The cytoplasm is all of a cell's contents inside its plasma membrane. In eukaryotes, the cytoplasm only includes what is outside the nucleus. In plants the cytoplasm moves continuously around the periphery of the cell, in a process called "cytoplasmic streaming" this orientates the chloroplasts so that their membranes are perpendicular to the light entering the cell, maximising photosynthetic efficiency.
- Wile, Dr. Jay L. Exploring Creation With Biology. Apologia Educational Ministries, Inc. 1998