Plants obtain hydrogen from _________Aatmospheric hydrogenBwater in soilCmethane from fertilizersDH2 from sunlightAnswer: B. water in soil Read Explanation: Plants obtain hydrogen from water in the soil. Hydrogen from sunlight is formed from fusion reactions and is helpful in photosynthesis. Atmospheric hydrogen is inflammable and not helpful for plants. Fertilizers are not preferred as a source for hydrogen as it has many side effects. Water is the best source of hydrogen for plants. Read more in App