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
You might also like to view...
If you were a very thirsty cell, which process would you use to take in some nutrients secreted by one of your neighbors?
A. Phagocytosis B. Pinocytosis C. Receptor-mediated endocytosis D. Exocytosis
Which types of mutations are least likely to be subjected to natural selection?
A. Silent B. Missense C. Nonsense D. Insertion
Of the following types of molecules, which can function as both neurotransmitters and hormones?
A) glucocorticoids B) second messengers C) catecholamines D) adipocytes
In following the hydrologic cycle,
a) CO2 is released in respiration b) H2O is returned to soil via evaporation c) H2O is returned to air via transpiration d) CO2 is fixed in photosynthesis