The basic difference between gymnosperm and angiosperm plants (as shown below) ,is the development of _____in the latter. 
Definitions:
Rubisco
Ribulose bisphosphate carboxylase. Carbon-fixing enzyme of the Calvin–Benson cycle.
Electron Transfer Chains
A series of protein complexes and molecular carriers involved in the transfer of electrons through a membrane to generate ATP.
Light-Dependent Reactions
The photosynthesis phase where light energy is converted into chemical energy in the form of ATP and NADPH.
Noncyclic Pathway
A linear process in photosynthesis where electrons move from water to NADPH without cycling back to the original state.
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