Here's why:

* Chloroplasts are the organelles responsible for photosynthesis. They contain chlorophyll, the green pigment that captures light energy.

* Photosynthesis is the process by which plants convert light energy into chemical energy (sugars) for their growth and development.

* While some other organisms, like algae, also have chloroplasts, they are primarily associated with green plants.

Let me know if you have any more questions!