Here's why:

* Chloroplasts are the organelles responsible for photosynthesis, the process of converting light energy into chemical energy (sugars).

* Plants and algae are photosynthetic organisms, meaning they use sunlight to produce their own food.

* Animal cells and fungi are not photosynthetic. They obtain their energy by consuming other organisms.

It's important to note that while all plants and algae have chloroplasts, some types of algae have different variations of chloroplasts depending on their lineage.