Biology · May / June 2019 · Paper 21 · Question 1
5090
As printed in the paper
The question as text
A seal is a mammal that spends most of its time in the sea. It breathes and respires in a very similar way to a human, but when it dives to hunt and catch fish, it is capable of staying under water for up to 20 minutes. The graph shows the percentage concentrations of oxygen and carbon dioxide, and the concentration of lactic acid in a seal’s blood over a 40 minute period during which it dives to hunt and catch fish. percentage concentration of blood gases concentration of lactic acid / mmol per dm3 time / minutes 0 0 20 40 60 80 0 5 10 15 20 10 20 30 40 lactic acid carbon dioxide oxygen lactic acid carbon dioxide oxygen
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
1(a)[2]
1(b)(i)[1]
1(b)(ii)[1]
1(c)[3]
1(d)[3]
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.