A plant's stroma is the area where starches, which are types of sugars, are created in the chloroplasts. It is the area where reactions occur.
The plant stroma is a protein-rich fluid that is alkaline, according to TutorVista.com. It is in the inner membrane of the plant, and it is the area that is outside of the thylakoid space. Some of the things that are found in the stroma include starch granules, chloroplast rhisomes, chloroplast DNA and other proteins. This aqueous fluid is found in all plant cells, and it makes up part of the structure of the chloroplast, according to TutorVista.com.