Which of the following statements is incorrect?

  • A
    Each granum contains $2$ to $100$ thylakoids.
  • B
    The inner membrane of the chloroplast forms the endomembrane system.
  • C
    The stroma of mitochondria and chloroplasts contains ribosomes and circular $DNA$.
  • D
    Photophosphorylation and dark reactions occur in the chloroplast.

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