when an electron is admitted from photosystem to it does not return the photosystem cannot trap any more light energy until the “hole” in the photosystem is filled with another electron the source of the electron that fills the “hole” in photosystem 2 is it carbon dioxide

Answer 1

No, the source of the electron that fills the "hole" in photosystem II is water. During the process of photosynthesis, water molecules are split into oxygen, electrons, and protons. These electrons replace the ones lost when an electron is emitted from photosystem II, allowing photosystem II to continue trapping light energy and contributing to the production of ATP and NADPH in the light-dependent reactions of photosynthesis.