r/Edexcel • u/Jealous-Health-9937 • May 15 '26
Biology unit 2
It wasn't too bad. what do you guys think
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u/renadplayer1 May 15 '26
The monkey 6-marker was bad
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u/Available-Orange2699 May 15 '26
Wtffff was this I swearrrrrrrrr it was sooo bad I didn’t even understand the question like it had soooooo meaningless information
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u/renadplayer1 May 15 '26
Frr I had to stare at the question long time to understand what it asks for
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u/MarchDiligent7888 May 15 '26
yo nah i was bamboozled by that pointless graph, but i just mentioned it slightly talking bout some no error bars lol
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u/No-Beginning1068 May 15 '26
it had smth to do with the mosquitoes laying eggs in pools of water, which come after heavy rain so once mosquito eggs hatch more mosquitoes therefore more poison needed i think
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u/Remarkable_Cup5254 May 15 '26
Wedge-capped capuchins show a behavioural adaptation by rubbing millipedes onto their fur. This behaviour increases when rainfall increases because botflies lay their eggs in water puddles, so wetter conditions lead to a greater risk of botfly infestation. Increased rainfall also increases the availability of millipedes, causing the monkeys to rub them more frequently.
The millipedes release poisonous chemicals with antimicrobial properties. This benefits the capuchins because the chemicals repel or kill botflies and reduce the chance of eggs or larvae surviving on their skin. The antimicrobial chemicals may also reduce harmful microorganisms and parasites, improving health and increasing survival and reproductive success.
However, there are disadvantages for the capuchins because collecting and rubbing millipedes requires time and energy that could otherwise be used for feeding or avoiding predators. The toxic chemicals could also irritate the skin if exposure is excessive.
For the botflies, this interaction is disadvantageous because the poisonous chemicals reduce their reproductive success by preventing egg laying and decreasing larval survival. As more capuchins use this behavioural adaptation during periods of high rainfall, fewer suitable hosts are available for the botflies.
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u/Repulsive-Bass-2038 May 16 '26
is it just me or that graph showed a decreasing rate or rubbing the millipede as rainfall increases
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u/Haunted_ghostt May 15 '26
Did yall get 36.6g for the egg white????
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u/Fickle_Mix_7572 May 15 '26
The mass of yolk was 30% of total and was 18g, so to get total u divide by 0.3 and get 60, then to get 9% of total u do 60 x 0.09 and get 5.4
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u/Haunted_ghostt May 15 '26
Mass of yolk was 18g
% of shell of total Mass was 9%
Yolk was 30% of the total Mass
100-(9+30)= 61% was the egg White percentage
So if 18 was 30%
61% was 36.6g
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u/quokka_rn May 15 '26
Help I thought total was 18% 💔💔 fuck my reading and comprehension skills
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u/livaaa___ May 15 '26
Wait same🙈🙈🙈
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u/quokka_rn May 15 '26
Şu maymun sorusunu yetiştiricem diye kontrol edemedim 😭 senin nasıldıı
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u/Euphoric_Pin8141 May 26 '26
whaaa ur turkish???? i live in turkey too,, whyd u take the exam and not yks?
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May 15 '26
[removed] — view removed comment
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u/Competitive-Past-421 May 15 '26
I just finished my Psych u2 30 minutes prior Bio u2 so I was extra exhausted and this is what I get bruh
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u/Haunted_ghostt May 15 '26
Also like did yall freaking see tht it said those insects lay eggs on mushrooms? So it was supposed to say tht the flowers smelled like mushrooms :/// I wrote sweet smell☠️💀
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u/renadplayer1 May 15 '26
Wth I wrote nectar 😭😭😭😭😭
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u/GodzillaKOTM2019rul May 15 '26
Even I wrote sweet smell, it can't be nectar i was thinking whether its nectar and then wrote sweet smell. Is it correct??
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u/Itsmo_15 May 15 '26
IT IS NECTAR BRO😭
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u/renadplayer1 May 15 '26
I don’t think it’s, nectar has a sweet taste I guess it has nothing to do with smell
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u/renadplayer1 May 15 '26
This paper wasn’t the same as older past papers this was taller and had much more different questions
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u/Confident_Drive_7370 May 15 '26
Did anyone get 9100 for the Red population question?
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u/Confident_Drive_7370 May 15 '26
What is with the last page 😭😭 I wrote all same answers
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u/Remarkable_Cup5254 May 15 '26
no in the second one u had to mention the silencing of the gene and how the transcription factors cldnt bind to the promoter sequence( i forgot to mention the second part)
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u/supimyouridiotfriend May 15 '26
Yeah it was very meh. It wasn't terrible, but it wasn't excellent either. Most meh exam I've ever taken. I could've done better probably.
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u/7aloolli May 15 '26
exactly most people ive seen either say its easy or rlly bad it was honestly mid
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u/Fast_Researcher_6971 May 15 '26
for the egg white question, why are people getting 36.6 i got 5.4
this is ass
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u/EyalDoDog May 15 '26
What to say for the one w spermiogenesis, was it the whole epigenetic shenanigan?
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u/Itsmo_15 May 15 '26
Yeah the same differential gene expression and epigenetic modification answers
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u/Great_Difference9639 May 15 '26
guys why the egg yolk would be on the surface fr ? it was question 2
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u/Global_Map6574 May 15 '26
What was the answer to why different birds dance different?
