Explain why the chloroplasts of ALL photosynthetic eukaryoti

Explain why the chloroplasts of ALL photosynthetic eukaryotic organisms can be traced to a single common ancestor, whereas photsynthetic eukaryotes are polyphyletic -- support your explanation with details/example(s)/evidence.

In other words, How and Why do unrealated organisms have chloroplasts?

Thank you for your help!

Solution

.All photosynthesis in green plants and algae occur in chloroplasts.Captured cyanobacterium in photosynthesis remais occurn in chloroplastsPhotosynthesis has two main reactions. Light-dependent reactions - which need light to work - and light-independent reactions - which do not need light to work .Plants observe the light and its helpful in photosynthedsis process. this is called light reactions.plants which do not use light is called light independent reactions