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[Unofficial Markscheme] OCR A Level Biology Biological processes H420/01 - 9 Jun 2022

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Original post by lunariumxo
that suckss i literally had put that down and crossed it out :frown:

I think its paired t-test because you had the same group put in different conditions (light and dark)
Original post by flaurie
Hi everyone! Hope you all found the exam okay :heart:
You can contribute to the unofficial markscheme by posting some answers here (try and include the question numbers too if you can remember), and I'll compile them into a markscheme on this post :yy:

There's a chat thread about the exam here: https://www.thestudentroom.co.uk/showthread.php?t=7183627




have you made the markscheme yet
Original post by BadBComeToTheNiz
How did you guys work out Q10?


no idea i guessed
photosynthesis qs- envolope =f. Stroma apeared twice, and lamelle was the bands beetween the granum.
gap fill- rubp, gp, nadph and atp and starch
Original post by AquaK
What did everyone write for the 6 marker on ATP supply?


I wrote about aerobic respiration, anaerobic respiration and about creatine phosphate.
photythsis- sroma twice, lamele bands next to darkness, envlope=f. rupb, gp,nadph and atp and starch
Original post by joannar_
I wrote about aerobic respiration, anaerobic respiration and about creatine phosphate.


just anerobic and atp pc- becuase walking and jogging at (LOW INTENSITY)is not vigorous exersise!!!!!!!!!!!!!!!!!- its got to be just anaerobic systems because they state (high intensity- short and long duration.) I also do pe a level so I know this is correct!!!
(edited 1 year ago)
Reply 67
Avatar for ypeach
ypeach
1
Original post by 665Albertros
just anerobic and atp pc- becuase walking and jogging at (LOW INTENSITY)is not vigorous exersise!!!!!!!!!!!!!!!!!- its got to be just anaerobic systems because they state (high intensity- short and long duration.) I also do pe a level so I know this is correct!!!


bruh i lost brain cells reading this, are u agreeing or disagreeing with him cos i wrote abt the exact same thing, i talked abt creatine phosphate and glycolysis and the other few aerobic respiratory processes that produced atp, i cant imagine that being wrong
Original post by 665Albertros
photosynthesis qs- envolope =f. Stroma apeared twice, and lamelle was the bands beetween the granum.
gap fill- rubp, gp, nadph and atp and starch

I personally think it was sucrose and not starch. After a lot of reading online after the exam, a lot of websites stated it is sucrose which travels through the plasmodesmata and into the phloem. I don't know about relative sizes and what can actually pass through the plasmodesmata, but I think starch is too big to pass through it and into the phloem sap. but not 100% sure, i could be wrong
Original post by patelheet30
I personally think it was sucrose and not starch. After a lot of reading online after the exam, a lot of websites stated it is sucrose which travels through the plasmodesmata and into the phloem. I don't know about relative sizes and what can actually pass through the plasmodesmata, but I think starch is too big to pass through it and into the phloem sap. but not 100% sure, i could be wrong


yh personally i put assimilates or sucrose cant remember which one but technically assimilates includes sucrose so both should be right.
Reply 70
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Yigeee
7
Hi guys, for the leaf diagram question 1, was that phloem or xylem? Cuz I thought it point the inside one?
Original post by Yigeee
Hi guys, for the leaf diagram question 1, was that phloem or xylem? Cuz I thought it point the inside one?


A lot of people are saying Cambium, I put Phloem myself cuz I totally forgot about the Cambium
Original post by 665Albertros
just anerobic and atp pc- becuase walking and jogging at (LOW INTENSITY)is not vigorous exersise!!!!!!!!!!!!!!!!!- its got to be just anaerobic systems because they state (high intensity- short and long duration.) I also do pe a level so I know this is correct!!!

Frrr everyone is saying they put aerobic but I only put anaerobic and creatinine phosphate too😭
yesss i also put about transparency to allow aquatic plants to receive enough light for photosynthesis
Original post by treasuremaker
yh personally i put assimilates or sucrose cant remember which one but technically assimilates includes sucrose so both should be right.


yay i put sucrose too
(Original post by patelheet30)I personally think it was sucrose and not starch. After a lot of reading online after the exam, a lot of websites stated it is sucrose which travels through the plasmodesmata and into the phloem. I don't know about relative sizes and what can actually pass through the plasmodesmata, but I think starch is too big to pass through it and into the phloem sap. but not 100% sure, i could be wrong

Original post by Anonymous9608
Frrr everyone is saying they put aerobic but I only put anaerobic and creatinine phosphate too😭
Original post by 665Albertros
just anerobic and atp pc- becuase walking and jogging at (LOW INTENSITY)is not vigorous exersise!!!!!!!!!!!!!!!!!- its got to be just anaerobic systems because they state (high intensity- short and long duration.) I also do pe a level so I know this is correct!!!

6 marks for just anaerobic and create phosphate seems unlikely tbh. It was describe different sources, describing 2 sources doesn't seem worth 6 marks (more like 4), describing 3 sources would be worth 6 marks, hence aerobic would be necessary to include.
6 marks can come from glycolysis, lactate fermentation and atp pc system- talking about the effects of lactate and denaturing of enzymes- how many atp popular produces and the intensity of exercise. Why on earth would they put vigorous exercise. Do you think walking is vigorous exercise . Every person who wrote aerobic exercise must just sit on their phone all day and when they get up for a walk thing this is vigorous exercise!!
Original post by Spectrz
6 marks for just anaerobic and create phosphate seems unlikely tbh. It was describe different sources, describing 2 sources doesn't seem worth 6 marks (more like 4), describing 3 sources would be worth 6 marks, hence aerobic would be necessary to include.
Original post by 665Albertros
6 marks can come from glycolysis, lactate fermentation and atp pc system- talking about the effects of lactate and denaturing of enzymes- how many atp popular produces and the intensity of exercise. Why on earth would they put vigorous exercise. Do you think walking is vigorous exercise . Every person who wrote aerobic exercise must just sit on their phone all day and when they get up for a walk thing this is vigorous exercise!!


I have just checked the text book and it ses that the majority of atp is made via anerobic and atp pc and that pc - is used during their words “ vigorous exercise “
Original post by 665Albertros
I have just checked the text book and it ses that the majority of atp is made via anerobic and atp pc and that pc - is used during their words “ vigorous exercise “

Key word being 'majority' so there must be other sources. It said outline the sources of ATP during strenuous exercise so there will have been aerobic initially

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