If you inject the chloroplast into an animal cell then it would not survive because of two reasons: 1. it would be treated as a foreign molecule and will be digested. ... read more
If a chloroplast were injected into a higer animal, it would very quickly be determined as foreign and rejected. However, there are protists that can untilize the products of the chloroplast and do not reject them or "internally eat them. read more
Injeting into an adult animal would probably result in an immune reaction, unless you managed to inject it directly into the cells, and there were no surface proteins identifying that the chloroplast was there. read more