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OCR Biology F211 (cells, exchange and transport) - 11th Jan 2012

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Reply 20

roflcopter123

Hmm how to revise, do past spec papers and use open booK???

Reply 21

Freddy12345

You need to understand how to apply it to a question in an exam. If you just learn something but you can't apply it to the situation given in the exam, then well, it will not work out.

Reply 22

otrivine

Original post by med123

anybody have the june 2011 f211 paper. I hve the ms

really can i have the mark scheme please mate :wink:

thanks

Reply 23

otrivine

Original post by med123

do u have the paper

no but i will get it this week though can you upload the MS as well :wink:

do you have the unit 2 as well MS thanks

Reply 24

ieatcheeseyo

Is this right?
Water has a water potential of Zero.
Cells or Soultions have a LOWER? Potential, and they're -xkPa?

Can someone please simplifiy the whole water potential water gradient thing?

Reply 25

ZeeshanG

Pure water has a water potential of zero, everything else is lower than that, so it will be -xkPa. Water moves from a high to low water potential (towards the MORE NEGATIVE value).

Reply 26

ManPowa

Can anyone explain simply (main marking points) the transport of water from the roots to the top of the plant??

Reply 27

biologyhelp!

Original post by med123

when can u get the paper

i can have the paper tomorrow, but i need the mark scheme now please :d

Reply 28

079

Original post by ManPowa

Can anyone explain simply (main marking points) the transport of water from the roots to the top of the plant??

straightttt from the mark schemeee

In the leaf:
idea of :
1 water loss (from leaf) is replaced ;
2 via, apoplast / symplast / vacuolar, pathways ;
3 down water potential gradient / AW ;
4 (lost water replaced) by water from the xylem ;
In the xylem:
5 (loss of water) causes, low / negative, (hydrostatic)
pressure (at top / in leaf)
OR
creates pressure gradient ;
idea of :
6 water moves, from higher pressure to lower pressure /
down pressure gradient ;
7 under tension / pulled up / drawn up ;
8 by mass flow ;
9 cohesion / attraction, between water molecules ;
idea of :
10 column / stream / chain, of water (molecules) ;

Original post by med123

hey if you can giv me the paper, ill giv the ms

stop being stingy, post the thing already!

Reply 29

079

lets ask questions and answer questions.

also does anyone have any predictions as to what may come up?

Reply 30

med123

i think plants because june 2011 lots of animal stuff come up

Reply 31

otrivine

Original post by biologyhelp!

i can have the paper tomorrow, but i need the mark scheme now please :d

please upload the paperrr ill give u the MS

Reply 32

-Haz-

Original post by 079

also does anyone have any predictions as to what may come up?

It’s hard to say because we’ve got to a stage where pretty much everything has come up at least once. I couldn’t really find anything that hasn’t come up at all when I was looking through the past papers. However there are several things that haven’t been covered in a question worth 5+ marks:
Microscopes
Division of labour (e.g. protein synthesis)
Communication and cell signalling
Mitosis
Stem cells
Blood vessels
Breathing

I have a feeling mitosis will come up.. and also microscopes.
I’m expecting lots of plant stuff – transpiration and translocation seem to be popular with examiners so just because they’ve come up quite a lot before I'm not ruling them out.

Reply 33

Amiraa

Can people help me with:
surface-area-to-volume ratio
close and open circulation
and most importantly double or single circulation.

Can you but it as simply as possible, as i've been trying to understand this for months now (i have an idea of it, but my problem is how to but it in words really).
All help are appreciated :smile:

Reply 34

Natalie21

Original post by Amiraa

Single circulation = blood goes through heart once per each cardiac cycle.

Double circulation = blood goes through heart twice per each cardiac cycle - there are two separate circuits the systemic and the pulmonary.

Reply 35

Mubarak.M

can some1 plzzzz give me a few ways to do sum good revision. I've already started but i need a few revision tips

Reply 36

Joy0712

Original post by Mubarak.M

can some1 plzzzz give me a few ways to do sum good revision. I've already started but i need a few revision tips

I'm preparing for this exam the second time and I feel much more confident cause I made mind maps for each topic and now I'm practicing past papers

Reply 37

Mubarak.M

thanks for the tip, this is my first time doing the exam so i don't really know what to expect, i'm going to try out a few papers. how did u find this exam the first time?