1 The graph below shows the solute concentration inside a paramecium over time What is happening at the time indicated by the pointer?
Concentration (%)
3
2.5
2
$
1.5
1
0.5
Time (s)
O
10
50
60
20 30 40
Water solute concentration
Paramecium solute concentration
O A Water is moving rapidly into the paramecium by osmosis
B Water is moving rapidly out of the paramecium as the contractile vacuole contracts.
C The paramecium is having a meal.
Solutes from the surrounding water are diffusing through the cell membrane, causing the solute concentration inside the paramecium to nse