Plants need both sulfur and phosphorus in order to grow and reproduce. how do plants obtain sulfur and phosphorus? a) plants take in compounds of sulfur and phosphorus through the stomata. b) plants absorb sulfates and phosphates present in the soil through their roots. c) plants get sulfur and phosphorus through the insecticides sprayed on the leaves. d) plants absorb sulfur and phosphorus from rain droplets that accumulate on leaves.