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

I hate them so much. When I finish a paper I'm confident with about 1/3rd of the marks. The one I just did had a 15 mark question on shrimps :frown:

Lol yea what was that about!

That was an evil paper.

I get so fed up of HSW.

Reply 941

PoorLoser

2

Original post by Simran Mars Foster

Lol yea what was that about!

That was an evil paper.

I get so fed up of HSW.

15 matk question? on shrimps??
what paper was that on??

edit: nvm found it, damn those are a set of weird questions!

(edited 10 years ago)

Reply 942

PhilA

Can someone please explain to me the surface area to volume ratio concept? I don't get it whatsoever!

Reply 943

Secret.

14

This is something that SO many people mix up and get confused by so I thought I'd clear it up

Hope it helps :smile:

Reply 944

Jimmy20002012

4

Original post by PhilA

Can someone please explain to me the surface area to volume ratio concept? I don't get it whatsoever!

The larger the animal the smaller surface area to volume ratio :smile:

Posted from TSR Mobile

Reply 945

Jaydude

11

Do we need to know ventilation in fish accurately? In step to step order? Could it be a 3 or 6 marker?

Also do we need to know circulatory system in detail, such as Renal and Hepatic veins/arteries?

Thanks!

(edited 10 years ago)

Reply 946

lorobolorolo

7

Does anyone know why shoots are cut at a slant in the potometer?

Reply 947

lorobolorolo

7

Original post by Jaydude

Do we need to know ventilation in fish accurately? In step to step order? Could it be a 3 or 6 marker?

Also do we need to know circulatory system in detail, such as Renal and Hepatic veins/arteries?

Thanks!

I'm not sure about the ventilation in fish, but I think we need to know about renal and hepatic veins, because a question on it came up in the june 2009 paper. However this paper is old so I'm not sure if we still need to know it.
But I'd learn it just in case :smile:

Reply 948

Jaydude

11

Original post by lorobolorolo

Does anyone know why shoots are cut at a slant in the potometer?

To increase the surface area and it's cut under water to prevent air entering the xylem.

Correct me if I am wrong anyone.

Reply 949

Tee Logan x

1

Guys, this is a random question but why do fish have hearts, if they have gills (for the uptake of oxygen)? I mean, we need a heart so that blood (which contains oxygen) can be pumped around the body but if fish have gills for that reason, what is the point of the heart?

Reply 950

Sophie1994

6

can someone explain to me how you would do magnification questions when the scale bar is given?

Reply 951

neelam123h

Can someone explain to me how could calculate magnificaction, actual size and image size.

Thanks.

Reply 952

Sapien

9

Original post by Tee Logan x

Guys, this is a random question but why do fish have hearts, if they have gills (for the uptake of oxygen)? I mean, we need a heart so that blood (which contains oxygen) can be pumped around the body but if fish have gills for that reason, what is the point of the heart?

so they can fall in love

Reply 953

Soontobesuper

16

Original post by Tee Logan x

Guys, this is a random question but why do fish have hearts, if they have gills (for the uptake of oxygen)? I mean, we need a heart so that blood (which contains oxygen) can be pumped around the body but if fish have gills for that reason, what is the point of the heart?

But they still have blood, In the Lammella, the Oxygen diffuses into their blood /Cappilaries to their cells. Blood needs to be pumped round somehow so I suppose they do...

Original post by Sapien

so they can fall in love

LOOOOOL that's SO CUTE *Pictures a Disney-esque Cartoon where their falling in love Dancing around...*

Reply 954

Tee Logan x

1

Original post by Sapien

so they can fall in love

lol the thought didn't even occur

Reply 955

Tee Logan x

1

Original post by neelam123h

Can someone explain to me how could calculate magnificaction, actual size and image size.

Thanks.

Magnification = image size /actual size
Rearrange this equation to get actual size and image size
Actual size = Image size/magnification
Image size = magnification x actual size

Btw image size and actual size have to be in the same units so some conversions might be necessary :smile:

Reply 956

homefind

Original post by PoorLoser

not quite!
you're doing psychology B :P
I'm doing psychology A
Apparently psychology B is higher? :redface:

ARGH!!!! literally hardly anyone on TSR is doing psychB haha :smile:

what do you mean 'higher'?

Reply 957

Sapphire123

Original post by PhilA

Can someone please explain to me the surface area to volume ratio concept? I don't get it whatsoever!

so in large organisms the surface area to volume ratio is smaller than the surface area to volume ratio in smaller organisms. A smaller surface area to volume ratio decreases the diffusion rate because in order to have efficient gas exchange a large surface area is required. Therefore organisms that have a small surface area to volume ratio their needs cannot be met unless they are inactive organisms. If they are not inactive then they may need a specialist exchange surface so their needs can be met like we have the double circulatory system.

Hope that helps :colondollar:

Reply 958

ImAz

6

When classifying DNA- using the comparison of proteins.

I don't understand it.
You create one precipitate which is from the original proteins mixed with the antibodies formed.
And then you get another separate protein from a different species and see how much precipitate is formed.

So are you comparing the closeness of the two species of how close they're related to the rabbit?

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Reply 959

dooobie_

What do people think will be on the big questions?

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

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