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 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.