The granum and stroma lamellae are the parts of A) Mitochondria B) Chloroplast C) Ribosomes D) Golgi bodies

The granum and stroma lamellae are parts of B) Chloroplast.

Explanation:
Chloroplast Structure: Chloroplasts are organelles found in plant cells and some algae, responsible for photosynthesis. They have a double membrane structure.

Granum:

A granum (plural: grana) is a stack of thylakoids, which are membrane-bound compartments where the light-dependent reactions of photosynthesis occur. The thylakoids contain chlorophyll and other pigments that capture light energy.
Stroma Lamellae:

Stroma lamellae are the interconnecting membranes between the grana. They help in connecting different grana and also provide a site for certain reactions of photosynthesis.
Function in Photosynthesis:

The arrangement of grana and stroma lamellae maximizes the surface area for light absorption and facilitates the efficient transfer of energy and molecules needed for photosynthesis.
In conclusion, both granum and stroma lamellae are essential components of chloroplasts, playing critical roles in the process of photosynthesis.