Describe the cell organelle which contains chlorophyll pigments.

* Chloroplasts are double membrane bounded organelles.
* A number of organized flattened membranous sacs called thylakoids are present in stroma.
* Thylakoids are arranged in stacks like the piles of coins called grana.
* Stroma lamellae connect the thylakoids of different grana.
* Photosynthetic pigments are present in the thylakoid.
* The stroma contains enzymes required for photosynthesis, circular DNA and 70S ribosomes.