you finding time for this unit?

Im going over unit 4 right now.. coz I keep forgetting certain details... there's like so much to study maaaaan like 5 papers to go.. how many for you.. I wanna do the old syllabus ones.. but will see if I have tikme

[demdil]

(Original post by aqua05)
Im going over unit 4 right now.. coz I keep forgetting certain details... there's like so much to study maaaaan like 5 papers to go.. how many for you.. I wanna do the old syllabus ones.. but will see if I have tikme

i have 5 exams left too unit 4/5 biology and chemistry and maths c4 .. ahh too much :/ and i keep wasting time as if its the summer holiday or smthng.. because i'm tired of these examss..