OCR A- Level Biology 2023

Do we have to know how inspiration and expiration happen in bony fish using the operculum and the buccal cavity? that thing is so confusing :frown:

no only inhalation and expiration in humans, the bucal cavity being lowered is too do with gas exchange i think please someone correct me if im wrong

Reply 61

riconasty

6

Original post by siahateskwl

I have the primrose kitten predicted papers if you would like can you please message me since it won't let me link here as the file is too big,

Hi I have managed to link the papers on google drive https://drive.google.com/drive/folders/1nJ2lH6I2QMhacCOLERm-Yu8z4ZEdIRw6?usp=share_link please let me know if it works or not!!1

also Clare biology!!!! has predictions listed on her community page on her YouTube

oh u lovely soul yep they do work thank u so much <3

Reply 62

dyingggg

10

Oh right thanks for your reply, so would you say we have to memorise the thing with buccal cavity being lowered then the water flows in and then the gills because of pressure difference?

Original post by emilia 1234

no only inhalation and expiration in humans, the bucal cavity being lowered is too do with gas exchange i think please someone correct me if im wrong

Reply 63

emilia 1234

6

Original post by dyingggg

Oh right thanks for your reply, so would you say we have to memorise the thing with buccal cavity being lowered then the water flows in and then the gills because of pressure difference?

yes memorise it, basically as water enters the mouth of the fish there is an increase in volume hence the bucal cavity is lowered (there is less pressure now inside) at the same time the oppercular valve is closed. the gills expand. floor of bucal cavity moves up, increasing pressure there so water moves from bucal cavity over gills.

Reply 64

Neymarswho1730

OP

15

I hope fish doesn’t come up

Reply 65

siahateskwl

11

Original post by Neymarswho1730

I hope fish doesn’t come up

feel like it will be module 2 and 5 heavy

Reply 66

luciakenn

1

Original post by username5631166

Does anyone have the as papers for 2022?. I have the a level papers for 2022 if anyone wants to trade

Hey, would really appreciate if you could send paper 3 of the 2020 paper for a level !

Reply 67

dyingggg

10

amazing thank you so much!!

Original post by emilia 1234

yes memorise it, basically as water enters the mouth of the fish there is an increase in volume hence the bucal cavity is lowered (there is less pressure now inside) at the same time the oppercular valve is closed. the gills expand. floor of bucal cavity moves up, increasing pressure there so water moves from bucal cavity over gills.

Reply 68

emilia 1234

6

would photosynthesis come up

Reply 69

sunflowr

9

There is a chance as it's in module 5.

Original post by emilia 1234

would photosynthesis come up

Reply 70

luwatun

13

how did people find it

Reply 71

Iman Al Zaeim

9

Am i the only one on the edge of killing myself coz of it??

Reply 72

Iman Al Zaeim

9

Original post by luwatunji

how did people find it

Not good wby?

Reply 73

Green._.Tea.

4

Original post by luwatunji

how did people find it

found it very mehhh
I'll need to do very good on the second paper to make up for it

OP

I ****ed up on it

OP

Original post by Green._.Tea.

found it very mehhh
I'll need to do very good on the second paper to make up for it

Same

Reply 76

D.Darkrai

9

I thought the paper was solid, the multiple choice questions were excellent, identifying the presynaptic neuron and kidney was also nice. Both the 6 markers were good too. Was it the aorta and pulmonary vein on the left side? Last few pages were a bit dodgy for me, clearly I don’t know plants.

Reply 77

LKS240

1

Yeah, p vein and aorta on the left

Original post by D.Darkrai

I thought the paper was solid, the multiple choice questions were excellent, identifying the presynaptic neuron and kidney was also nice. Both the 6 markers were good too. Was it the aorta and pulmonary vein on the left side? Last few pages were a bit dodgy for me, clearly I don’t know plants.

Reply 78

jxnnyli

2

Original post by luwatunji

how did people find it

pretty good tbh, i think people need to just realise how low the grade boundaries usually are, and even if you didn’t fully get the question, you could get a least 1 mark for even writing something