35. Soil
Soil and Nutrients
Multiple Choice
Multiple ChoiceHow did the addition of a gene for citrate synthesis increase the tolerance of tobacco and papaya plants to high aluminum concentrations in the soil?
A
The citric acid produced by the plant dissolved the aluminum in the soil.
B
The citric acid produced by the plant coated the root tips and blocked the entrance of aluminum.
C
The citric acid produced by the plant degraded the aluminum so that the plants couldn't take it up.
D
All of the listed responses are correct.
E
The citric acid produced by the plants bound the free aluminum in the soil, making it less available to be taken up by the plants.
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