Statement I is correct: Mitochondria are described as double membrane-bound structures with an outer and inner membrane . Similarly, chloroplasts are also double membrane-bound organelles (implied by the mention of an inner membrane enclosing the stroma) . Statement II is incorrect: The textbook specifically states regarding chloroplasts that "the inner chloroplast membrane is relatively less permeable" (compared to its outer membrane) . The statement in the question incorrectly frames this characteristic or makes a comparison not supported by the text.