Ocr biology multiple choice questions
could anyone explain the first multiple choice question please
https://pmt.physicsandmathstutor.com/download/Biology/A-level/Topic-Qs/OCR-A/3-Exchange-and-Transport/Set-C/3.1%20Exchange%20Surfaces%20MCQ%20QP.pdf its abt blood and water and countercurrent system and question 13
https://pmt.physicsandmathstutor.com/download/Biology/A-level/Topic-Qs/OCR-A/3-Exchange-and-Transport/Set-C/3.1%20Exchange%20Surfaces%20MCQ%20QP.pdf its abt blood and water and countercurrent system and question 13
(edited 2 months ago)
Reply 1
Original post by koketenshi
could anyone explain the first multiple choice question please
https://pmt.physicsandmathstutor.com/download/Biology/A-level/Topic-Qs/OCR-A/3-Exchange-and-Transport/Set-C/3.1%20Exchange%20Surfaces%20MCQ%20QP.pdf its abt blood and water and countercurrent system and question 13
https://pmt.physicsandmathstutor.com/download/Biology/A-level/Topic-Qs/OCR-A/3-Exchange-and-Transport/Set-C/3.1%20Exchange%20Surfaces%20MCQ%20QP.pdf its abt blood and water and countercurrent system and question 13
pretty sure the answer is b
it shows water and blood flowing in opposite directions and a constant gradient for oxygen diffusion.
Reply 2
5
Original post by brittj06
pretty sure the answer is b
it shows water and blood flowing in opposite directions and a constant gradient for oxygen diffusion.
it shows water and blood flowing in opposite directions and a constant gradient for oxygen diffusion.
is d not the same tho
Reply 3
Original post by koketenshi
is d not the same tho
its bcs you need to look at the mechanism of counter current exchange. Water and blood flow in opposite directions.
So that maintains a diffusion gradient along the gill plate.
•
Oxygen always moves from water (higher O2%) to blood (lower O2%).
•
This allows maximum oxygen absorption
I think that's it anyways i could be wrong lowk
Reply 4
5
ah ur right i understand it now thanks
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