Biology 0610 · IGCSE · Osmosis

Osmosis — practice question

A student studied how placing cylinders made from potato tissue into sucrose solutions of different concentrations affected them. The mass of each potato cylinder was recorded before immersion and again after it had been left in the solution for 60 minutes. Table 5.1 presents the findings.
(a(i))[3]

Several conclusions about the results in Table 5.1 have been written by the student. Tick (✓) every conclusion that is correct. • The potato cylinder in 0.10 mol per dm$^3$ sucrose solution had the greatest percentage change in mass. • The drop in mass in 1.00 mol per dm$^3$ sucrose solution is due to water leaving the potato cylinder. • 0.75 mol per dm$^3$ sucrose solution has the same concentration as the potato cylinder. • The change in potato cylinder mass is caused by water moving across the potato cell membranes. • The potato cylinder placed in 0.25 mol per dm$^3$ sucrose solution loses mass. • As sucrose solution concentration increases, the potato cylinder gains more mass.

(a(ii))[1]

State the name of the process responsible for the results shown in Table 5.1.

(a(iii))[2]

State two factors, other than concentration, that would affect the rate of mass change shown in Table 5.1.

(b)[1]

State the name of the part of the cell that stops plant cells from bursting when they are placed in distilled water.

(c(i))[2]

Circle two uses of water in the body. as an enzyme as genetic material as a solvent for phagocytosis for transport

(c(ii))[2]

State two other components of a balanced diet.

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: The greatest percentage change in mass occurs at 0.10 mol dm-3

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