Plants growing in soil lacking magnesium ions have poor growth.
What causes their poor growth?
They cannot form cellulose for new cell walls.
They cannot form chlorophyll for photosynthesis.
They cannot produce amino acids to form proteins.
They cannot take in mineral ions from the soil.
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1 markWhich row of the table below shows the correct effects of deficiencies of essential minerals for plant growth?
| effect of magnesium ion deficiency | effect of nitrate ion deficiency | |
| A | yellow leaves | stunted growth |
| B | stunted growth | long roots |
| C | small leaves | yellow leaves |
| D | stunted growth | yellow leaves |
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A student grows young plants in four different test tubes.
Tube W contains all the mineral ions needed for healthy plant growth.
The diagram shows the appearance of the plants after two weeks.
What do tubes X, Y and Z contain?
| X | Y | Z | |
| A | all minerals except magnesium ions |
all minerals except nitrate ions |
water only |
| B | all minerals except magnesium ions |
water only | all minerals except nitrate ions |
| C | all minerals except nitrate ions |
all minerals except magnesium ions |
water only |
| D | water only | all minerals except magnesium ions |
all minerals except nitrate ions |
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