AQA A-Level Biology Exam Question help

My AQA bio a level paper 1 is tomorrow so can someone please please help explain how to get to the answer of these questions? (All different questions)

https://i.imgur.com/4dziczE.jpeg

https://i.imgur.com/9prcFnk.png

https://i.imgur.com/39nbObz.jpeg

https://i.imgur.com/xp81YN9.jpeg

Even if you can just help with one, that would be great!! Thank you sooooo much

Reply 1

Geo Lover 7

Chat Forum Helper, Study Forum Helper

Original post

by ineedamiracle

My AQA bio a level paper 1 is tomorrow so can someone please please help explain how to get to the answer of these questions? (All different questions)
https://i.imgur.com/4dziczE.jpeg
https://i.imgur.com/9prcFnk.png
https://i.imgur.com/39nbObz.jpeg
https://i.imgur.com/xp81YN9.jpeg
Even if you can just help with one, that would be great!! Thank you sooooo much

@always-anxious can you help?

Reply 2

Geo Lover 7

Chat Forum Helper, Study Forum Helper

Original post

by ineedamiracle

Hi.

I've moved your thread to Biology Study Help for you. :tongue:

Reply 3

always-anxious

Chat Forum Helper, Study Forum Helper

Original post

by Geo Lover 7

@always-anxious can you help?

Sorry, I'm not the best at the maths questions either and I don't know the answers to these questions :frown:

Reply 4

Geo Lover 7

Chat Forum Helper, Study Forum Helper

@DerDracologe or @Trickia can you help?

Reply 5

Trickia

Study Forum Helper

Original post

by ineedamiracle

My AQA bio a level paper 1 is tomorrow so can someone please please help explain how to get to the answer of these questions? (All different questions)
https://i.imgur.com/4dziczE.jpeg
https://i.imgur.com/9prcFnk.png
https://i.imgur.com/39nbObz.jpeg
https://i.imgur.com/xp81YN9.jpeg
Even if you can just help with one, that would be great!! Thank you sooooo much

1st one slightly confused if I had the mark scheme I would probably get it
For the second one you use the original equation however do not combine the magnification equation with percentage uncertaincy. Also you haven't converted your units. So you have to be careful as it catches a lot of people out and a silly way to lose marks!
3rd one don't have the figure so I'm unsure about that
4th one haven't done stomata density but you have gotten your conversion from micrometer to millimeter wrong I think

Reply 6

natylamine

hello

for the first one you will need to use the graph on the previous page (other than the diagram you have over here) and read where -7 volts is and it gives you a reading of around -1.95 MPa.
You will use the diagram you have over here and find -1.95 MPa to find the percentage increase which will be 15%. You then do 1.15*60 + 69 cm². They said to calculate by how much did it increase so you do 69-60=9
i hope that helps, please feel free to ask for any clarification!
goodluck for tomorrow! :rave:

Reply 7

natylamine

Original post

by ineedamiracle

My AQA bio a level paper 1 is tomorrow so can someone please please help explain how to get to the answer of these questions? (All different questions)
https://i.imgur.com/4dziczE.jpeg
https://i.imgur.com/9prcFnk.png
https://i.imgur.com/39nbObz.jpeg
https://i.imgur.com/xp81YN9.jpeg
Even if you can just help with one, that would be great!! Thank you sooooo much

for the 3rd one - you will have to read off the graph for the stomatal density for CO₂concentration for 300 ppm and 365 ppm then subtract them which will give you 203-178=25.
They have asked to give it over a 10 year period, from 2000 to 1910 is 90 years so to get that to a 10 year period you divide it by 10 to give you 9.
Then you simply do 25/9= 2.7 recurring.
hope this helps :smile:

Reply 8

natylamine

Original post

by ineedamiracle

My AQA bio a level paper 1 is tomorrow so can someone please please help explain how to get to the answer of these questions? (All different questions)
https://i.imgur.com/4dziczE.jpeg
https://i.imgur.com/9prcFnk.png
https://i.imgur.com/39nbObz.jpeg
https://i.imgur.com/xp81YN9.jpeg
Even if you can just help with one, that would be great!! Thank you sooooo much

for the last one - you need to count all the stomata they gave you in the picture which gives you 32 then you divide by three because they have asked you for the mean stomatal density in the 3 fields. This gives you 10.67 recurring.
They given you the size of the boxes (250 micrometers) and they want it in mm² so you convert by doing 250*10^-3=0.250 then will need to find the area by doing 0.250*0.250= 0.0625. So then all you will have to do is divide 10.67/0.0625=170.7 as they have asked for mean no. of stomata per mm².
hope this helps! :smile:

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