(a(i))[2]
Suggest the sequence of events that leads to the Paramecium moving backwards after it touches an object.
(a(ii))[2]
Suggest how Paramecium maintains a higher concentration of calcium ions in the surrounding water than inside the cell.
(b(i))[1]
Name the process by which water moves into Paramecium.
(b(ii))[1]
Suggest the link between the contractile vacuole’s rate of contraction and the water potential of the surrounding water.
(c)[2]
Describe how Paramecium DNA differs from the DNA of a prokaryotic cell.