Which best describes two ways in which hydrogen is involved in photosynthesis? a) 1 - hydrogen is stored in leaves of plants. 2 - hydrogen combines with carbon dioxide to make glucose. b)1 - hydrogen is stored in leaves of plants. 2 - hydrogen combines with oxygen to make water. c)1 - hydrogen enters plants as a component of water. 2 - hydrogen combines with carbon dioxide to make glucose. d)1 - hydrogen enters plants as a component of water. 2 - hydrogen combines with oxygen to make carbon dioxide.