Edexcel igcse biology

Hi how did everyone find the exam, there were a couple harder questions but in general I reckon I did well. Willing to discuss if anyone wants?

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Reply 1

gonna_fail24

I was wondering what I got for the magnification of ticks one cos I saw sm diff answers? *

Reply 2

Twokslayer256

Original post

by gonna_fail24

I was wondering what I got for the magnification of ticks one cos I saw sm diff answers? *

I heard from a lot of my friends and they put the same as me it was around 29-30 I think

Reply 3

rohxn

it was hard for a bio paper, but it wasn't bad

Reply 4

Twokslayer256

Original post

by rohxn

it was hard for a bio paper, but it wasn't bad

What did you find hard

Reply 5

rohxn

Original post

by Twokslayer256

What did you find hard

what substances the tick absorbed. i put glucose and amino acids, wbu?

Reply 6

Twokslayer256

I don’t think I did well for that I put lipids and proteins

Reply 7

rohxn

Original post

by Twokslayer256

I don’t think I did well for that I put lipids and proteins

ahh. also the greenhouse gases graph, selective breeding Q and the flower reproduction I probably messed up on. mostly the first half of the paper but the second half was okay for me

Reply 8

Twokslayer256

For greenhouse gases I think you had to talk about how carbon dioxide is released via combustion of fossil fuels and then agriculture releases methane and how transport results in nitrous oxides I think

Reply 9

rohxn

Original post

by Twokslayer256

yea i didnt revise any of that 😕 but hopefully the second half makes up for it. have you done any other GCSEs as of yet? I've had geography and both my german writing+listening

Reply 10

gonna_fail24

I was wondering what I got for the magnification of ticks one cos I saw sm diff answers? *

Reply 11

rohxn

Original post

by gonna_fail24

I was wondering what I got for the magnification of ticks one cos I saw sm diff answers? *

don’t really remember sorry

Reply 12

harry_maguire4

Original post

by gonna_fail24

I was wondering what I got for the magnification of ticks one cos I saw sm diff answers? *

Reply 13

Twokslayer256

Original post

by rohxn

yea i didnt revise any of that 😕 but hopefully the second half makes up for it. have you done any other GCSEs as of yet? I've had geography and both my german writing+listening

Yeah I have I’ve done my Spanish speaking and my English language

Reply 14

rohxn

Original post

by Twokslayer256

Yeah I have I’ve done my Spanish speaking and my English language

eng lang already?! I wish 😭

Reply 15

username6837813

My responses and all the questions

I know someone who memorised all the questions. If anyone spots any pontential errors please do give me a shout!

Q1: food web (4 marks; 2MCQs, drawing food chain),

Q2: substances absorbed from the blood by animal what are they and why are they absorbed (4 marks),

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glucose - gain energy

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urea and excretory gasses - removed from human body?

Q3 transfers pathogens why are pathogens transferred to another person by mosquito (2marks)

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blood taken in by mosquito BUT it may take in pathogen/disease causing microorganism

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Pathogen inside blood of mosquito or on it

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Mosquito moves to the second organism, inserts nose, may inject pathogen in blood stream

Q4 calculating magnification correct (2 marks),

that was correct

Q5: effect of changing light intensity on pondweed's rate of photosynthesis,

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increasing light intensity /\ photosynthesis

Q6: fill in the blanks for yoghurt production (7 marks)

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think got 1 wrong label possibly

Q7: respirometer what is the equation for aerobic respiration

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don’t think I got anything wrong

Q8: greenhouse gases, greenhouse gas effect, calculating percentage of emissions by energy production, commenting on results,

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forgot water vapour is green house gas (-1)

Q9: flower, sexual vs asexual reproduction 3 differences, artificial and natural in plants,

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ASEXUAL no genetic variation VS sexual

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ASEXUAL needs no mate VS sexual

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ASEXUAL faster & no need to find mate so more daughter cells

Q10: woman with 4.3 litres of blood calculation (3 marks)

Q11: percentage difference in mass of haemoglobin calculation (WHY MASS HAEMOGGLOBYN INCREASES BUT NUMBER RED BLOOD CELLS DECREASES) (2 marks)

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haemoglobin mass /\ for 2nd highest altitude but decreases 3rd highest this is because person takes heavier/deeper breaths where they get in more O2 so mass haemoglobin decreases

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mass RBC decreases because less o2 to carry

Q12 comment on results (5 marks)

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don’t think I got anything wrong,

Q13 three differences between WBCs and RBCs structure(3 marks)

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RBC have no nucleus

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RBC have a biconcave shape

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RBC has haemoglobin

Q14: cystic fibrosis what happens if it blocks the pancreas and effect on build up in the cervix,

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blocking the sperm so no fusion so decreased successful pregnancy

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for the pancreas it blocks the [pancreas with secretes PROTEASE, LIPASE AND AMYLASE] hence some material TAKES LONGER TO DIGEST and ALSO IT MEANS LESS IS ABSORBED

Q15: different solutions of mineral ions and why might in an experiment they use full concentration and not dilute it with water

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full concentrations ensures that the full effects are visible

q16: designing experiment for the co2 concentration for maximum crop yield

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Use differing amounts of soda lime to very CO2 exposure AND maintain different 5 different plants same weight, species, high, age and put them in dark room for 48 hours to reduce photosynthesis rate to 0 and one of them has no soda lime and different amounts of differing concentrations and ensure same exposure to sun light and water and mineral ions in the soil and the same amount of sunlight access and then you measure the thing and you measure change in height or number of leaves or weight and you repeat multiple time, take average, discount anomalous results