Detailed discussion of IGCSE Biology Edexcel paper 1.

Let's see what everyone wroteo for what's present in plant but not animal cells: vacuole, chloroplasts & cell wall

I completely failed the labelling the neurone diagram. They gave you sensory. I wrote receptor first, second was sensory, then I wrote CNS for the third and response muscle last, LOL.

I wrote for the fish and meat graph that fish and meat production both increased (then I said by how much) but I said meat production had fluctuations e.g. Increased then dropped between 2010-2012.

I think for suggest why co2 levels dropped I said because countries introduced carbon credit to reduce the co2, industries are being more sustainable and trees are being planted (lol).

Then for the natural selection I said the white snails had a selective advantage so there was a selective pressure to breed with them so that the offspring get the best alleles. I also said that eventually the snail population will be mainly white.

For the 6 marker I said get 6 eggs, place them all in the same amount of solution. Place egg1 at 0 degrees, egg 2 at 20, egg 3 at 40 etc until 100 degrees. Then wait 3 days and see the best one.

For the eye labels: iris, pupil

Eye roles: optic nerve, cornea and sclera

For the which parent determines the baby gender: male because the baby will either inherit the Y chromosome or not

For the vagina label: I put vagina wall, ligament, ovaries and uterus lining

For the how does meiosis differ from mitosis: meiosis produces 4 cells, divides twice, one chromosome ends up in each daughter cell for variation, and sex cells are produced

For the calculation at the beginning: 0.9/120 = 0.0075

I wrote sulphur oxide not sulphur dioxide -.- I'm dumb

For why it's good to reduce greenhouse gases:-global temp won't rise
-polar ice caps less melting
-less rise of sea level
-less changes need to be made to agricultural practices
-warm water won't be redirected to previously cooler areas
-rainfall patterns won't change

Anything else?? xxx

hey what neurone diagram are you reffering to was there a question aasking you to label a neurone and how many marks was it

One at the beginning and it was 4 marks x

i wrote stimulus
sensory neurone
relay neurone
motor meurone
effector
that is correct right

Is response instead of effector ok?

What did you put for the 4th last question, on why natural contraception is unreliable?