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publish date: 2026/06/15 06:28:30.907328 UTC
Plastids have an internal structure consisting of membranes (lamellae) and a surrounding protein-rich fluid.
The proteinaceous matrix inside plastids is known as the (1).
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thylakoids
stroma
amyloplasts
grana
Correct Answer
(1) stroma
Explanation
The stroma is the proteinaceous (protein-rich) matrix inside plastids such as chloroplasts. It surrounds the grana (stacks of lamellae) and is the site of the Calvin cycle reactions of photosynthesis, where carbon dioxide is fixed into sugars.
Reference
Biology: A Self-Teaching Guide