AQA A Level Biology Paper 1 7402/1 - 9 Jun 2022 [Exam Chat]

also i dont do maths,does anyone know if we get given area and volume equations ?

Reply 181

_notursavior

11

Original post by sunshine11111

does anyone know if we get given the ficks law equation for diffusion ?

I don't think we'll be tested on that, as someone else said it's not mentioned on the spec or not been on any questions I have seen.

Original post by sunshine11111

also i dont do maths,does anyone know if we get given area and volume equations ?

I remember a question where they gave the equation for the volume of a cylinder etc so I assume for the more complex shapes they will give us the formulas.

Reply 182

also u know when the tissue fluid has not left yet,we call it plasma right not tissue fluid when its still in capillary

Reply 183

also are u guys going thru the practicals not on advanced list ? even though miss estruch said they wont come up,she said they may be tested throughout

Reply 184

Original post by sunshine11111

also u know when the tissue fluid has not left yet,we call it plasma right not tissue fluid when its still in capillary

I think you just call it blood. Or refer to the molecules. like

due to high hydrostatic pressure, water and other small molecules such as glucose and ions etc are forced out..........

Though I think it technically is plasma, I've usually seen it referred to as water and or other small molecules in mark schemes

(edited 1 year ago)

Reply 185

Original post by sunshine11111

no but i asked coz i wouldnt really know what to say

I'm not sure I've ever seen it as a question but I'd probably hazard a guess at (many cristae folds gives a large surface area, containing many electron transport chains/ATP synthase, allowing a greater surface area for respiration/ oxidative phosphorylation / synthesis of ATP.

Reply 186

Rara345

17

Original post by sunshine11111

hi guys,

if u were asked explain how the structure of the mitochondria is related to its function ? what would u say

also for chloroplast. i cant think of much adaptations

For chloroplst they have a network of proteins in grana which holds the chlorophyll in a specific position to maximise light absorbance. They have DNA and Ribosomes inside them to make the proteins required for photoynthesis and their stroma contains all the enzymes needed for light dependant stage.

For mitochondria ig many cristae for greater SA and the matrix having proteins, ribosomes and DNA and stuff so they can also produce proteins for respiration.

Reply 187

does anyone know how to explain how farming has reduced biodiversity ?

Reply 188

Rara345

17

I feel like this is kinda simple, but when do you say/how do you know to say greater surface area to volume ratio, rather then just greater surface area?

(edited 1 year ago)

Reply 189

Original post by sunshine11111

does anyone know how to explain how farming has reduced biodiversity ?

you're got monoculture, overgrazing, pesticides/herbicides, hedgerow removal, woodland clearance and selective breeding, then you just have to say it results in fewer species. So hedgerows can provide habitats for many species, removing hedgerows destroys these habitats, resulting in fewer species in the area = less biodiversity.

Reply 190

Original post by othello03

you're got monoculture, overgrazing, pesticides/herbicides, hedgerow removal, woodland clearance and selective breeding, then you just have to say it results in fewer species. So hedgerows can provide habitats for many species, removing hedgerows destroys these habitats, resulting in fewer species in the area = less biodiversity.

thank uuuuuuuu

Reply 191

Original post by Rara345

I feel like this is kinda simple, but when do you say/how do you know to say greater surface area to volume ratio, rather then just greater surface area?

SA:V ratio is only really for when you're talking about gas exchange on an entire organism level. It's not a big topic and there's not many. Surface area is for everything (alveoli, capillaries, ileum etc), SA:V ratio is like "why does a human need a specialised gas exchange system?" and it's because humans are large multicellular organisms with a small SA:V ratio, so we can't exchange gases directly across our surfaces as the pathway would be too long, so we need a specialised gas exchange system.

Reply 192

Original post by othello03

you're got monoculture, overgrazing, pesticides/herbicides, hedgerow removal, woodland clearance and selective breeding, then you just have to say it results in fewer species. So hedgerows can provide habitats for many species, removing hedgerows destroys these habitats, resulting in fewer species in the area = less biodiversity.

do u know how to balance between farming and this ? other than crop rotation

Reply 193