Final answer:
Chloroplasts are essential organelles where photosynthesis occurs in plants and algae, containing stacked thylakoids with chlorophyll.
Explanation:
Chloroplasts are the organelles where the process of photosynthesis takes place in plants and algae. They have a double membrane envelope composed of an outer and inner membrane, and within them are stacked thylakoids containing chlorophyll, which initiates photosynthesis.
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