Azurite
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Hi everyone!

This thread is for discussing:
AQA Biology A2 Unit 4: Populations and Environment - 16th June 2016.

BIOL 4 TOPICS:

Section 1 - Populations
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Populations and Ecosystems
Investigating Populations
Variation in Population Size
Human Populations
Section 2 - Energy Supply
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Photosynthesis, Respiration and ATP
Photosynthesis
Limiting Factors in Photosynthesis
Respiration

Section 3 - Energy Flow and Nutrient Cycles
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Energy Transfer and Productivity
Farming Practices and Productivity
The Carbon Cycle and Global Warming
Effects of Global Warming
The Nitrogen Cycle and Eutrophication
Section 4 - Succession and Conservation
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Succession
Conservation
Conservation Evidence and Data
Section 5 - Inheritance, Selection and Speciation
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Inheritance
The Hardy-Weinberg Principle
Allele Frequency and Speciation
BIOL 4 PAST QUESTION PAPERS:BIOL 4 PAST MARK SCHEMES: RELATED THREADS:
AQA Biology A2 Unit 6X: A2 Externally Marked Practical Assignment (EMPA) 2016
http://www.thestudentroom.co.uk/showthread.php?t=3510295
AQA Biology A2 Unit 5: Control in Cells and In Organisms - 23rd June 2016
http://www.thestudentroom.co.uk/showthread.php?t=3510005
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Azurite
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I hope everyone got what they wanted at Results Day!

So, reply to this thread if you're doing A2 Biology!
Also, do you feel like you're ready for A2 Biology.. are you doing anything to prepare for Unit 4? Homework?
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Azurite
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It's nearly time to go back to college :P
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edward090
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(Original post by Azurite)
It's nearly time to go back to college :P
Is this thread dead because I kinda need help with biology and want a active thread
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She-Ra
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(Original post by edward090)
Is this thread dead because I kinda need help with biology and want a active thread
It will become busier as we get closer to exam season - don't worry
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edward090
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(Original post by She-Ra)
It will become busier as we get closer to exam season - don't worry
do you do Biology A2 AQA?
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thatgr
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reporting in
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turtle294
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So I have currently moved onto to unit 5, and we are covering the top of eyes. I really need help with this exam question:


'suggest an explanation for the difference in sensitivity of rod cells to the white and green spots after 30 minutes'

I'm so confused and the answer: 'white has (high proportion of) wavelengths to which rhodopsin not sensitive' makes no sense whatsoever. Any help would be much appreciated thank you in advance!!!
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thatgr
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(Original post by turtle294)
So I have currently moved onto to unit 5, and we are covering the top of eyes. I really need help with this exam question:


'suggest an explanation for the difference in sensitivity of rod cells to the white and green spots after 30 minutes'

I'm so confused and the answer: 'white has (high proportion of) wavelengths to which rhodopsin not sensitive' makes no sense whatsoever. Any help would be much appreciated thank you in advance!!!
Rhodopsin is found in rod cells, it breaks apart in the presence of wavelengths of light, this creates an action potential. I imagine as white is every visual wavelength combined the eye doesn't need most of it as it only detects RGB (i think). It detects Green as it's part of the spectrum the cone and rod cells detect i guess
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edward090
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(Original post by thatgr)
Rhodopsin is found in rod cells, it breaks apart in the presence of wavelengths of light, this creates an action potential. I imagine as white is every visual wavelength combined the eye doesn't need most of it as it only detects RGB (i think). It detects Green as it's part of the spectrum the cone and rod cells detect i guess
unit 5 just looks soooo hard :/ we are doing a practice empa for reasons I do not know fml....
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koolgurl14
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damn people already moved on to unit 5 :O we only started respiration at our college lol this is freaking me out
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PlayerBB
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Is there a thread for edexcel unit 4 A2 biology?

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edward090
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(Original post by PlayerBB)
Is there a thread for edexcel unit 4 A2 biology?

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I believe this thread is for both unit 4 and unit 5.
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edward090
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(Original post by koolgurl14)
damn people already moved on to unit 5 :O we only started respiration at our college lol this is freaking me out
we just finished respiration and now we are doing a practice empa so god knows how long that will take. dreading unit 5 :/
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thatgr
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(Original post by edward090)
we just finished respiration and now we are doing a practice empa so god knows how long that will take. dreading unit 5 :/
Unit 5 is easier for me, I like just learning facts etc.
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turtle294
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(Original post by thatgr)
Rhodopsin is found in rod cells, it breaks apart in the presence of wavelengths of light, this creates an action potential. I imagine as white is every visual wavelength combined the eye doesn't need most of it as it only detects RGB (i think). It detects Green as it's part of the spectrum the cone and rod cells detect i guess
Thank you so much!
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edward090
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What grades are people aiming for at the end of A2???
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thatgr
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(Original post by edward090)
What grades are people aiming for at the end of A2???
Probably a B, I ****ed up AS hard and I need 270UMS for an A/A* but I'm not that bothered as I only need AAB for the courses I want to do at uni
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preetg97
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http://www.thestudentroom.co.uk/show...ology+2016+aqa

My A2 notes for anyone needing them.
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Rubato
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I'm doing A2 (: Having trouble with unit 5 though, I find it so boring and hard - I much prefer unit 4's content.
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