Lupins are an angiosperm genus having "cluster roots," which are roots that have high metabolic rates and exude large quantities of organic acids to the soil. What purpose might exuding organic acids serve?

A. It provides energy for free-living soil
microbes.
B. It provides energy for symbiotic microbes.
C. It raises soil pH to liberate tightly bound
minerals.
D. It lowers soil pH to liberate tightly bound
minerals.


D

Biology & Microbiology

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