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AQA BIOL2~3rd June 2013~AS Biology (Now Closed)

Reply 2720

elja1905

4

King Prawn Curry Or Fat Greasy Sausages?

Reply 2721

kiyubi

9

Original post by daniel1005

I honestly could not guess and don't want to guess. I tried to guess for BIOL1 and learnt the topics I guessed in depth and it wasn't those. I think it could be something to do with meiosis (how does meiosis cause variation), or something to do with haemoglobin and oxygen dissociation curve or even a question about plant transport. It really could be anything you just have to prepared for anything.

okay lol! Thanks anyway=]

Reply 2722

lorobolorolo

7

Original post by Nav_Mallhi

How ironic! :biggrin:

That's what I was thinking :smile:

Reply 2723

Thebest786

2

How does plants rolling up the leaves and a reduced leaf surface area reduce transpiration?
Also, does light have the same effect as temperature on transpiration (increasing kinetic energy and water evaporating)

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Reply 2724

Zebrajess

9

Original post by Aidn

Can someone explain to me tension/negative pressure in the context of Jan 12 Q.8(b)(iii) -_-

Water evaporates from the leaves of the upper branches, so the water movement starts there (as opposed to starting in the trunk). This creates tension which pulls water up the tree.

Reply 2725

jess28039

Original post by anonymousecheese

my one is: King Posiedon Could Only Find Grey Seaweed :smile:

haha, we got told King Prawn Curry Or Fat Greasy Sausage :tongue:

Reply 2726

Suzanna5678

Original post by annaelizabet

Anyone want to go over last minute revision? :smile:

I am here! and happy to help

Yeah can we do it via text message cause this is so annoying refreshing and stuff on my phone !

Reply 2727

daniel1005

4

Original post by LiamDaly

[6] how does meiosis cause genetic variation. What do you day for 6 MRKS!!

Please?

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•

Independent segregation

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New combinations of maternal and paternal c'somes

•

Crossing over

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Transfer sections of chromatid

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DNA from one chromatid to another between homologous pairs when they align on the equator (bivalents)

•

Mutation - the changing of the structure of the polypeptide chain coding for a gene causing variation.

Reply 2728

annaelizabet

6

Original post by marseille_h

Hello, for the questions on magnification i always get 1 mark for putting = size of image/actual size of specimen

But not the right result on the mark scheme. For the January 2010 exam can someone tell me how they did question 1(b)(ii). Maybe its the units or something else i dont understand. And more recently the question 1(d) in the January 2013 paper.

Thanks in advance :smile:

I'd be happy to help! where did you find the jan 2013 paper?

Reply 2729

anonymousecheese

2

Original post by marseille_h

Hello, for the questions on magnification i always get 1 mark for putting = size of image/actual size of specimen

But not the right result on the mark scheme. For the January 2010 exam can someone tell me how they did question 1(b)(ii). Maybe its the units or something else i dont understand. And more recently the question 1(d) in the January 2013 paper.

Thanks in advance :smile:

same here i got 32000um/20um=1600X
which is wrong :angry:

Reply 2730

2013leaver

5

Original post by Thebest786

How does plants rolling up the leaves and a reduced leaf surface area reduce transpiration?
Also, does light have the same effect as temperature on transpiration (increasing kinetic energy and water evaporating)

Posted from TSR Mobile

Rolling up leaves traps a layer of stiil air, reducing the water potential gradient between the stomata and surrounding air, reducing transpiration.

Light only causes stomata to open, nothing else. stomata must be open for transpiration

Reply 2731

ajv1000

Original post by jess28039

haha, we got told King Prawn Curry Or Fat Greasy Sausage :tongue:

Hehe Keep pots clean or family gets sick

Reply 2732

hali123

Anybody got any how science works notes?

Reply 2733

Zebrajess

9

Original post by Thebest786

How does plants rolling up the leaves and a reduced leaf surface area reduce transpiration?
Also, does light have the same effect as temperature on transpiration (increasing kinetic energy and water evaporating)

Posted from TSR Mobile

Rolled up leaves trap water vapour from the plant, reducing the concentration gradient, so less water evaporates from the plant.
Smaller surface area means fewer stomata for the water to evaporate from.
Light makes the stomata open, so transpiration increases. Nothing to do with kinetic energy.