Final answer:
The organelle only present in plant cells and not in animal cells is the chloroplast. It is responsible for photosynthesis.
Step-by-step explanation:
The organelle that is only present in plant cells and not in animal cells is the chloroplast. Chloroplasts are responsible for the process of photosynthesis, which allows plants to convert sunlight into energy. Animal cells do not have chloroplasts because they obtain energy through other means, such as consuming food.
Learn more about Plant cells vs. animal cells