The stack of thylakoids inside a chloroplast is called:
AA stroma
BA lumen
CA matrix
DA granum
Answer & Solution
Correct answer: D. A granum
1. A chloroplast holds flattened membrane sacs called thylakoids.
2. These sacs are arranged in stacks.
3. Each stack of thylakoids is called a granum.
4. The stroma is the fluid around the grana, not the stack itself.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 4 'Cell Structure', sections 4.1-4.6_
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