Question
The table below shows the concentrations of sodium and iodine ions in sea water and cell sap of a plant.
(a) (i) Name the process through which plant cells 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 inhibits respiration:
(i) Which of the two ions uptake will be affected?
(ii) Give a reason for your answer in (b) (i) above.
| Sodium ion concentration | Iodine ion concentration | |
|---|---|---|
| Sea Water | 250 | 35 |
| Cell sap | 100 | 550 |
(a) (i) Name the process through which plant cells 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 inhibits 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) The ions are more in the sea water than in the sap ;
(b) (i) Iodine ions ;
(ii) The ions are up taken by active transport /the chemical will inhibit enzymes, hence no active transport occurs.
(ii) The ions are more in the sea water than in the sap ;
(b) (i) Iodine ions ;
(ii) The ions are up taken by active transport /the chemical will inhibit enzymes, hence no active transport occurs.
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