The table provided shows the concentration of sodium and iodine in sea water and cell sap of a plant.
(a) (i) Name the process through which the plant
cell take up sodium ions.
(ii) Give a reason for your answer in (a) (i) above.
(b) If the plant was sprayed with a chemical that inhibit respiration.
(i) Which of the two ions uptake will be affected?
(ii) Give a reason for your answer in (b) (i) above.
Answer:
a)i)
-Diffusion.
ii)
- Ions diffuse from highly concentrated region to lowly concentrated region OR ions diffuse along concentration gradient because sea water contain high concentration of sodium than cell sap.
b)i)
- Iodide ions
ii)
Iodine ions are taken up by active transport i.e against concentration gradient and this process requires energy delivered from respiration i.e
sea water has lower concentration of iodide ions.
-Diffusion.
ii)
- Ions diffuse from highly concentrated region to lowly concentrated region OR ions diffuse along concentration gradient because sea water contain high concentration of sodium than cell sap.
b)i)
- Iodide ions
ii)
Iodine ions are taken up by active transport i.e against concentration gradient and this process requires energy delivered from respiration i.e
sea water has lower concentration of iodide ions.
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Explain what would happen to red blood cells if they are placed in a concentrated salt solution. 
