Question

A granum is made up of:

• A. Stacks of membrane-bounded, flattened discoid sacs called thylakoids containing the molecules of chlorophyll.
• B. A coin-shaped stack of thylakoids, membrane-like structures in the chloroplasts of plant cells. Grana are separately present to form stromal thylakoids.
• C. Many thylakoids arranged one beside the other
• D. None of the above

Answer 1

Answer: (A)

Thylakoids are flattened sacs arranged like the stacks of coins. One stack of thylakoids is called a granum. Grana are stacks of membrane-bounded, flattened discoid sacs called thylakoids containing the molecules of chlorophyll. Granum is the site of the light reaction during photosynthesis. They are the main functional units of chloroplasts.