The Grana and Stroma are the parts of which cell organellesA. MitochondriaB. ChloroplastC. RibosomeD. Golgi bodies

The correct answer is B) Chloroplast.
Grana and Stroma are the two main components of the chloroplast, which is the organelle responsible for photosynthesis in plant cells and some algae.
1. Grana:
o Grana (singular: granum) are stacks of thylakoid membranes found inside the chloroplasts.
o The thylakoid membranes contain chlorophyll, the pigment that captures light energy during the light-dependent reactions of photosynthesis.
o Grana are responsible for converting light energy into chemical energy, which is stored as ATP and NADPH.
2. Stroma:
o The stroma is the fluid-filled space surrounding the grana inside the chloroplast.
o It contains enzymes that facilitate the Calvin cycle (light-independent reactions), where the energy from ATP and NADPH is used to convert carbon dioxide into glucose.
Why Other Options Are Incorrect:
• A. Mitochondria: Mitochondria are involved in energy production (cellular respiration) and contain inner membranes and matrix, but they do not have grana and stroma.
• C. Ribosome: Ribosomes are responsible for protein synthesis but do not contain grana or stroma.
• D. Golgi bodies: The Golgi apparatus is involved in modifying, sorting, and packaging proteins but does not contain grana or stroma.
Thus, grana and stroma are parts of the chloroplast, making B) Chloroplast the correct answer.