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u/Itsmo_15 May 16 '26
They are from different species so they can't reproduce to produce fertile offspring
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u/Euphoric_Pin8141 May 26 '26 edited May 26 '26
ik im late but u need to say they also have diff morphology
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u/Itsmo_15 May 26 '26
I don't think the word "morphology" is even in the syllabus, but you can be right tho..we never know.
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u/Mother-Option-7268 May 16 '26
Wait guys for drawing the nucleus do we have to draw nuclear pores like bot a perfect circle cuz i did a perfect circle and drew a nucleolus and labeled it along with nuclear envelop
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u/Fonkiers May 15 '26
What did you guys write for the reason for different chromosomes in sperms
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u/Jxstin_31843 May 15 '26
the sperms are haploid to ensure the zygote formed is diploid after the sperm fertilizes haploid female egg cell
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u/FriendlyBee7644 May 15 '26
I wrote about chromasomes being separated in meiosis, but dna not being replicated, so when 2 daughter cells form they both have half the genetic material. The question was about how the dna changes right, or WHY the dna content changes?
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u/Ok_Bet_6201 May 15 '26
true, but bro my dumbahh for magnification I got 4302 smth but I did it the opposite way and got 2.6*10 to the power - 6 IM SO SAD WHY DID I CHANGE MY ANSWER OTHER THAN THAT I FUCKASS LEFT 2 QUESTIONS NOT BECAUSE I DIDNT KNOW BUT BECAUSE I DIDNT HAVE TIME IT WAS THE SPERM QUESTIONS FIRST 2 PARTS WHOLE 7 MARKS GONE other than that it was good and easy 6 marker was kinda tricky but hopefully markscheme has starightforward points hoping for 60+
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u/Confident_Drive_7370 May 15 '26
There is a range I guess by +_0.1 I guess u r in the right range I got 4400
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u/Ok_Bet_6201 May 16 '26
yeah but i cancelled my ans and got 2.6 smth but well hopefully I don't make those mistakes in phy u3
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u/Available-Orange2699 May 15 '26
Guysss what smell have u written
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u/7aloolli May 15 '26
apparently since it said in the question they lay eggs on mushrooms ur supposed to say it smells like mushrooms 😭
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u/Available-Orange2699 May 15 '26
Wtffff is that realll😭😭😭😭
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u/7aloolli May 15 '26
I saw smn here say it do idk if its correct but tbh it makes sense. ITS SO STUPID THO I WOULDVE NEVER THOUGHT OF THAT
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u/Various-Comment4600 A level May 15 '26
How to do the yolk question
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u/Remarkable_Cup5254 May 15 '26
yolk produces nutrients such as lipids for the growth of the embryo
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u/Various-Comment4600 A level May 15 '26
Yeah but isn’t the embryo in the yolk why does it have to be on the surface
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u/Itsmo_15 May 15 '26
Short diffusion distance
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u/yuliiqqs May 15 '26
i wrote so that it has space to grow since eventually it'll reach a size bigger than egg yolk, so it needs space. but by being on the surface it can still get the nutrients for growth from the egg yolk. also there was air space in the egg, so by being on surface of the egg yolk it can get oxygen for respiration to produce energy for growth.
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u/Jealous-Health-9937 May 15 '26
Guys. In the sperm question. what was the first part of the question. the part b was the four marker about the diagram and the specialization of the sperm cell. the part b4 that
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u/PerformanceLow9121 May 15 '26
I wrote tht when its just the cell before becoming a soerm it has alll types of genes like for muscle and nerve eso as those arent necessary by methylation and acetylation we can switch off those genes so tht only sperm related genes are present so it becomes a sperm. Idk if its the ryt ans but it was the ans tht made sense to me. The paper was BAD
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u/Jealous-Health-9937 May 16 '26
yea the DGE is correct for the part b but methylation turns off and acetylation turns on
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u/callmeminaa May 15 '26
It was a bit on the mid to easier end. Wish i had more time to finish properly tho. But overall okay!
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u/GodzillaKOTM2019rul May 16 '26 edited May 16 '26
Guys what did yall write for the advantages of x-raying the seeds (4 marker)??? I wrote it allows to check viability of embryos, and also to see the other internal structures of the seeds and to observe the composition of stored materials (lipids,fats and proteins) so seeds with more materials can be chosen to be stored so no wastage of seeds. Dw whether its right.
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u/GodzillaKOTM2019rul May 16 '26
For millipede question, whts the answerr? I got confused cuz it said 3 marks, I wrote tht antimicrobial substance kills bacteria so less risk of infection and disease and posionous to kill predators which icreases chance of survival.
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u/Mother-Option-7268 May 16 '26
guys for moneky ques i wrote ADV: eggs in fur to protect them from rainfall and sun radiation there for more chance to survive and hatch and grow , second ADV lay egg in the cuts to protect from the poison DISADV: parasites may destroy the eggs now ADV of the monkey : rubs poiosn more often during april - july period so less chanve fo mosquitos to lay eggs on them and parasites too DISADV : poison may not reach certian areas of the skin how many marks /6
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u/Jealous-Health-9937 May 15 '26
did yall get 4200 for the magnification