(a(i))[2]
Describe what happened in test-tubes 1 and 2.
(a(ii))[1]
Calculate how much the mass of the potato cylinder in test-tube 3 decreased.
(a(iii))[2]
Explain why the potato cylinder in test-tube 3 lost mass.
(b)[2]
State one mineral ion and explain why it matters for plant growth.