A plant cell needs to make food out of chloroplasts using energy from the sun to get its food, while the animal cell eats food and creates energy, which is the reason why animal cells do not need chloroplasts.
Both animal and plant cells have mitochondria, but only plant cells have chloroplasts. Plants don't get their sugar from eating food, so they need to make sugar from sunlight. Because animals get sugar from the food they eat, they do not need chloroplasts: just mitochondria.
