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AQA Biology A2 Unit 4: Populations and Environment - 16th June 2016 watch

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    Hi everyone!

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    AQA Biology A2 Unit 4: Populations and Environment - 16th June 2016.

    BIOL 4 TOPICS:

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

    Section 3 - Energy Flow and Nutrient Cycles
    Spoiler:
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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
    Spoiler:
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    Succession
    Conservation
    Conservation Evidence and Data
    Section 5 - Inheritance, Selection and Speciation
    Spoiler:
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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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    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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    It's nearly time to go back to college :P
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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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    TSR Community Team
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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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    (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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    reporting in
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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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    (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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    (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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    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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    Is there a thread for edexcel unit 4 A2 biology?

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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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    (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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    (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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    (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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    What grades are people aiming for at the end of A2???
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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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    http://www.thestudentroom.co.uk/show...ology+2016+aqa

    My A2 notes for anyone needing them.
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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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