Plastids · Botany

The region between the inner and outer membranes of a plastid is called the:

  1. Chloroplast stroma
  2. Thylakoid lumen
  3. Intermembrane space
  4. Mitochondrial matrix
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Correct answer: Intermembrane space

The intermembrane space is the narrow gap between the two envelope membranes. This double-envelope structure is a key piece of evidence for the endosymbiotic origin of plastids.

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