Chloroplasts are the food producers of the cell. The organelles are only found in plant cells and some protists such as algae. Animal cells do not have chloroplasts. Chloroplasts work to convert light energy of the Sun into sugars that can be used by cells.
They can be observed in a microscope because both of them are very small to see. Mostly, they contain genetic material. Viruses need a host to keep it spreading or etc.
