in some unicellular algae, up to 100 in plants like Arabidopsis and wheat.

Chloroplasts are highly dynamic--they circulate and are moved around within cells. Their behavior is strongly influenced by environmental factors like light color and intensity. Chloroplasts cannot be made anew by the plant cell and must be inherited by each daughter cell during cell division, which is thought to be inherited from their ancestor--an ancient photosynthetic cyanobacterium