In the context of cellular respiration, the statement that best describes how plants recycle hydrogen is:
The hydrogen in glucose is recycled when water is formed.
During cellular respiration, glucose (C6H12O6) undergoes a series of chemical reactions in the presence of oxygen to produce carbon dioxide (CO2), water (H2O), and energy (ATP). In the process, the hydrogen atoms from glucose are ultimately used to form water, as electrons and protons (hydrogens) are transferred through the electron transport chain, culminating in the reduction of oxygen to form water. This indicates that the hydrogen atoms from glucose are indeed recycled into water during cellular respiration.