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1 Plants take up inorganic ions from the soil.
These ions include calcium, phosphate and potassium.
(a) (i) Name the molecule that contains calcium ions in the cell walls of a plant.
(1)
(ii) How many of the following statements are correct?
(1)
• phosphate ions are used to make DNA and RNA
• phosphate ions are used in the structure of the cell membrane
• the element potassium is part of a peptide bond
A none
B one only
C two only
D three
(b) The uptake of potassium ions by plant seedlings in anaerobic and aerobic
conditions was investigated.
The seedlings were grown in a mineral ion solution containing a low
concentration of potassium ions for 30 hours. The conditions were anaerobic for
the first 15 hours and aerobic for the second 15 hours.
2
*P71909A0232*
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