Answer:
The correct answer is- photoheterotroph
Explanation:
Photoheterotrops are the organisms that get their energy from sunlight but they take their nutrient or carbon source from the organic compounds like from other plants and animals. Carbon dioxide is not used by them as their source of energy.
Some of the examples of photoheterotroph are purple non-sulfur bacteria, green non-sulfur bacteria, etc. Therefore here the organism which was thought to be photoautotrophs acquire nutrients from dead plants material therefore they are actually photoheterotrophs.