Question Constellation Sign up for free AQA · GCSE · Biology · Higher
Mineral Ions and Yellow Leaves
In some leaves, the green parts become yellow because of an ion deficiency.
Which ion is deficient in a plant with yellow leaves?
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Marking points
- 1 Names magnesium/Mg/Mg²⁺ or another ion explicitly allowed by the official scheme.
Full-mark answer
Magnesium ions (Mg²⁺).
Why this answer loses marks
Chlorophyll ions.
Chlorophyll is a pigment, not a mineral ion; name a credited ion linked to yellow leaves.